Core-shell structure type copper-based catalyst as well as preparation method and application thereof

A copper-based catalyst, core-shell structure technology, applied in the preparation of hydroxyl compounds, chemical instruments and methods, preparation of organic compounds, etc. Amplified, stable performance, simple to prepare effects

Active Publication Date: 2015-12-23
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of core-shell structure copper-based catalyst and its preparation method and application, be used to solve the copper nano-particle in the copper-based catalyst in the prior art in use and It is easy to aggregate and sinter during heat treatment, resulting in a decrease in activity or even deactivation

Method used

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  • Core-shell structure type copper-based catalyst as well as preparation method and application thereof
  • Core-shell structure type copper-based catalyst as well as preparation method and application thereof
  • Core-shell structure type copper-based catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of the catalyst: Dissolve 0.182g of copper acetate in 1000mL of ethanol solvent, add 0.182g of polyvinylpyrrolidone as a stabilizer, stir until completely dissolved to obtain a precursor salt solution, and transfer the precursor salt solution to polytetrafluoroethylene CuO nanoparticles were prepared by reacting at 140 °C for 6 h in a lined reactor. Subsequently, the CuO nanoparticles were transferred to a mixed solution of ethanol (1000mL), deionized water (1000mL), and ammonia water (50mL) to react for 0.5h, and 3.644g of cetyltrimethylammonium bromide (CTAB ), continue to react for 1h; then follow TEOS: Cu(Ac) 2 =10:1 (molar ratio), slowly add tetraethyl orthosilicate (TEOS) to the solution, and continue the reaction for 12h. After the reaction, wash twice with deionized water and ethanol respectively, and dry the obtained precipitate at 60°C overnight, and bake the dried sample at 450°C for 8 hours, so as to prepare the core-shell structure material CuO...

Embodiment 2

[0033] Preparation of the catalyst: Dissolve 0.364g of copper acetate in 1000mL of ethanol solvent, add 1.820g of polyvinylpyrrolidone as a stabilizer, stir until completely dissolved, obtain a precursor salt solution, transfer the precursor salt solution to polytetrafluoroethylene CuO nanoparticles were prepared by reacting at 150 °C for 5 h in a lined reactor. Subsequently, the CuO nanoparticles were transferred to a mixed solution of ethanol (1000mL), deionized water (1000mL), and ammonia water (100mL) to react for 0.5h, 5.831gCTAB was added thereto, and the reaction was continued for 1h; then according to TEOS: Cu(Ac ) 2 =3:1 (molar ratio), slowly add TEOS to the solution, and continue to react for 24h. After the reaction, wash twice with deionized water and ethanol respectively, and dry the obtained precipitate at 70°C overnight, and bake the dried sample at 500°C for 6h to prepare CuO@m-SiO 2 .

[0034] Take 1.00 g of the above sample and put it in a fixed-bed reactor...

Embodiment 3

[0036] Preparation of the catalyst: Dissolve 0.546g of copper acetate in 1000mL of ethanol solvent, add 8.190g of polyvinylpyrrolidone as a stabilizer, stir until completely dissolved to obtain a precursor salt solution, and transfer the precursor salt solution to polytetrafluoroethylene CuO nanoparticles were prepared by reacting at 160 °C for 4 h in a lined reactor. Subsequently, the CuO nanoparticles were transferred to a mixed solution of ethanol (1000mL), deionized water (1000mL), and ammonia water (150mL) to react for 0.5h, 6.560gCTAB was added thereto, and the reaction was continued for 1h; then according to TEOS: Cu(Ac ) 2 =6:1 (molar ratio), slowly add TEOS to the solution, and continue to react for 36h. After the reaction, wash twice with deionized water and ethanol each, and dry the obtained precipitate at 80°C overnight, and bake the dried sample at 550°C for 5h to prepare CuO@m-SiO 2 .

[0037] Take 1.00 g of the above sample and put it in a fixed-bed reactor, ...

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Abstract

The invention provides a core-shell structure type copper-based catalyst as well as a preparation method and application thereof. The catalyst takes Cu as a core and takes mesoporous SiO2 as a shell layer material, the weight percentage of Cu is 8-25%, and the weight percentage of SiO2 is 75-92%. The core-shell structure type nano-composite catalyst material is uniform in grain distribution, adjustable in size, good in dispersibility, small in inner core copper grain, large in specific surface area, good in stability performance, and long in service life; in CO2 hydrogenation reaction operation, the catalyst is stable in performance, and high in activity, and can be operated at a high temperature (240-300 DEG C); the high CO2 conversion per pass can be still kept after long period evaluation, and the core-shell structure type copper-based catalyst has the advantages of being low in cost, easy to operate, easy to enlarge in industry and the like.

Description

technical field [0001] The present invention relates to a kind of catalyst and its preparation method and application, especially relate to a kind of core-shell structure copper-based catalyst and its preparation method and CO 2 Application in hydrogenation synthesis of methanol. Background technique [0002] Atmospheric CO 2 The greenhouse effect caused by the increase in concentration and the increasing depletion of fossil fuels are of great concern. will CO 2 Conversion to methanol is an effective way to solve the two major problems of greenhouse gas emissions and fossil fuel substitution, because methanol is not only an important organic chemical raw material, but also a non-petroleum-based clean synthetic fuel. The research on the activity, heat resistance and stability of methanol synthesis catalysts has always been the focus of researchers. Due to the advantages of high low-pressure activity, low cost, and good comprehensive performance, copper-based catalysts are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C07C31/04C07C29/154
CPCY02P20/52
Inventor 孙予罕魏伟王慧杨海艳高鹏夏林张艳飞肖硕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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