CN110508313A - With the method for Ag-Pd nanometer sheet catalyst visible light catalytic formate dehydrogenase - Google Patents
With the method for Ag-Pd nanometer sheet catalyst visible light catalytic formate dehydrogenase Download PDFInfo
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- CN110508313A CN110508313A CN201910835127.8A CN201910835127A CN110508313A CN 110508313 A CN110508313 A CN 110508313A CN 201910835127 A CN201910835127 A CN 201910835127A CN 110508313 A CN110508313 A CN 110508313A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 23
- 108090000698 Formate Dehydrogenases Proteins 0.000 title claims abstract description 11
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 50
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 25
- 235000019253 formic acid Nutrition 0.000 claims abstract description 25
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000001257 hydrogen Substances 0.000 claims abstract description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004280 Sodium formate Substances 0.000 claims abstract description 15
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 claims abstract description 15
- 235000019254 sodium formate Nutrition 0.000 claims abstract description 15
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 4
- 229910052709 silver Inorganic materials 0.000 claims abstract description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 41
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 30
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 28
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 15
- 229920000877 Melamine resin Polymers 0.000 claims description 14
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 14
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 claims description 14
- 239000012279 sodium borohydride Substances 0.000 claims description 14
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- 239000012298 atmosphere Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 238000004108 freeze drying Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000010129 solution processing Methods 0.000 claims description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 1
- 239000000460 chlorine Substances 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 claims 1
- 238000006356 dehydrogenation reaction Methods 0.000 abstract description 10
- 238000003889 chemical engineering Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 2
- 238000007146 photocatalysis Methods 0.000 abstract description 2
- 150000002431 hydrogen Chemical class 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- 238000004321 preservation Methods 0.000 description 6
- 239000012495 reaction gas Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 239000012300 argon atmosphere Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229960004424 carbon dioxide Drugs 0.000 description 2
- 239000012876 carrier material Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004177 carbon cycle Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007357 dehydrogenase reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- B01J35/39—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/16—Reducing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/22—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of gaseous or liquid organic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0266—Processes for making hydrogen or synthesis gas containing a decomposition step
- C01B2203/0277—Processes for making hydrogen or synthesis gas containing a decomposition step containing a catalytic decomposition step
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/10—Catalysts for performing the hydrogen forming reactions
- C01B2203/1041—Composition of the catalyst
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/10—Catalysts for performing the hydrogen forming reactions
- C01B2203/1041—Composition of the catalyst
- C01B2203/1082—Composition of support materials
Abstract
The invention discloses a kind of methods with Ag-Pd nanometer sheet catalyst visible light catalytic formate dehydrogenase, belong to technical field of chemistry and chemical engineering.The nanometer sheet catalyst prepared is placed in jacketed reactor by the present invention, it is controlled and is reacted by constant temperature circulating slot, it will be seen that light irradiates reaction solution above jacketed reactor, then formic acid and sodium formate mixed liquor are added in reactor and reacted, the hydrogen of generation is collected using drainage.Unlike traditional loaded catalyst: according to the present invention, adjusting metallic silver, the content of palladium and Mxene-TiO in catalyst2The high activity for photocatalysis formate dehydrogenase hydrogen, highly selective loaded nano piece catalyst can be made in content.The reaction of visible light formate dehydrogenase is carried out using the catalyst, conversion rate of dehydrogenation and selectivity are 100%, and the TOF value of reaction is greater than 780h‑1, 8h is recycled, the TOF value of reaction is still greater than 764h‑1。
Description
Technical field
The invention belongs to technical field of chemistry and chemical engineering, and in particular to use Ag-Pd/TiO2@g-C3N4Nanometer sheet catalyst is visible
The method of photocatalysis formate dehydrogenase.
Background technique
As economy develops rapidly, people can demand to the energy it is also growing day by day, traditional fossil energy is opened on a large scale
It adopts, environmental problem and energy crisis caused by reserves are limited and its large-scale use, developing clean green energy resource is the mankind
Realize the only way of sustainable development.Currently, density and environmental-friendly advantage of the hydrogen fuel cell because of its unique energy,
Extensive concern by researcher.Developing efficient hydrogen storage material is the key that promote hydrogen fuel cell large-scale application.
