CN109894117A - A kind of Co-Al@C composite catalyst and its synthetic method and application - Google Patents
A kind of Co-Al@C composite catalyst and its synthetic method and application Download PDFInfo
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- CN109894117A CN109894117A CN201910226837.0A CN201910226837A CN109894117A CN 109894117 A CN109894117 A CN 109894117A CN 201910226837 A CN201910226837 A CN 201910226837A CN 109894117 A CN109894117 A CN 109894117A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
A kind of Co-Al@C composite catalyst and its synthetic method and application, it is assembled in the solution using high molecular surfactant P123, citric acid, cobalt ions, aluminium ion, form lysotropic liquid crystal, P123 is used as carbon source and soft template simultaneously, after solvent evaporating completely, high-temperature calcination, the carbon material of organic bilayer conversion layered, cobalt and aluminium compound generate simultaneously in carbonisation, corroded using sodium hydroxide solution, a large amount of aluminium is removed, the layer structure closely arranged is lifted off of, to obtain Co-Al C composite carbon nanometer sheet material.When Co-Al@C composite catalyst prepared by the present invention is applied in ammonia decomposition reaction, it is active high, stability is good, cobalt granule size uniformity in catalyst, it is densely embedded in aluminium and carbon composite nano piece, the effective aggregation for preventing cobalt granule in ammonia decomposition reaction, improves catalytic performance of the catalyst when being catalyzed ammonolysis craft.
Description
Technical field
The present invention relates to the preparation and application of composite catalyst, and in particular to a kind of Co-Al@C composite catalyst and its conjunction
At method and application.
Background technique
With the continuous development of human society and industry, energy shortage and problem of environmental pollution are increasingly severe, new energy
Development and utilization are the inevitable choices of the mankind.In numerous new energies, Hydrogen Energy has cleaning, height as a kind of secondary energy sources
The advantages that effect.In Hydrogen Energy conversion aspect, hydrogen fuel cell is a kind of important way for realizing hydrogen utilization.In terms of hydrogen source,
Directly no matter all there are problems in terms of the transport or in terms of storage using hydrogen as fuel, and the online hydrogen producing technology of ammonolysis craft
Not only can hydrogen manufacturing but also can hydrogen storage, kill two birds with one stone.Ammonia is a kind of hydrogen-rich compound, and amino molecule not carbon elements will not generate COxEqual gas
There is " intoxicating phenomenon " in body, the electrode that hydrogen fuel cell is avoided from source.It is mesh that ammonia decomposition reaction, which is used for online hydrogen manufacturing,
Preceding one of the effective way for solving fuel cell hydrogen source, and be to prepare one kind inexpensively by the key that ammonolysis craft is used for online hydrogen manufacturing
It is easy to get, the catalyst of efficient stable.
Transition metal is the important catalyst in ammonia decomposition reaction, but is limited to that number of active sites is low, structural stability
The defects of poor, catalytic performance are unsatisfactory.In recent years, researchers pass through composition, structure and the preparation side to catalyst
Method carries out rational modification to improve the performance of transition-metal catalyst.For example, by by transition metal nanosizing to improve activity
The number in site；Reinforce the structural stability of catalyst on carrier by being carried on the transition metal particles of nanosizing.
Carbon has good thermal stability and electric conductivity, and in many catalysis and the application of energy storage material, carbon-based material is logical
It is commonly used for carrier and carrys out supported active species, in order to which the dispersion of active specy and electronics turn between carrier and active specy
It moves.In recent years, researchers are studied by the ammonia decomposition catalyzer of carrier of carbon, the results showed that, it is multiple with carbon material
The transition-metal catalyst (transition metal@C) of conjunction has a good application prospect catalysis preparing hydrogen by ammonia decomposition.
