CN102600851A - Preparation method of catalyst for synthesizing methanol by carbon dioxide hydrogenation - Google Patents

Preparation method of catalyst for synthesizing methanol by carbon dioxide hydrogenation Download PDF

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CN102600851A
CN102600851A CN2012100541499A CN201210054149A CN102600851A CN 102600851 A CN102600851 A CN 102600851A CN 2012100541499 A CN2012100541499 A CN 2012100541499A CN 201210054149 A CN201210054149 A CN 201210054149A CN 102600851 A CN102600851 A CN 102600851A
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carbon dioxide
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catalyst
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高文桂
张明宇
王�华
刘文艳
张逢杰
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Kunming University of Science and Technology
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    • YGENERAL 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
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    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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Abstract

The invention belongs to the technical field of chemical catalysis, and discloses a preparation method of catalyst for synthesizing methanol by carbon dioxide hydrogenation. The active ingredient of the catalyst consists of copper, zinc oxide and zirconium oxide, wherein the molar ratio of Cu to Zn to Zr is equal to (8-4):(1-5):(0-2). The catalyst for synthesizing the methanol by the carbon dioxide hydrogenation is prepared by adopting a microwave hydrothermal carrying vacuum freeze drying method at a low temperature within a short period of time. The catalyst for synthesizing the methanol by the carbon dioxide hydrogenation has the advantages of nanometer scale, high specific surface area, high degree of dispersion, transition of copper and zinc components from crystals to high-dispersion non-crystal phase forms on the surface of the catalyst, high catalytic activity, high selectivity and superior catalytic performance.