Formic acid mass energy density with higher (4.4wt%), reaction condition is mild, it can be achieved that carbon cycle, and in room
It is in a liquid state under temperature, safely can store and transport.There are mainly two types of approach for formic acid decomposition at present: the production that approach one decomposes completely
Object only has hydrogen and carbon dioxide, without other by-products；Two incomplete decomposing of approach generation water and carbon monoxide, the one of generation
Carbonoxide easily causes the poisoning of dehydrogenation and fuel-cell catalyst.Therefore, efficient formate dehydrogenase catalyst pair is developed
Hydrogen using most important.
Summary of the invention
Ag-Pd/Mxene-TiO is used in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of2@g-C3N4Nanometer
Milder item can be achieved in the method for piece catalyst visible light catalytic formate dehydrogenase, the nanometer sheet catalyst under the action of visible light
The complete dehydrogenation of formic acid under part, the catalyst have good catalytic activity, selectivity and stability.
The technical solution adopted by the present invention to solve the technical problems is as follows.
By Ag-Pd/Mxene-TiO2@g-C3N4Nanometer sheet catalyst is placed in jacketed reactor, passes through constant temperature circulating slot control
System reaction is carried out at 20~50 DEG C, and wavelength X > 400nm visible light is irradiated reaction solution above jacketed reactor, will then be rubbed
You than be 1:(0.5~1.5) formic acid and sodium formate mixed liquor be added reactor in reacted, obtain hydrogen product.It is described
Nanometer sheet catalyst and formic acid and sodium formate mixed liquor mass ratio be 1:(20~60).
The Ag-Pd/Mxene-TiO2@g-C3N4Nanometer sheet catalyst includes Ag, Pd, Mxene-TiO2And g-C3N4It receives
Rice piece, wherein Ag derives from silver nitrate, and Pd derives from palladium chloride, Mxene-TiO2From Mxene-Ti2AlC, g-C3N4It receives
Rice piece is roasted by melamine and lithium chloride and is made.
The Ag-Pd/Mxene-TiO2@g-C3N4Nanometer sheet catalyst is through the following steps that prepared:
(1) after melamine and lithium chloride being roasted under certain roasting condition and atmosphere by a certain percentage, then certain
At a temperature of wash a period of time, filtering obtains g-C3N4Nanometer sheet；
The mass ratio of the melamine and lithium chloride is 1:(3~6)；Maturing temperature is 500~550 DEG C, calcining time 2
~6h, atmosphere are nitrogen or argon gas, and 20~60 DEG C of washing temperature, washing time is 36~48h.
(2) a certain amount of Ti is taken2AlC, freezing is dry after being added into certain density hydrofluoric acid solution processing a period of time
It is dry to get arrive Ti2C；
The mass concentration of the HF is 30~60wt%, handles 2.0~5.0h of time.
(3) by Ti2C and g-C3N4Nanometer sheet is placed in the hydrothermal synthesis kettle of the deionized water containing 40ml by certain mol proportion, is added
Certain density NaHSO3Solution, ultrasonic disperse for a period of time, place it in hydrothermal synthesis under certain temperature and for a period of time, filter
After washing, freeze-drying obtains Mxene-TiO2@g-C3N4Nanometer sheet carrier；
The Ti2C and g-C3N4The molar ratio of nanometer sheet is 1:(30~45), NaHSO3Concentration is 0.02~0.05mol/
L, hydrothermal synthesis temperature are 130~170 DEG C, and the hydrothermal synthesis time is 6~9h.
(4) the porous Mxene-TiO for obtaining freeze-drying2@g-C3N4Nanometer sheet carrier is placed in the silver nitrate of definite composition
And palladium chloride solution, at a certain temperature using sodium borohydride solution reduction a period of time, centrifugal drying obtains Ag-Pd/
Mxene-TiO2@g-C3N4Nanometer sheet catalyst；
The silver nitrate, palladium chloride and Mxene-TiO2@g-C3N4The molar ratio of nanometer sheet is 1:(0.2~0.4): (15~
24), sodium borohydride concentration is 0.05~0.09mol/L, and reduction temperature is 1~4 DEG C, and the recovery time is 4~7h.