Preparing transition metal@C composite is generally divided into two-step method at present, i.e., prepares carbon-based supports, then first with chemistry
Transition metal is carried on carbon-based supports surface by sedimentation or infusion process.In order to control active component particles in lesser ruler
In very little range, generally requires to reduce load capacity, cause active component content limited.In addition, transition metal by Van der Waals force with
Machine loads on the carbon carrier, and since this absorption is not strong enough, reunion, obscission, shadow are easy to appear in catalytic reaction process
Ring the catalytic activity and stability of catalyst.
Summary of the invention
As the first aspect of the invention, a kind of synthetic method of Co-Al@C composite catalyst, including step are provided
It is rapid:
S1: P123 is dissolved in ethyl alcohol, and citric acid, nine water aluminum nitrates, cobalt nitrate hexahydrate is added, stirring to being completely dissolved,
Obtain mixed solution；
S2: mixed solution is transferred to solvent evaporated in baking oven, obtains presoma；
S3: presoma is calcined in protective atmosphere high temperature, obtains black solid；
S4: black solid is dissolved in aqueous slkali, and stirring washs later, is drying to obtain Co-Al@C composite catalyst.
Preferably, P123 is 2.00g in step S1, and the dehydrated alcohol is 40mL, and the citric acid is 1.68g, nitric acid
The integral molar quantity of aluminium and cobalt nitrate is 40mmol, and the mass ratio of cobalt nitrate hexahydrate and nine water aluminum nitrates is 1-8:10.
Preferably, in step S1, the molar feed ratio of Co and Al are 3:7.
Preferably, step S3 is specifically included: presoma being transferred in tube furnace, leads to high pure nitrogen, with 1 DEG C of min–1's
Heating rate rises to 400 DEG C from room temperature, is kept for 6 hours later, obtains black solid.
Preferably, step S4 is specifically included: black solid is dissolved in 200mL 2.5mol L–1NaOH solution in, stirring
At least for 24 hours, mother liquor is transferred in the centrifuge tube of 6 50mL, is washed 5 times, it is multiple to obtain target product Co-Al@C for 60 DEG C of drying
Close catalyst.
As the second aspect of the invention, the Co-Al@C composite catalyst of above method preparation is provided.
As the third aspect of the invention, provides above-mentioned Co-Al@C composite catalyst and made online in catalysis ammonolysis craft
Application in hydrogen.
Compared with prior art, beneficial effects of the present invention:
Synthetic method of the invention, using the method for fabricated in situ, the method is easy to operate, and repetitive rate is high；
Co-Al@C composite catalyst prepared by the present invention catalytic activity in ammonia decomposition reaction is high, and catalytic stability is good, can
It is recycled for multiple times；Cobalt granule size uniformity in catalyst is densely embedded in aluminium and carbon composite nano piece, effective to prevent
Aggregation of the cobalt granule in ammonia decomposition reaction improves catalytic performance of the catalyst when being catalyzed ammonolysis craft.
Detailed description of the invention
Fig. 1 is the Raman spectrum for the Co-Al@C composite catalyst that embodiment 2-4 is prepared respectively；
Fig. 2 is the SEM (a, b) and TEM (c) photo of 30Co-Al@C composite catalyst prepared by embodiment 3；
Fig. 3 is the constituency the STEM-EDS distribution diagram of element of 30Co-Al@C composite catalyst prepared by embodiment 3；
Fig. 4 is the XRD diagram of 30Co-Al@C composite catalyst prepared by embodiment 3.
