CN106513028A - Catalyst, preparation method thereof and application in reducing nitryl compound - Google Patents
Catalyst, preparation method thereof and application in reducing nitryl compound Download PDFInfo
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- CN106513028A CN106513028A CN201610969457.2A CN201610969457A CN106513028A CN 106513028 A CN106513028 A CN 106513028A CN 201610969457 A CN201610969457 A CN 201610969457A CN 106513028 A CN106513028 A CN 106513028A
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- catalyst
- nitrogen
- carbon material
- doped carbon
- nitro compound
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- 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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/30—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds
- C07C209/32—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups
- C07C209/36—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of nitrogen-to-oxygen or nitrogen-to-nitrogen bonds by reduction of nitro groups by reduction of nitro groups bound to carbon atoms of six-membered aromatic rings in presence of hydrogen-containing gases and a catalyst
Abstract
The invention belongs to the technical field of a catalyst, and particularly relates to a catalyst, a preparation method of the catalyst and an application in catalytic reduction of nitryl compound to prepare amine compound; the catalyst takes cobalt peptide cyanine as a precursor and SiO2 as a hard template, and is obtained by high-temperature pyrolysis under nitrogen protection; the catalyst can be applied to perform catalytic hydrogenation and reduction on nitryl compound under the gentle condition, and also applied to catalyzing the other hydrogen resources such as CO/H2O, normal butanol, isopropyl alcohol, benzyl alcohol, formic acid and others. The catalyst preparation method is simple, and the catalyst stability is good and can be recycled for over 16 times; the catalyst has good industrial application prospect.
Description
Technical field
The invention belongs to catalyst technical field, and in particular to a kind of catalyst and preparation method thereof, and its in reduction nitre
Application in base class compound.
Background technology
Aminated compoundss (mainly aniline) are a kind of important industrial chemicals and fine-chemical intermediate, are widely used in
Dyestuff, medicine, explosive, spice, the industry such as thiofide and special type function material.It is industrial at present mainly to pass through nitro
Prepared by class compound (mainly Nitrobenzol) hydrogenation method, reaction generally needs higher temperature and elevated pressures, easily causes reactor
Hot-spot, it is high to equipment requirements, and the potential safety hazard of production process is big.So exploitation aminated compoundss (mainly aniline) is new
Synthesis technique and technology industrially have and have significant practical applications.
Nitro compound (mainly Nitrobenzol) hydrogenation is main at present is catalyzed by noble metal catalyst, or is needed in height
Carry out under warm high pressure.For example：Matthias Beller etc. prepare amine by hydrogen source of hydrogen using base metal Co catalyst
Compound (mainly aniline), under the pressure of 50bar, 4 hours conversion ratios and selectivity reach 100% [Nature
Chemistry [J], 2013,5,537-543.].Yongquan Qu etc. use precious metals pd catalyst reduction nitro compound
(mainly Nitrobenzol), the method can be in 5bar H2Under carry out, 2h conversion ratios and selectivity reach 100% [Joumal of
The American Chemical Society [J], 2016,138,2629-37.].
However, the major part in nitro compound (mainly Nitrobenzol) method for preparing disclosed in prior art is all used
Noble metal catalyst, and still require that higher Hydrogen Vapor Pressure, it is unfavorable for large-scale production.
The content of the invention
According to the deficiency that prior art is present, it is an object of the invention to provide a kind of base metal Co catalyst (CoN@CN)
And preparation method thereof and catalysis reduction nitro compound prepare the application in aminated compoundss.Wherein catalyst is load C o
Nitrogen-doped carbon material, abbreviation CoN@CN.
The present invention is adopted the following technical scheme that for achieving the above object：
The invention provides a kind of catalyst, the catalyst is nitrogen-doped carbon material load cobalt catalyst, with nitrogen-doped carbon
Material is skeleton, binding activity component on skeleton, and in catalyst, active component is CoNx, Co elements quality point in the catalyst
It is 0.18%-1% to count, and its X-ray diffraction (XRD) CoN occurs in 2 θ=43.7 °xCharacteristic peak (JCPDS No.41-0943).
The preparation method of above-mentioned nitrogen-doped carbon material load cobalt catalyst, comprises the following steps：
(1) by mass ratio for 1: 1-1: 20 tetranitro cobalt peptide cyanines (referred to as CoPc) and Ludox be added to N, N- diformazans
Base Methanamide (DMF) and H2Abundant, DMF and H in described mixed solvent is stirred in the mixed solvent of O2O volume ratios are 1: 1-1:
5；
(2) vacuum distillation removes solvent, obtains tetranitro cobalt peptide cyanines and SiO2Composite：CoPc/SiO2；
(3) CoPc/SiO that will be obtained in step (2)2High temperature pyrolysis under nitrogen protection, pyrolysis temperature are 600 DEG C -900
DEG C, calcination time is 2 hours；
(4) using 1wt%-20wt% aqueous hydrogen fluoride solution removal step (3) obtained by solid template SiO2And metal
State Co nanoparticle, is washed to centrifugal vacuum drying to obtain CoN@CN catalyst after neutrality.