Further, the mass ratio of the melamine and lithium chloride is 1:6；Maturing temperature is 550 DEG C, calcining time
2h, atmosphere are argon gas, 60 DEG C of washing temperature, washing time 36h；The mass concentration of the HF is 60wt%, handles the time
2.0h；The Ti2C and g-C3N4The molar ratio of nanometer sheet is 1:45, NaHSO3Concentration is 0.05mol/L, and hydrothermal synthesis temperature is
170 DEG C, the hydrothermal synthesis time is 6h；The silver nitrate, palladium chloride and Mxene-TiO2@g-C3N4The molar ratio of nanometer sheet is 1:
0.4:24, sodium borohydride concentration are 0.09mol/L, and reduction temperature is 4 DEG C, recovery time 4h；The nanometer sheet catalyst
It is 1:60 with formic acid and sodium formate mixed liquor mass ratio；The formic acid and sodium formate molar ratio are 1:1.5.At this point, being surveyed after reaction
The selectivity for obtaining hydrogen is 100%, and the conversion ratio of formic acid is 100%, and the TOF value of reaction is 1360h-1, 8h, reaction is recycled
TOF value be still greater than 1332h-1。
Compared with prior art, the beneficial effects of the present invention are:
1, the invention patent is with Mxene-Ti2AlC is the Mxene-TiO that precursor synthesis is rich in oxygen vacancy2, then pass through water
The Mxene-TiO of thermal synthesis polymolecularity2@g-C3N4Nanometer sheet carrier material, the Mxene-TiO2@g-C3N4Nanometer sheet carrier material
Material has good electron transmission performance and photoinduction performance, further uses immersion reduction method AgPd/Mxene-TiO2@g-
C3N4Nanometer sheet catalyst, the support type AgPd alloy that sodium borohydride reduction synthesizes under temperate condition, the reducing agent can realize AgPd
Alloy uniform load is on carrier.
2, the present invention uses immersion reduction method, uses salt Melting Synthesis g-C first3N4Nanometer sheet, then use hydrofluoric acid treatment
Ti2Ti made from AlC (Mxene)2C, by g-C3N4Nanometer sheet and Ti2Mxene-TiO is made in C hydrothermal treatment2@g-C3N4Nanometer
Piece, the porous Mxene-TiO that will be obtained2@g-C3N4Nanometer sheet is placed in the silver nitrate and palladium chloride solution of definite composition, certain
At a temperature of using sodium borohydride solution reduction a period of time, centrifugal drying obtains Ag-Pd/Mxene-TiO2@g-C3N4Nanometer
Piece catalyst, catalyst activity and selectivity with higher under visible light action.Visible light is carried out using the catalyst
It is catalyzed formate dehydrogenase reaction, is approached in reaction temperature and still shows good catalytic activity (20 DEG C), conversion rate of dehydrogenation at room temperature
It is 100% with selectivity, the TOF value of reaction is greater than 780h-1, 8h is recycled, the TOF value of reaction is still greater than 764h-1。
Specific implementation method
The present invention is described in further details below by embodiment.But the example is not constituted to limit of the invention
System.
Embodiment 1
Prepare catalyst process
By 3g melamine and the uniform ground and mixed of 9g lithium chloride, 500 DEG C of roasting 6h, mixed after roasting in a nitrogen atmosphere
It closes object and washes 48h, drying to obtain g-C at 20 DEG C3N4Nanometer sheet；Weigh 1gTi2When AlC is placed in the processing of 30wt%HF solution
Between 5.0h, filtering washing and drying obtain Ti2C；By 0.1mmolTi2C and 3mmol g-C3N4Nanometer sheet is placed in 40mL deionized water
In, NaHSO is added3, it is adjusted to NaHSO3Concentration is 0.02mol/L, and 130 DEG C of hydrothermal synthesis temperature, the hydrothermal synthesis time is 9h, is obtained
To (Mxene-TiO2)1/30@g-C3N4Nanometer sheet weighs 15mmol (Mxene-TiO2)1/30@g-C3N4Nanometer sheet is placed in and contains
In 1mmol silver nitrate and 0.2mmol palladium chloride solution, using the sodium borohydride solution of 0.05mol/L in 1 DEG C of reduction 7h, that is, make
Catalyst is obtained, AgPd is denoted as0.2/(Mxene-TiO2)1/30@g-C3N4Nanometer sheet catalyst, closed preservation.