Specific embodiment:
Embodiment 1
The synthesis of Co-Al@C composite catalyst:
Using high molecular surfactant as template, by solvent evaporation, high-temperature calcination, highly basic removing and etc. obtain target
Product Co-Al@C composite catalyst.In this engineering, transition metals cobalt and carbon generate simultaneously.Utilize high-molecular surface active
Agent P123, citric acid, cobalt ions, aluminium ion assemble in the solution, form lysotropic liquid crystal, and P123 is used as carbon source and soft mode simultaneously
Plate, after solvent evaporating completely, high-temperature calcination, the carbon material of organic bilayer conversion layered, cobalt and aluminium compound are in carbon
It is generated simultaneously during changing, is corroded using sodium hydroxide solution, remove a large amount of aluminium, the layer structure closely arranged is stripped
It opens, to obtain Co-Al C composite carbon nanometer sheet material.It specifically includes: 2.00g P123 is dissolved in 40mL dehydrated alcohol, be added
1.68g citric acid, a certain proportion of nine water aluminum nitrate and cobalt nitrate hexahydrate, the integral molar quantity of metal nitrate are 40mmol, cobalt
The ratio corresponding change of aluminium stirs 5 hours, and 60 DEG C of drying, obtained xerogel is transferred to tube furnace, leads to high pure nitrogen, from
Room temperature is with 1 DEG C of min–1Heating rate rise to 400 DEG C, kept for 6 hours.Obtained black solid is dissolved in 200mL 2.5mol L–1NaOH solution in, stirring at least for 24 hours, mother liquor is transferred in the centrifuge tube of 6 50mL, wash 5 times, 60 DEG C drying, obtain
Target product Co-Al@C composite catalyst.
It is catalyzed preparing hydrogen by ammonia decomposition process:
The sample for weighing 50mg20-40 mesh is placed in quartz tube reactor, and reactor is placed in heating furnace, passes through quality stream
Meter controls high-purity ammon gas velocity between 10-65mL/min, after ammonia enters reactor, by catalyst layer, reacts,
NH after reaction3And N2Concentration utilizes gas chromatograph on-line checking, and test temperature is from 350 DEG C to 600 DEG C, every 50 DEG C of points,
Each temperature spot keeps 60min to reach stable state.
Embodiment 2
The preparation of 15Co-Al@C composite catalyst:
The P123 of precise 2g is added 40mL dehydrated alcohol, is put into draught cupboard, magnetic agitation to being completely dissolved, with
Above-mentioned solution is added in precise 1.681g citric acid, 1.746g cobalt nitrate hexahydrate, nine water aluminum nitrate of 12.754g afterwards, and use is fresh-keeping
Film seals beaker mouth, removes preservative film after 5 hours are stirred at room temperature, and open beaker is transferred to 60 DEG C of baking oven
In, it is taken out after 48h, obtained presoma is transferred in tube furnace, leads to high pure nitrogen, from room temperature with 1 DEG C of min–1Heating rate
400 DEG C are risen to, is kept for 6 hours.Obtained black solid is dissolved in 200mL 2.5mol L–1NaOH solution in, at room temperature acutely
Stirring at least for 24 hours after, mother liquor is transferred in the centrifuge tube of 6 50mL, is washed with deionized 5 times, then in 60 DEG C of baking
It is dried overnight in case, obtains the compound ammonia decomposition catalyzer of 15Co-Al@C, Raman spectrum is as shown in Figure 1.
Catalysis experiments:
The above-mentioned catalyst of precise 50mg 20-40 purpose is placed in fixed bed quartz tube reactor, and reactor, which is put into, to be added
In hot stove, 600 DEG C are risen to by 350 DEG C using temperature programmed control technical controlling furnace temp, every 50 DEG C of holding 60min to reach
Stable state, controlling high-purity ammon gas velocity by mass flowmenter is 20.0mL/min, the NH after reaction3And N2Concentration utilizes gas phase color
Spectrometer on-line checking, temperature collection is from 350 DEG C to 600 DEG C, every 50 DEG C of acquisitions, one point.350 DEG C of conversion ratios are 5.6%, 400
DEG C conversion ratio is 17.7%, and 450 DEG C of conversion ratios are 41.3%, and 500 DEG C of conversion ratios are 74.0%, and 550 DEG C of conversion ratios are 97.0%,
600 DEG C of conversion ratios are 100.0%.
Embodiment 3
The preparation of 30Co-Al@C composite catalyst:
The present embodiment the difference from embodiment 1 is that, the cobalt nitrate hexahydrate quality of addition is 3.492g, nine water nitric acid aluminums
Amount is 10.504g.The Raman spectrum of prepared 30Co-Al@C catalyst as shown in Figure 1, SEM and TEM photo as shown in Fig. 2,
The constituency STEM-EDS distribution diagram of element is as shown in figure 3, XRD is as shown in Figure 4.