Description

A kind of synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method
Technical field
The invention belongs to the chemical industry catalysis technical field, is a kind of synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method.
Technical background
Methyl alcohol is a kind of extremely important industrial chemicals, is widely used in organic synthesis, medicine, fuel, dyestuff, and its output is only second to synthetic ammonia and ethene.Methyl alcohol is not only C 1The basic substance of chemical industry can be produced hundreds of chemical products from methyl alcohol, simultaneously is again a kind of important potential clean fuel that substitutes.
Along with the development of chemical industry technology, methyl alcohol is expected to realize fully with CO 2For raw material is produced, methyl alcohol itself can be done the energy, and this just can realize energy burning-CO 2The circulation of-methyl alcohol-energy burning fundamentally solves the CO that causes because of the fossil energy burning on the earth 2The greenhouse gases problem, the ecological balance of realization carbon cycle.The key issue of research and development synthesizing methanol by hydrogenating carbon dioxide course of reaction is to improve activity of such catalysts and methyl alcohol selectivity.
Be used for this catalyst for reaction at present and develop prematurity still; Majority is to be improved and made by CO synthesizing methanol by hydrogenating catalyst system therefor; The also laboratory research fields that are confined to of relevant both at home and abroad report, research emphasis more concentrate on mostly reaction mechanism research, active component, carrier selection and investigate different preparation methods, reaction condition influence to catalyst performance.Because CO 2Chemical inertness and the unfavorable factor on the thermodynamics, make CO 2Be difficult to activating and reducing, exist that conversion ratio is low, accessory substance reaches the not high shortcoming of methyl alcohol selectivity more with the catalyst of conventional method preparation.In order to overcome the above problems, the improvement research to methanol synthesis catalyst at present mainly concentrates on two aspects: the one, add other elemental constituents beyond the copper zinc-aluminium; The 2nd, the preparation method and the technology of improvement catalst for synthesis of methanol.Specific area is big, decentralization is high and the characteristics of Heat stability is good because of having for nano-structured calalyst, will become a kind of development trend.
Summary of the invention
The purpose of this invention is to provide that a kind of the specific surface area of catalyst that makes is big based on synthesizing methanol by hydrogenating carbon dioxide catalyst for reaction preparation method, decentralization is high, has the good characteristics of methyl alcohol selectivity in carbon dioxide conversion height, the product.
Technical scheme of the present invention is: adopt microwave hydrothermal to carry the synthesizing methanol by hydrogenating carbon dioxide catalyst that vacuum freeze-drying method prepared in lower temperature and short time.
The catalyst of synthesizing methanol by hydrogenating carbon dioxide of the present invention comprises and is prepared as follows step:
(1) configuration Cu (NO 3) 2, Zn (NO 3) 2And Zr (NO 3) 4Mixed solution makes it dissolve mixing fully;
(2) under 50~80 ℃ reaction temperature, above-mentioned drips of solution is incorporated into Na 2CO 3In the solution, the pH of adjustment solution is 7~8, after titration finishes, mixed solution is maintained continuation stirring reaction 30~60min under the reaction temperature, under reaction temperature, leaves standstill 30~120min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) is put into the polytetrafluoroethylsubstrate substrate agitated reactor earlier; Under microwave condition, carry out hydro-thermal reaction, after microwave hydrothermal reaction is accomplished product is carried out suction filtration, washing to neutral and carry out obtaining catalyst sample after the vacuum freeze drying.
In the step of the present invention (1), Cu (NO 3) 2, Zn (NO 3) 2And Zr (NO 3) 4The mol ratio of mixed solution is 8~4:1~5:0~2, and the concentration of mixed solution is 0.1~1mol/L.
Na in the step of the present invention (2) 2CO 3The concentration of solution is 0.1~1.5mol/L.
Polytetrafluoroethylene (PTFE) agitated reactor filling rate is 10%~30% in the step of the present invention (3), and microwave hydrothermal is reflected under 100~200 ℃ of conditions of temperature and heats 30~60min.
Advantage of the present invention and good effect are:
This method adopts microwave hydrothermal to carry vacuum freeze-drying method and prepares methanol synthesis catalyst in lower temperature and short time.Compare with conventional method, avoided the hole collapse phenomenon that caused because of the capillary effect of solid liquid interface, the institutional framework and the pore size distribution of the wet stock after the vacuum freeze drying are preserved to greatest extent at vacuum freeze-drying method; Effectively suppressed the generation of particle agglomeration; Obtained to have nanoscale, specific area is big, and decentralization is high; Catalytic activity is high; The methanol synthesis catalyst that selectivity is good is superior to the catalyst that commonsense method prepares, and is applicable to the reaction of mesolow carbon dioxide hydrogenation catalyst.
The specific embodiment
Below in conjunction with embodiment the present invention is done to further describe, but the invention is not restricted to following scope.
Embodiment 1:
(1) Cu:Zn:Zr=4:5:1 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O, Zr (NO 3) 4Be dissolved in the deionized water, obtaining mixed liquid concentration is 0.1 mol/L;