Dehydrogenation reaction process
The above-mentioned catalyst of 50mg is filled in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 20 DEG C, it will
The visible light of certain power wavelength (λ > 400nm) irradiates reaction solution above jacketed reactor, injects and rubs into jacketed reactor
You collect reaction gas than the formic acid and sodium formate mixed liquor 1.0g that are 1:0.5, and the selectivity that hydrogen is measured after reaction is
100%, the conversion ratio of formic acid is 100%, and the TOF value of reaction is 820h-1, 8h is recycled, the TOF value of reaction is still greater than
815h-1。
Embodiment 2
Prepare catalyst process
By 3g melamine and the uniform ground and mixed of 18g lithium chloride, 550 DEG C of roasting 2h under an argon atmosphere, after roasting
Mixture washes 36h, drying to obtain g-C at 60 DEG C3N4Nanometer sheet；Weigh 1gTi2AlC is placed in the processing of 60wt%HF solution
Time 2.0h, filtering washing and drying obtain Ti2C；By 0.1mmolTi2C and 4.5mmol g-C3N4Nanometer sheet be placed in 40mL go from
In sub- water, NaHSO is added3, it is adjusted to NaHSO3Concentration is 0.05mol/L, and 170 DEG C of hydrothermal synthesis temperature, the hydrothermal synthesis time is
6h obtains (Mxene-TiO2)1/45@g-C3N4Nanometer sheet weighs 24mmol (Mxene-TiO2)1/45@g-C3N4Nanometer sheet is placed in
In silver nitrate containing 1mmol and 0.4mmol palladium chloride solution, using the sodium borohydride solution of 0.09mol/L in 4 DEG C of reduction 4h, i.e.,
Catalyst is made, is denoted as AgPd0.4/(Mxene-TiO2)1/45@g-C3N4Nanometer sheet catalyst, closed preservation.
Dehydrogenation reaction process
The above-mentioned catalyst of 50mg is filled in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 50 DEG C, it will
The visible light of certain power wavelength (λ > 400nm) irradiates reaction solution above jacketed reactor, injects and rubs into jacketed reactor
You collect reaction gas than the formic acid and sodium formate mixed liquor 3.0g that are 1:1.5, and the selectivity that hydrogen is measured after reaction is
100%, the conversion ratio of formic acid is 100%, and the TOF value of reaction is 1360h-1, 8h is recycled, the TOF value of reaction is still greater than
1332h-1。
Embodiment 3
Prepare catalyst process
By 3g melamine and the uniform ground and mixed of 12g lithium chloride, 540 DEG C of roasting 5h under an argon atmosphere, after roasting
Mixture washes 39h, drying to obtain g-C at 50 DEG C3N4Nanometer sheet；Weigh 1gTi2AlC is placed in the processing of 50wt%HF solution
Time 4.0h, filtering washing and drying obtain Ti2C；By 0.1mmolTi2C and 3.5mmol g-C3N4Nanometer sheet be placed in 40mL go from
In sub- water, NaHSO is added3, it is adjusted to NaHSO3Concentration is 0.04mol/L, and 160 DEG C of hydrothermal synthesis temperature, the hydrothermal synthesis time is
7h obtains (Mxene-TiO2)1/35@g-C3N4Nanometer sheet weighs 20mmol (Mxene-TiO2)1/35@g-C3N4Nanometer sheet is placed in
In silver nitrate containing 1mmol and 0.3mmol palladium chloride solution, using the sodium borohydride solution of 0.06mol/L in 3 DEG C of reduction 5h, i.e.,
Catalyst is made, is denoted as AgPd0.3/(Mxene-TiO2)1/35@g-C3N4Nanometer sheet catalyst, closed preservation.