Catalysis experiments:
Take the 30Co-Al@C catalyst prepared in the present embodiment to carry out Catalysis experiments, the operating process of experiment, material use
Amount is with embodiment 1, but it should be recognized that 350 DEG C of conversion ratios are 6.3% in the present embodiment after Catalysis experiments, 400 DEG C turn
Rate is 20.4%, and 450 DEG C of conversion ratios are 46.1%, and 500 DEG C of conversion ratios are 90.1%, and 550 DEG C of conversion ratios are 99.9%, 600
DEG C conversion ratio is 100.0%.
Embodiment 4
The preparation of 50Co-Al@C composite catalyst:
The present embodiment the difference from embodiment 1 is that, the cobalt nitrate hexahydrate quality of addition is 5.821g, nine water nitric acid aluminums
Amount is 7.503g.The Raman spectrum of prepared 50Co-Al@C catalyst is as shown in Figure 1.
Catalysis experiments:
Take the 50Co-Al@C catalyst prepared in the present embodiment to carry out Catalysis experiments, the operating process of experiment, material use
Amount is with embodiment 1, but it should be recognized that 350 DEG C of conversion ratios are 5.2% in the present embodiment after Catalysis experiments, 400 DEG C turn
Rate is 15.4%, and 450 DEG C of conversion ratios are 34.5%, and 500 DEG C of conversion ratios are 59.2%, and 550 DEG C of conversion ratios are 91.9%, 600
DEG C conversion ratio is 99.4%.
Embodiment 5
30Co-Al the C catalyst of precise 50mg20-40 mesh is placed in fixed bed quartz tube reactor, and reactor is put
Enter in heating furnace, rise to 600 DEG C by 350 DEG C using temperature programmed control technical controlling furnace temp, every 50 DEG C of holding 60min with
Reach stable state, controlling high-purity ammon gas velocity by mass flowmenter is 10.0mL/min, the NH after reaction3And N2Concentration utilizes gas
Chromatography on-line checking, temperature collection is from 350 DEG C to 600 DEG C, every 50 DEG C of acquisitions, one point.350 DEG C of conversion ratios are
8.1%, 400 DEG C of conversion ratios are 25.2%, and 450 DEG C of conversion ratios are 56.7%, and 500 DEG C of conversion ratios are 97.0%, 550 DEG C of conversion ratios
It is 99.6%, 600 DEG C of conversion ratios are 100.0%.
Embodiment 6
30Co-Al the C catalyst of precise 50mg20-40 mesh is placed in fixed bed quartz tube reactor, and reactor is put
Enter in heating furnace, rise to 600 DEG C by 350 DEG C using temperature programmed control technical controlling furnace temp, every 50 DEG C of holding 60min with
Reach stable state, controlling high-purity ammon gas velocity by mass flowmenter is 38.3mL/min, the NH after reaction3And N2Concentration utilizes gas
Chromatography on-line checking, temperature collection is from 350 DEG C to 600 DEG C, every 50 DEG C of acquisitions, one point.350 DEG C of conversion ratios are
3.9%, 400 DEG C of conversion ratios are 13.3%, and 450 DEG C of conversion ratios are 32.2%, and 500 DEG C of conversion ratios are 59.9%, 550 DEG C of conversion ratios
It is 92.2%, 600 DEG C of conversion ratios are 99.6%.