(2) under 70 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 0.1 mol/L 2CO 3In the solution, the pH of adjustment solution is 7, after titration finishes, mixed solution is maintained continuation stirring reaction 60min under the reaction temperature, under reaction temperature, leaves standstill 120min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 10% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 60min under 200 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ1.
Embodiment 2:
(1) Cu:Zn:Zr=8:4:2 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O, Zr (NO 3) 4Be dissolved in the deionized water, obtaining mixed liquid concentration is 0.8 mol/L;
(2) under 50 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 1 mol/L 2CO 3In the solution, the pH of adjustment solution is 7.5, after titration finishes, mixed solution is maintained continuation stirring reaction 30min under the reaction temperature, under reaction temperature, leaves standstill 100min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 20% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 50min under 160 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ2.
Embodiment 3
(1) Cu:Zn:Zr=5:4:1 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O, Zr (NO 3) 4Be dissolved in the deionized water, obtaining mixed liquid concentration is 1 mol/L;
(2) under 80 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 1.5 mol/L 2CO 3In the solution, the pH of adjustment solution is 8, after titration finishes, mixed solution is maintained continuation stirring reaction 40min under the reaction temperature, under reaction temperature, leaves standstill 30min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 30% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 30min under 100 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ3.
Embodiment 4
(1) Cu:Zn:Zr=4:5:1 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O, Zr (NO 3) 4Be dissolved in the deionized water, obtaining mixed liquid concentration is 0.6 mol/L;
(2) under 60 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 1.3 mol/L 2CO 3In the solution, the pH of adjustment solution is 7, after titration finishes, mixed solution is maintained continuation stirring reaction 50min under the reaction temperature, under reaction temperature, leaves standstill 50min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 15% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 40min under 180 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ4.
Embodiment 5:
(1) Cu:Zn:Zr=8:1:2 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O, Zr (NO 3) 4Be dissolved in the deionized water, obtaining mixed liquid concentration is 0.4 mol/L;
(2) under 70 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 1.1 mol/L 2CO 3In the solution, the pH of adjustment solution is 8, after titration finishes, mixed solution is maintained continuation stirring reaction 35min under the reaction temperature, under reaction temperature, leaves standstill 110min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 25% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 45min under 190 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ5.
Embodiment 6:
(1) Cu:Zn=7:3 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O is dissolved in the deionized water, and obtaining mixed liquid concentration is 1 mol/L;
(2) under 75 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 1.4 mol/L 2CO 3In the solution, the pH of adjustment solution is 7, after titration finishes, mixed solution is maintained continuation stirring reaction 55min under the reaction temperature, under reaction temperature, leaves standstill 120min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 30% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 45min under 190 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ6.
Embodiment 7:
(1) Cu:Zn:Zr=4:5:1 takes by weighing Cu (NO in molar ratio 3) 23H 2O, Zn (NO 3) 26H 2O, Zr (NO 3) 4Be dissolved in the deionized water, obtaining mixed liquid concentration is 0.1 mol/L;
(2) under 80 ℃ reaction temperature, above-mentioned drips of solution is incorporated into the Na that concentration is 1 mol/L 2CO 3In the solution, the pH of adjustment solution is 8, after titration finishes, mixed solution is maintained continuation stirring reaction 55min under the reaction temperature, under reaction temperature, leaves standstill 120min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) being put into filling rate earlier is 30% polytetrafluoroethylsubstrate substrate agitated reactor; Under the microwave condition of reaction, carry out hydro-thermal reaction for heating 45min under 190 ℃ of conditions of temperature, after the microwave hydrothermal reaction is accomplished with product carry out suction filtration, washing to neutral and carry out obtaining back grinding, compressing tablet after the vacuum freeze drying, sieving makes 20~40 order catalyst sample CZZ7.
The activity of such catalysts of above-mentioned preparation detects carries out (stainless steel, tube inner diameter 9mm, long 340mm) on continuous fixed bed reactor.Before each reaction, catalyst all will be at 10% H 2/ N 2In the atmosphere of (volume ratio), normal pressure is reduction 8h down.Activity rating carries out under 250 ℃ the condition at 3Mpa.Loaded catalyst is 1.5g, after 150 ℃ of insulations of reacted product utilization insulating box, carries out online check and analysis with the DGC-6890 gas chromatograph, and TCD, FID detect.Utilize each components contents in the external standard method quantitative analysis tail gas.Evaluation result is seen table 1.
Table 1 catalyst activity evaluation result
Catalyst CO 2Conversion ratio (﹪) Methyl alcohol selectivity (﹪) Methanol yield (﹪)
CZZ1 22.32 25.24 5.6
CZZ2 21.79 23.47 5.1
CZZ3 20.64 22.83 4.7
CZZ4 20.35 21.61 4.4
CZZ5 21.16 23.82 5.0
CZZ6 22.13 24.79 5.4
CZZ7 18.94 19.48 3.7
Reaction condition: T=250 ℃, p=3MPa, GHSV=3000h -1, H 2/ C=3/1 (volume ratio)