Dehydrogenation reaction process
The above-mentioned catalyst of 50mg is filled in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 40 DEG C, it will
The visible light of certain power wavelength (λ > 400nm) irradiates reaction solution above jacketed reactor, injects and rubs into jacketed reactor
You collect reaction gas than the formic acid and sodium formate mixed liquor 2.0g that are 1:1.2, and the selectivity that hydrogen is measured after reaction is
100%, the conversion ratio of formic acid is 100%, and the TOF value of reaction is 1140h-1, 8h is recycled, the TOF value of reaction is still greater than
1112h-1。
Embodiment 4
Prepare catalyst process
By 3g melamine and the uniform ground and mixed of 15g lithium chloride, 530 DEG C of roasting 4h under an argon atmosphere, after roasting
Mixture washes 42h, drying to obtain g-C at 40 DEG C3N4Nanometer sheet；Weigh 1gTi2AlC is placed in the processing of 40wt%HF solution
Time 3.0h, filtering washing and drying obtain Ti2C；By 0.1mmolTi2C and 4.0mmol g-C3N4Nanometer sheet be placed in 40mL go from
In sub- water, NaHSO is added3, it is adjusted to NaHSO3Concentration is 0.03mol/L, and 150 DEG C of hydrothermal synthesis temperature, the hydrothermal synthesis time is
8h obtains (Mxene-TiO2)1/40@g-C3N4Nanometer sheet weighs 18mmol (Mxene-TiO2)1/40@g-C3N4Nanometer sheet is placed in
In silver nitrate containing 1mmol and 0.35mmol palladium chloride solution, using the sodium borohydride solution of 0.08mol/L in 2 DEG C of reduction 5.5h,
Catalyst is obtained, AgPd is denoted as0.35/(Mxene-TiO2)1/40@g-C3N4Nanometer sheet catalyst, closed preservation.
Dehydrogenation reaction process
The above-mentioned catalyst of 50mg is filled in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 30 DEG C, it will
The visible light of certain power wavelength (λ > 400nm) irradiates reaction solution above jacketed reactor, injects and rubs into jacketed reactor
You collect reaction gas than the formic acid and sodium formate mixed liquor 1.5g that are 1:0.8, and the selectivity that hydrogen is measured after reaction is
100%, the conversion ratio of formic acid is 100%, and the TOF value of reaction is 1060h-1, 8h is recycled, the TOF value of reaction is still greater than
1036h-1。
Embodiment 5
Prepare catalyst process
By 3g melamine and the uniform ground and mixed of 12g lithium chloride, 520 DEG C of roasting 5h in a nitrogen atmosphere, after roasting
Mixture washes 44h, drying to obtain g-C at 35 DEG C3N4Nanometer sheet；Weigh 1gTi2AlC is placed in the processing of 35wt%HF solution
Time 4.5h, filtering washing and drying obtain Ti2C；By 0.1mmolTi2C and 3.6mmol g-C3N4Nanometer sheet be placed in 40mL go from
In sub- water, NaHSO is added3, it is adjusted to NaHSO3Concentration is 0.025mol/L, and 140 DEG C of hydrothermal synthesis temperature, the hydrothermal synthesis time is
8.5h obtains (Mxene-TiO2)1/36@g-C3N4Nanometer sheet weighs 22mmol (Mxene-TiO2)1/36@g-C3N4Nanometer sheet is set
In silver nitrate containing 1mmol and 0.25mmol palladium chloride solution, restored using the sodium borohydride solution of 0.06mol/L at 2 DEG C
6.5h obtains catalyst, is denoted as AgPd0.25/(Mxene-TiO2)1/36@g-C3N4Nanometer sheet catalyst, closed preservation.