Embodiment 7
30Co-Al the C catalyst of precise 50mg20-40 mesh is placed in fixed bed quartz tube reactor, and reactor is put
Enter in heating furnace, rise to 600 DEG C by 350 DEG C using temperature programmed control technical controlling furnace temp, every 50 DEG C of holding 60min with
Reach stable state, controlling high-purity ammon gas velocity by mass flowmenter is 63.3mL/min, the NH after reaction3And N2Concentration utilizes gas
Chromatography on-line checking, temperature collection is from 350 DEG C to 600 DEG C, every 50 DEG C of acquisitions, one point.350 DEG C of conversion ratios are
3.9%, 400 DEG C of conversion ratios are 13.3%, and 450 DEG C of conversion ratios are 32.2%, and 500 DEG C of conversion ratios are 59.9%, 550 DEG C of conversion ratios
It is 92.2%, 600 DEG C of conversion ratios are 99.6%.
Embodiment 8
30Co-Al the C catalyst of precise 50mg20-40 mesh is placed in fixed bed quartz tube reactor, and reactor is put
Enter in heating furnace, controlling high-purity ammon gas velocity by mass flowmenter is 38.3mL/min, and temperature of reactor is kept at 500 DEG C
48h then improves to 600 DEG C of holding 48h, temperature is again lowered to 500 DEG C later, 48h kept, within the entire reaction time
Continuous acquisition conversion data, conversion ratio have no reduction within the testing time of 144h, and it is very excellent to illustrate that the catalyst has
Catalytic stability.
Claims (7)
1. a kind of synthetic method of Co-Al@C composite catalyst, which is characterized in that comprising steps of
S1: P123 is dissolved in ethyl alcohol, and citric acid, nine water aluminum nitrates, cobalt nitrate hexahydrate is added, and is stirred to being completely dissolved, is obtained mixed
Close solution；
S2: mixed solution is transferred to solvent evaporated in baking oven, obtains presoma；
S3: presoma is calcined in protective atmosphere high temperature, obtains black solid.
S4: black solid is dissolved in aqueous slkali, and stirring washs later, is drying to obtain Co-Al@C composite catalyst.
2. a kind of synthetic method of Co-Al@C composite catalyst according to claim 1, which is characterized in that the step
P123 is 2.00g in S1, and the dehydrated alcohol is 40mL, and the citric acid is 1.68g, the integral molar quantity of aluminum nitrate and cobalt nitrate
For 40mmol, the mass ratio of cobalt nitrate hexahydrate and nine water aluminum nitrates is 1-8:10.
3. a kind of synthetic method of Co-Al@C composite catalyst according to claim 2, which is characterized in that the step
In S1, the molar feed ratio of Co and Al are 3:7.
4. a kind of synthetic method of Co-Al@C composite catalyst according to claim 1, which is characterized in that the step
S3 is specifically included: presoma being transferred in tube furnace, leads to high pure nitrogen, with 1 DEG C of min–1Heating rate rise to 400 from room temperature
DEG C, it is kept for 6 hours later, obtains black solid.
5. a kind of synthetic method of Co-Al@C composite catalyst according to claim 1, which is characterized in that the step
S4 is specifically included: black solid is dissolved in 200mL2.5mol L–1NaOH solution in, stirring at least for 24 hours, mother liquor is transferred to 6
It in the centrifuge tube of a 50mL, washes 5 times, 60 DEG C of drying obtain target product Co-Al@C composite catalyst.
6. Co-Al@C the composite catalyst of the preparation of the method as described in any of the above-described claim.
7. application of Co-Al@C composite catalyst described in claim 6 in the catalysis online hydrogen manufacturing of ammonolysis craft.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115501878A (en) * | 2022-09-29 | 2022-12-23 | 中国科学院青岛生物能源与过程研究所 | Method for synthesizing niobium-cobalt catalyst by in-situ centrifugation and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115501878A (en) * | 2022-09-29 | 2022-12-23 | 中国科学院青岛生物能源与过程研究所 | Method for synthesizing niobium-cobalt catalyst by in-situ centrifugation and application |
| CN115501878B (en) * | 2022-09-29 | 2023-07-25 | 中国科学院青岛生物能源与过程研究所 | Method for synthesizing niobium-cobalt catalyst by in-situ centrifugation and application thereof |
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Application publication date: 20190618 |