Claims (5)

1. synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method is characterized in that preparation process comprises:
(1) configuration Cu (NO 3) 2, Zn (NO 3) 2And Zr (NO 3) 4Mixed solution makes it dissolve mixing fully;
(2) under 50~80 ℃ reaction temperature, above-mentioned drips of solution is incorporated into Na 2CO 3In the solution, the pH of adjustment solution is 7~8, after titration finishes, mixed solution is maintained continuation stirring reaction 30~60min under the reaction temperature, under reaction temperature, leaves standstill 30~120min then and makes solution aging, obtains solid sediment after the filtration;
(3) sediment after filtering in the step (2) is put into the polytetrafluoroethylsubstrate substrate agitated reactor earlier; Under microwave condition, carry out hydro-thermal reaction, after microwave hydrothermal reaction is accomplished product is carried out suction filtration, washing to neutral and carry out obtaining catalyst sample after the vacuum freeze drying.
2. according to claims 1 described synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method, it is characterized in that: Cu (NO in the said step (1) 3) 2, Zn (NO 3) 2And Zr (NO 3) 4The mol ratio of mixed solution is 8~4:1~5:0~2, and the concentration of mixed solution is 0.1~1mol/L.
3. according to claims 1 described synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method, it is characterized in that: the Na in the said step (2) 2CO 3The concentration of solution is 0.1~1.5mol/L.
4. according to claims 1 described synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method, it is characterized in that: polytetrafluoroethylene (PTFE) agitated reactor filling rate is 10%~30%.
5. according to claims 1 described synthesizing methanol by hydrogenating carbon dioxide Preparation of catalysts method, it is characterized in that: microwave hydrothermal is reflected under 100~200 ℃ of conditions of temperature and heats 30~60min.
CN2012100541499A 2012-03-05 2012-03-05 Preparation method of catalyst for synthesizing methanol by carbon dioxide hydrogenation Pending CN102600851A (en)

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CN105363436A (en) * 2014-08-27 2016-03-02 中国石油化工股份有限公司 Carbon monoxide gas phase coupling oxalate synthesis catalyst and preparation method and application thereof
CN106622252A (en) * 2016-11-28 2017-05-10 宁夏大学 Catalyst for production of methanol by CO2 hydrogenation
CN109092312A (en) * 2018-09-19 2018-12-28 昆明理工大学 A kind of hydro-thermal method prepares the method and application of copper-based catalysts
CN109621965A (en) * 2018-12-07 2019-04-16 盐城工学院 A kind of ZnO-ZrO of Copper-cladding Aluminum Bar2Solid solution catalyst and its preparation method and application
CN112121805A (en) * 2020-09-28 2020-12-25 上海应用技术大学 Catalyst for synthesizing methanol by carbon dioxide hydrogenation and preparation and application thereof
CN115722222A (en) * 2021-08-31 2023-03-03 赤壁市高质量发展研究院有限公司 High-surface-area amorphous zirconium oxide catalytic material and preparation method thereof

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN105363436A (en) * 2014-08-27 2016-03-02 中国石油化工股份有限公司 Carbon monoxide gas phase coupling oxalate synthesis catalyst and preparation method and application thereof
CN105363436B (en) * 2014-08-27 2018-02-09 中国石油化工股份有限公司 Carbon monoxide gas phase coupling catalyst for synthesizing oxalic ester, preparation method and its usage
CN106622252A (en) * 2016-11-28 2017-05-10 宁夏大学 Catalyst for production of methanol by CO2 hydrogenation
CN109092312A (en) * 2018-09-19 2018-12-28 昆明理工大学 A kind of hydro-thermal method prepares the method and application of copper-based catalysts
CN109621965A (en) * 2018-12-07 2019-04-16 盐城工学院 A kind of ZnO-ZrO of Copper-cladding Aluminum Bar2Solid solution catalyst and its preparation method and application
CN112121805A (en) * 2020-09-28 2020-12-25 上海应用技术大学 Catalyst for synthesizing methanol by carbon dioxide hydrogenation and preparation and application thereof
CN115722222A (en) * 2021-08-31 2023-03-03 赤壁市高质量发展研究院有限公司 High-surface-area amorphous zirconium oxide catalytic material and preparation method thereof

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Application publication date: 20120725