Dehydrogenation reaction process
The above-mentioned catalyst of 50mg is filled in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 35 DEG C, it will
The visible light of certain power wavelength (λ > 400nm) irradiates reaction solution above jacketed reactor, injects and rubs into jacketed reactor
You collect reaction gas than the formic acid and sodium formate mixed liquor 2.3g that are 1:1.3, and the selectivity that hydrogen is measured after reaction is
100%, the conversion ratio of formic acid is 100%, and the TOF value of reaction is 935h-1, 8h is recycled, the TOF value of reaction is still greater than
922h-1。
Embodiment 6
Prepare catalyst process
By 3g melamine and the uniform ground and mixed of 16g lithium chloride, 510 DEG C of roasting 3.5h in a nitrogen atmosphere, after roasting
Mixture 38h, drying to obtain g-C are washed at 45 DEG C3N4Nanometer sheet；Weigh 1gTi2AlC is placed at 55wt%HF solution
Time 3.5h is managed, filtering washing and drying obtains Ti2C；By 0.1mmolTi2C and 4.2mmol g-C3N4Nanometer sheet is placed in 40mL and goes
In ionized water, NaHSO is added3, it is adjusted to NaHSO3Concentration is 0.05mol/L, and 160 DEG C of hydrothermal synthesis temperature, the hydrothermal synthesis time is
7.5h obtains (Mxene-TiO2)1/42@g-C3N4Nanometer sheet weighs 22mmol (Mxene-TiO2)1/42@g-C3N4Nanometer sheet is set
In silver nitrate containing 1mmol and 0.3mmol palladium chloride solution, restored using the sodium borohydride solution of 0.07mol/L at 3 DEG C
4.5h obtains catalyst, is denoted as AgPd0.3/(Mxene-TiO2)1/42@g-C3N4Nanometer sheet catalyst, closed preservation.
Dehydrogenation reaction process
The above-mentioned catalyst of 50mg is filled in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 45 DEG C, it will
The visible light of certain power wavelength (λ > 400nm) irradiates reaction solution above jacketed reactor, injects and rubs into jacketed reactor
You collect reaction gas than the formic acid and sodium formate mixed liquor 2.8g that are 1:1.4, and the selectivity that hydrogen is measured after reaction is
100%, the conversion ratio of formic acid is 100%, and the TOF value of reaction is 1065h-1, 8h is recycled, the TOF value of reaction is still greater than
1052h-1。
Claims (2)
1. with the method for Ag-Pd nanometer sheet catalyst visible light catalytic formate dehydrogenase, it is characterised in that: by Ag-Pd/Mxene-
TiO2@g-C3N4Nanometer sheet catalyst is placed in jacketed reactor, is carried out by the control reaction of constant temperature circulating slot at 20~50 DEG C,
Wavelength X > 400nm visible light is irradiated into reaction solution above jacketed reactor, is then 1:(0.5~1.5 by molar ratio)
Formic acid and sodium formate mixed liquor, which are added in reactor, to be reacted, and hydrogen product is obtained；
The nanometer sheet catalyst and formic acid and sodium formate mixed liquor mass ratio are 1:(20~60)；
The Ag-Pd/Mxene-TiO2@g-C3N4Nanometer sheet catalyst includes Ag, Pd, Mxene-TiO2And g-C3N4Nanometer
Piece, wherein Ag derives from silver nitrate, and Pd derives from palladium chloride, Mxene-TiO2From Mxene-Ti2AlC, g-C3N4Nanometer
Piece is roasted by melamine and lithium chloride and is made；
The Ag-Pd/Mxene-TiO2@g-C3N4Nanometer sheet catalyst is through the following steps that prepared:
(1) after melamine and lithium chloride being roasted under certain roasting condition and atmosphere by a certain percentage, then in certain temperature
Lower washing a period of time, filtering obtain g-C3N4Nanometer sheet；
The mass ratio of the melamine and lithium chloride is 1:(3~6)；Maturing temperature is 500~550 DEG C, calcining time 2~
6h, atmosphere are nitrogen or argon gas, and 20~60 DEG C of washing temperature, washing time is 36~48h；
(2) a certain amount of Ti is taken2AlC is freeze-dried, i.e., after being added into certain density hydrofluoric acid solution processing a period of time
Obtain Ti2C；
The mass concentration of the HF is 30~60wt%, handles 2.0~5.0h of time；
(3) by Ti2C and g-C3N4Nanometer sheet is placed in the hydrothermal synthesis kettle of the deionized water containing 40ml by certain mol proportion, is added certain
The NaHSO of concentration3Solution, ultrasonic disperse for a period of time, placing it in hydrothermal synthesis under certain temperature, for a period of time, wash by filtering
Afterwards, freeze-drying obtains Mxene-TiO2@g-C3N4Nanometer sheet carrier；
The Ti2C and g-C3N4The molar ratio of nanometer sheet is 1:(30~45), NaHSO3Concentration is 0.02~0.05mol/L, hydro-thermal
Synthesis temperature is 130~170 DEG C, and the hydrothermal synthesis time is 6~9h；
(4) the porous Mxene-TiO for obtaining freeze-drying2@g-C3N4Nanometer sheet carrier is placed in the silver nitrate and chlorine of definite composition
Change palladium solution, at a certain temperature using sodium borohydride solution reduction a period of time, centrifugal drying obtains Ag-Pd/Mxene-
TiO2@g-C3N4Nanometer sheet catalyst；
The silver nitrate, palladium chloride and Mxene-TiO2@g-C3N4The molar ratio of nanometer sheet is 1:(0.2~0.4): (15~24),
Sodium borohydride concentration is 0.05~0.09mol/L, and reduction temperature is 1~4 DEG C, and the recovery time is 4~7h.