Application of the above-mentioned nitrogen-doped carbon material load cobalt catalyst in reduction nitro compound, its step is：To urge
Agent, solvent, nitro compound proportionally 40mg: 5-16mL: 0.49-1mmol are added in reaction vessel, are filled with
1bar-20bar reproducibilities or protective gas, at 40-160 DEG C react 1-12h, obtain reduzate.
Described reducibility gas are hydrogen or carbon monoxide, and described protective gas is the nitrogen of anti-oxidation.
Described solvent is water, acetonitrile, ethanol, isopropanol, n-butyl alcohol, benzyl alcohol, toluene, dioxane, ethyl acetate
Or the one kind in limonene.
Described nitro compound is
Compared with prior art, the advantage and beneficial effect of catalyst of the present invention and its application is：
Relative to other noble metal catalysts such as Pd, Ru, Au etc., the active component of this catalyst is relative low price
Cobalt.
Catalyst activity of the present invention is high, can be in low pressure (1bar H2) under realize nitro compound reduction obtain amine
The reaction of compound.
Catalyst of the present invention can be catalyzed the nitrobenzene reduction under different hydrogen sources simultaneously, such as：Carbon monoxide and water combination, first
Acid, alcohols, olefines.
This catalyst is suitable for organic solvent or water, and can reach higher conversion ratio.
The stability of this catalyst is preferable, more than 16 times capable of circulation, with good prospects for commercial application.
Description of the drawings
X-ray diffraction (XRD) collection of illustrative plates of the Fig. 1 for CoN@CN.
Specific embodiment
Some specific embodiments are listed below to be further described the present invention, but are not limited to the model of the present invention
Enclose.
The source of Ludox and tetranitro cobalt peptide cyanines is as follows：
Ludox：Buy from Sigma-Aldrich companies；
Tetranitro cobalt peptide cyanines：By 4- nitro phthalic nitriles, cobaltous acetate, 1,8- diazabicylo [5.4.0], 11 carbon -7- alkene4: 1.2: 0.01 ratio is added in n-butyl alcohol 130 DEG C and stirs 2 days in molar ratio, and resulting solution sucking filtration is obtained
The solid again with methanol washing drying arrived.
Embodiment 1：
A kind of preparation method of nitrogen-doped carbon material load Co (CoN@CN) catalyst, its step are as follows：
By mass ratio for 1: 10 tetranitro cobalt peptide cyanines and Ludox be added to DMF and H2Stirring in the mixed solvent of O is filled
Point, described DMF and H2O volume ratios are 1: 3, and then vacuum distillation removes solvent and obtains tetranitro cobalt peptide cyanines and SiO2Composite wood
Material：CoPc/SiO2；Nitrogen protection calcining 2 hours at 900 DEG C；Template SiO is washed away with 1wt%HF solution2Receive with metallic state Co
Rice corpuscles, are washed to neutral vacuum drying and obtain CoN CN catalyst, and wherein active component is cobalt nitride, the quality of Co elements
Content is 0.18%, and the XRD spectrum of gained CoN@CN catalyst is as shown in figure 1, there is CoN in 2 θ=43.7 °xCharacteristic peak
(JCPDS No.41-0943)。
Embodiment 2：
A kind of preparation method of nitrogen-doped carbon material load Co (CoN@CN) catalyst, its step are as follows：
By mass ratio for 1: 1 tetranitro cobalt peptide cyanines and Ludox be added to DMF and H2Stirring in the mixed solvent of O is filled
Point, described DMF and H2O volume ratios are 1: 1, and then vacuum distillation removes solvent and obtains tetranitro cobalt peptide cyanines and SiO2Composite wood
Material：CoPc/SiO2；Nitrogen protection calcining 2 hours at 800 DEG C；Template SiO is washed away with 15wt%HF solution2It is unstable with surface
Metallic state Co, be washed to neutral vacuum drying and obtain CoN CN catalyst, wherein active component is cobalt nitride, Co elements
Mass content is 0.25%, and gained CoN@CN catalyst carries out XRD detections, CoN occurs in 2 θ=43.7 °xCharacteristic peak (JCPDS
No.41-0943)。
Embodiment 3：
A kind of preparation method of nitrogen-doped carbon material load Co (CoN@CN) catalyst, its step are as follows：
By mass ratio for 1: 20 tetranitro cobalt peptide cyanines and Ludox be added to DMF and H2Stirring in the mixed solvent of O is filled
Point, described DMF and H2O volume ratios are 1: 5, and then vacuum distillation removes solvent and obtains tetranitro cobalt peptide cyanines and SiO2Composite wood
