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Double metal cobalt-based catalyst and preparation method and application

A metal cobalt-based, catalyst technology, used in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc., can solve the problem that active oxide nanoparticles are limited by the immobilization of carriers. , active oxide sintering, mutual agglomeration and other problems, to achieve the effect of improving hydrothermal stability, accelerating catalytic cycle and prolonging service life

Active Publication Date: 2017-07-28
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] A fatal shortcoming of the above metal oxide catalysts is that the active oxide nanoparticles are limited by the immobilization effect of the carrier, and they are easy to separate from the carrier and agglomerate with each other under the condition of long-term high-temperature reaction or the presence of water and oxygen in the reaction atmosphere, and the generation of active oxides The sintering causes the deactivation phenomenon

Method used

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  • Double metal cobalt-based catalyst and preparation method and application
  • Double metal cobalt-based catalyst and preparation method and application
  • Double metal cobalt-based catalyst and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 1.79g CoCl 2 ·6H 2 O, 1.87g Co(Ac) 2 4H 2 O, 0.13g CuCl 2 2H 2 O, 0.15g Cu(Ac) 2 ·H 2 O and 42.2g of hexamethylenetetramine were added into 1L with a volume ratio of 2.5:1 and stirred in an aqueous ethanol solution (Co ion concentration 0.015mol / L, the mole fraction ratio of its inorganic salt and organic salt was 1:1; co-active metal The concentration of Cu ions is 0.0015mol / L, and the mole fraction ratio of its inorganic salt and organic salt is 1:1; the concentration of hexamethylenetetramine is 0.30mol / L), and the operating temperature is increased to 50°C, and added to the mixed solution 8.0 g of polyvinylpyrrolidone until complete dissolution. Continue to add 0.045mol H to the mixed solution 2 o 2 After the solution system gradually turns brown, the reaction system is sealed and kept under vigorous stirring for 24 hours to obtain a highly uniformly dispersed nanoparticle suspension of tricobalt tetroxide and copper oxide bimetallic composite oxide. ...

Embodiment 2

[0049] Weigh 1.82g Co(NO 3 ) 2 ·6H 2 O, 1.61g Co(acac) 2 , 0.15g Cu(NO 3 ) 2 ·3H 2 O, 0.16g Cu(acac) 2 Add 35.1g of hexamethylenetetramine into 1L of ethanol aqueous solution with a volume ratio of 2:1 and stir and mix (Co ion concentration 0.0125mol / L, the mole fraction ratio of its inorganic salt and organic salt is 1:1; the auxiliary active metal Cu The ion concentration is 0.00125mol / L, and the mole fraction ratio of its inorganic salt and organic salt is 1:1; the concentration of hexamethylenetetramine is 0.25mol / L), and the operating temperature is increased to 60°C, and 6.1 g polyvinylpyrrolidone until complete dissolution. Continue to add 0.025mol H to the mixed solution 2 o 2 After the solution system gradually turns brown, seal the reaction system and keep vigorously stirring for 18 hours to obtain a highly uniformly dispersed suspension of bimetallic composite oxide nanoparticles of tricobalt tetroxide and copper oxide.

[0050] Take 0.31g Zr(NO 3 ) 4 ·5...

Embodiment 3

[0055] Weigh 1.46g Co(NO 3 ) 2 ·6H 2 O, 1.25g Co(Ac) 2 4H 2O, 0.12g Cu(NO 3 ) 2 ·3H 2 O, 0.10gCu(Ac) 2 ·H 2 O and 23.4g of hexamethylenetetramine were added into 1L of 0.1:1 ethanol aqueous solution and stirred and mixed (Co ion concentration 0.01mol / L, the mole fraction ratio of its inorganic salt and organic salt was 1:1; co-active metal The concentration of Cu ions is 0.001mol / L, and the mole fraction ratio of its inorganic salt and organic salt is 1:1; the concentration of hexamethylenetetramine is 0.17mol / L), and the operating temperature is raised to 80°C, and added to the mixed solution 5.0 g of polyvinylpyrrolidone until complete dissolution. Continue to add 0.01mol H to the mixed solution 2 o 2 After the solution system gradually turned brown, the reaction system was sealed and kept vigorously stirred for 12 hours to obtain a highly uniformly dispersed suspension of bimetallic composite oxide nanoparticles of tricobalt tetroxide and copper oxide.

[0056] ...

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Abstract

The invention discloses a double metal cobalt-based catalyst, which comprises an active oxide kernel and a porous inert oxide shell layer, wherein the component of the active oxide kernel is one of a main active component Co3O4 and an auxiliary active component Cu oxide or Fe oxide; the porous inert oxide shell layer comprises a component SiO2-NxOy, wherein NxOy is one of ZrO2 or CeO2; and the weight percent of the main active component Co3O4 is 10-40wt%; the weigh percent of the auxiliary active component sis 1-5wt%, the weight percent of the NxOy is 1-3wt% and the balance is SiO2. The double metal cobalt-based catalyst has the advantages that the high-temperature stability and the hydrothermal stability of active metal oxide nanoparticles are improved, the activity of the catalyst is improved and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention belongs to a bimetallic cobalt-based catalyst, a preparation method and an application. Background technique [0002] Nitrous oxide (N 2 O) has long been considered as a gas that is harmless to the environment and is widely used in fields such as industry and medicine. In recent years, with the 2 With the in-depth cognition and research of O, its environmental hazards have been recognized. N 2 O can not only destroy the ozone layer, but also an important greenhouse gas, its global warming potential value is respectively 2 310 times and CH 4 21 times. The Paris Agreement adopted in December 2015 will CO 2 、CH 4 , N 2 O, O 3 The emission reductions of six greenhouse gases, including chlorofluorocarbons, hydrochlorofluorocarbons and perfluorocarbons, have been incorporated into a unified legal framework. N 2 The control and elimination of O emissions has become an important issue that all countries must face, and the research and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/83B01J35/10B01D53/86B01D53/56B82Y30/00B82Y40/00
CPCB01D53/8628B82Y30/00B82Y40/00B01J23/002B01J23/75B01J23/83B01D2257/402B01D2258/0283B01J2523/00B01J35/40B01J35/615B01J2523/17B01J2523/41B01J2523/48B01J2523/845B01J2523/3712B01J2523/842Y02C20/10
Inventor 王长真赵永祥王永钊李海涛
Owner SHANXI UNIV
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