2. the method for using Ag-Pd nanometer sheet catalyst visible light catalytic formate dehydrogenase as described in claim 1, feature exist
In:
The mass ratio of the melamine and lithium chloride is 1:6；Maturing temperature is 550 DEG C, and calcining time 2h, atmosphere is argon gas,
60 DEG C of washing temperature, washing time 36h；
The mass concentration of the HF is 60wt%, handles time 2.0h；
The Ti2C and g-C3N4The molar ratio of nanometer sheet is 1:45, NaHSO3Concentration is 0.05mol/L, and hydrothermal synthesis temperature is
170 DEG C, the hydrothermal synthesis time is 6h；
The silver nitrate, palladium chloride and Mxene-TiO2@g-C3N4The molar ratio of nanometer sheet is 1:0.4:24, sodium borohydride concentration
For 0.09mol/L, reduction temperature is 4 DEG C, recovery time 4h；
The nanometer sheet catalyst and formic acid and sodium formate mixed liquor mass ratio are 1:60；The formic acid and sodium formate molar ratio
For 1:1.5.
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| CN111185213A (en) * | 2020-01-07 | 2020-05-22 | 吉首大学 | All solid state (TiO)2-Ag)/GR/C3N4Composite nano fiber photocatalysis material, preparation method and application |
| CN111330610A (en) * | 2020-04-10 | 2020-06-26 | 合肥工业大学 | Silver nanoflower/Ti3C2TxPreparation method and application of composite material |
| CN113097516A (en) * | 2021-04-09 | 2021-07-09 | 浙江大学 | Noble metal @ Pd epitaxial heterostructure electrocatalyst and preparation method and application thereof |
| CN115463654A (en) * | 2022-08-31 | 2022-12-13 | 广东工业大学 | Pd-Ag loaded g-C3N4 nanosheet photocatalyst as well as preparation method and application thereof |
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| CN111185213A (en) * | 2020-01-07 | 2020-05-22 | 吉首大学 | All solid state (TiO)2-Ag)/GR/C3N4Composite nano fiber photocatalysis material, preparation method and application |
| CN111330610A (en) * | 2020-04-10 | 2020-06-26 | 合肥工业大学 | Silver nanoflower/Ti3C2TxPreparation method and application of composite material |
| CN113097516A (en) * | 2021-04-09 | 2021-07-09 | 浙江大学 | Noble metal @ Pd epitaxial heterostructure electrocatalyst and preparation method and application thereof |
| CN113097516B (en) * | 2021-04-09 | 2022-11-29 | 浙江大学 | Noble metal @ Pd epitaxial heterostructure electrocatalyst and preparation method and application thereof |
| CN115463654A (en) * | 2022-08-31 | 2022-12-13 | 广东工业大学 | Pd-Ag loaded g-C3N4 nanosheet photocatalyst as well as preparation method and application thereof |
| CN115463654B (en) * | 2022-08-31 | 2024-02-20 | 广东工业大学 | Pd-Ag loaded g-C 3 N 4 Nanosheet photocatalyst, preparation method and application |
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