Material：CoPc/SiO2；Nitrogen protection calcining 2 hours at 600 DEG C；Template SiO is washed away with 20wt%HF solution2It is unstable with surface
Metallic state Co, be washed to neutral vacuum drying and obtain CoN CN catalyst, wherein active component is cobalt nitride, Co elements
Mass content is 1%, and gained CoN@CN catalyst carries out XRD detections, CoN occurs in 2 θ=43.7 °xCharacteristic peak (JCPDS
No.41-0943)。
Embodiment 4：
Using application of the CoN@CN catalyst of the preparation of embodiment 1 in reduction Nitrobenzol, its step is as follows：
By Nitrobenzol (0.6mmol), the catalyst (40mg) of different calcining heats prepared by water (5mL), and embodiment 1 adds
Enter in 25mL stainless steel cauldrons, be filled with 3.5bar hydrogen, at 90 DEG C, react 1.5h.Jing gas chromatographic detection, in following table be
Impact of the calcining heat to activity：
Embodiment 5：The activity of CoN CN catalyst under different hydrogen source pressure
Using application of the CoN@CN catalyst of the preparation of embodiment 1 in reduction Nitrobenzol, its step is as follows：
By Nitrobenzol (0.98mmol), catalyst (40mg) prepared by water (10mL), and embodiment 1 is added to reactor
In, the hydrogen of 10bar to 1bar different pressures is filled with, 110 DEG C is heated to and is reacted 1.5 hours.Jing gas chromatographic detection, Nitrobenzol
Conversion ratio such as following table：
H in upper table2Pressure is 1aRepresent and add 0.49mmol, 1bar, 110 DEG C of response time of Nitrobenzol to be 6h, other conditions
It is identical；
H in upper table2Pressure is 1bRepresent and add 0.49mmol, 1bar, 40 DEG C of reaction 12h of Nitrobenzol, other conditions are identical.
Embodiment 6：The activity of CoN@CN catalyst under different solvents
Using application of the CoN@CN catalyst of the preparation of embodiment 1 in reduction Nitrobenzol, its step is as follows：
By Nitrobenzol (0.98mmol), catalyst (40mg) prepared by solvent (16mL), and embodiment 1 is added to 25mL not
Rust steel reactor in, with hydrogen exchange air three times after, all mixture are placed in 10bar hydrogen, 110 DEG C of reactions are added to
1.5h.Jing gas chromatographic detection, nitrobenzene conversion rate such as following table：
Embodiment 7：The activity of CoN CN catalyst under different hydrogen sources and solvent
Using application of the CoN@CN catalyst of the preparation of embodiment 1 in reduction Nitrobenzol, its step is as follows：
By Nitrobenzol (0.98mmol), catalyst (40mg) prepared by solvent (10mL), and embodiment 2 is added to 25mL not
Rust steel reactor in, with nitrogen displacement air 3 times after, mixture is placed in 20bar nitrogen, 12h is reacted at different temperatures.
Jing gas chromatographic detection, aniline yield such as following table：
H in upper table2OaExpression adds 3mmol HCOOH as hydrogen source, and other conditions are identical；
H in upper table2ObWith 5bRepresent and add 5bar CO to replace N2, other conditions are identical；
100cThe yield of expression hutanal aniline condensation product is 100%；
100dRepresent that N- benzylidene anilines yield is 100%.
Embodiment 8：Activity of the CoN@CN catalyst to different substrates
Using application of the CoN@CN catalyst of the preparation of embodiment 1 in reduction nitro compound, its step is as follows：
By different nitro compound 1mmol, catalyst (40mg) prepared by solvent (10mL), and embodiment 3 is added
To in 25mL stainless steel cauldrons, with nitrogen displacement air 3 times after, mixture is placed in 3.5bar hydrogen, 90 DEG C reaction
1.5h.Jing gas chromatographic detection, nitrobenzene derivative conversion ratio such as following table：
Embodiment 9：CoN@CN recycle experiment
According to 4 conditioned response of embodiment, centrifugation after having reacted obtains catalyst, is washed 3 times with water and ethanol respectively, after being dried
Reuse, the conversion ratio such as following table of each access times：
Claims (6)
1. a kind of catalyst, it is characterised in that：For the catalyst of nitrogen-doped carbon material load cobalt, with nitrogen-doped carbon material as bone
Frame, binding activity component cobalt nitride on skeleton, in the catalyst mass content of Co elements be 0.18%-1%, its X-ray
There is CoN in 2 θ=43.7 ° in diffractionxCharacteristic peak.
2. the preparation method of nitrogen-doped carbon material load cobalt catalyst described in claim 1, comprises the following steps：
(1) by mass ratio for 1: 1-1: 20 tetranitro cobalt peptide cyanines and Ludox be added to N-N- dimethylformamide DMF and H2O
Mixed solvent in stirring it is abundant, DMF and H in described mixed solvent2O volume ratios are 1: 1-1: 5；
(2) vacuum distillation removes solvent, obtains tetranitro cobalt peptide cyanines and SiO2Composite：CoPc/SiO2；
(3) CoPc/SiO that will be obtained in step (2)2High temperature pyrolysis under nitrogen protection, pyrolysis temperature are 600 DEG C -900 DEG C, heat
The solution time is 2 hours；
(4) using 1wt%-20wt% hydrogen fluoride solution removal step (3) obtained by solid template SiO2With metallic state Co nanometers
Particle, that is, obtain CoN CN catalyst.
3. application of the nitrogen-doped carbon material load cobalt catalyst described in claim 1 in reduction nitro compound, its step
It is：Catalyst, solvent, nitro compound described in claim 1 proportionally 40mg: 5-16mL: 0.49-1mmol are added
To in reaction vessel, 1bar-20bar reproducibilities or protective gas are filled with, 1-12h is reacted at 40-160 DEG C, reduced
Product.
4. application of the nitrogen-doped carbon material load cobalt catalyst according to claim 3 in reduction nitro compound,
It is characterized in that：Described reducibility gas are hydrogen or carbon monoxide, and described protective gas is the nitrogen of anti-oxidation
Gas.
5. application of the nitrogen-doped carbon material load cobalt catalyst according to claim 3 in reduction nitro compound,
It is characterized in that：Described solvent is water, acetonitrile, ethanol, isopropanol, n-butyl alcohol, benzyl alcohol, toluene, dioxane, acetic acid second
One kind in ester or limonene.
6. application of the nitrogen-doped carbon material load cobalt catalyst according to claim 3 in reduction nitro compound,
It is characterized in that：Described nitro compound is
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Cited By (5)
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|---|---|---|---|---|
| CN111138309A (en) * | 2020-01-21 | 2020-05-12 | 浙江工业大学 | Catalytic hydrogenation reduction method for aromatic nitro compound |
| CN113429301A (en) * | 2021-06-28 | 2021-09-24 | 河北工业大学 | Method for preparing toluenediamine by dinitrotoluene hydrogenation with isopropanol as hydrogen source |
| CN113457708A (en) * | 2021-06-30 | 2021-10-01 | 常州大学 | CoN @ C porous material, preparation method thereof and application of CoN @ C porous material in synthesis of aromatic nitrile compound |
| CN114210332A (en) * | 2022-01-10 | 2022-03-22 | 兰州市三青化学有限公司 | Preparation method of cobalt metal-nitrogen co-doped carbon material catalyst |
| CN114345387A (en) * | 2022-01-10 | 2022-04-15 | 兰州市三青化学有限公司 | Preparation method of nitrogen-doped carbon-supported cobalt catalyst |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111138309A (en) * | 2020-01-21 | 2020-05-12 | 浙江工业大学 | Catalytic hydrogenation reduction method for aromatic nitro compound |
| CN111138309B (en) * | 2020-01-21 | 2023-05-16 | 浙江工业大学 | Catalytic hydrogenation reduction method for aromatic nitro compound |
| CN113429301A (en) * | 2021-06-28 | 2021-09-24 | 河北工业大学 | Method for preparing toluenediamine by dinitrotoluene hydrogenation with isopropanol as hydrogen source |
| CN113429301B (en) * | 2021-06-28 | 2023-11-17 | 河北工业大学 | Method for preparing toluenediamine by hydrogenation of dinitrotoluene with isopropanol as hydrogen source |
| CN113457708A (en) * | 2021-06-30 | 2021-10-01 | 常州大学 | CoN @ C porous material, preparation method thereof and application of CoN @ C porous material in synthesis of aromatic nitrile compound |
| CN113457708B (en) * | 2021-06-30 | 2023-10-20 | 常州大学 | CoN@C porous material, preparation method thereof and application thereof in synthesis of aromatic nitrile compound |
| CN114210332A (en) * | 2022-01-10 | 2022-03-22 | 兰州市三青化学有限公司 | Preparation method of cobalt metal-nitrogen co-doped carbon material catalyst |
| CN114345387A (en) * | 2022-01-10 | 2022-04-15 | 兰州市三青化学有限公司 | Preparation method of nitrogen-doped carbon-supported cobalt catalyst |
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