Catalyst with shell-core structure, and preparation method and application thereof

A core-shell structure and catalyst technology, which is applied in the field of catalysts with a core-shell structure and its preparation, can solve the problems of high energy consumption and achieve the effect of improving activity

Active Publication Date: 2020-11-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, non-noble metals are limited by their activity and need...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Commercially available zinc-loaded alumina and molybdenum-loaded cerium sulfate are kneaded into shape, dried and calcined to prepare composite oxide A containing zinc-loaded alumina and molybdenum-loaded cerium sulfate, and the drying time is 4h , the drying temperature is 100°C; the calcination time is 6h, and the temperature is 400°C.

[0024] The A properties are as follows: the weight ratio of the zinc-loaded alumina to the molybdenum-loaded cerium sulfate is 7:1, based on the weight of the zinc-loaded aluminum oxide, the content of zinc in terms of oxide is 15wt%, and the weight ratio of the loaded molybdenum The weight of cerium sulfate is the basis, and the content of molybdenum in terms of oxide is 2wt%.

[0025] Prepare aluminum hydroxide slurry by hydrolysis of aluminum isopropoxide: mix water and aluminum isopropoxide at a molar ratio of 120:1, control the hydrolysis temperature at 80°C-85°C, hydrolyze aluminum isopropoxide for 1.5h, and then carry out aging...

Embodiment 2

[0029] Mix and knead commercially available zinc-loaded alumina and molybdenum-loaded cerium sulfate, dry and roast to prepare composite oxide B containing zinc-loaded alumina and molybdenum-loaded cerium sulfate, and the drying time is 4h , the drying temperature is 100°C; the calcination time is 6h, and the temperature is 400°C.

[0030] The properties of B are as follows: the weight ratio of the zinc-loaded alumina to the molybdenum-loaded cerium sulfate is 8:1, based on the weight of zinc-loaded alumina, and the content of zinc as oxide is 10 wt%. The weight of molybdenum cerium sulfate is used as a basis, and the content of molybdenum in terms of oxide is 3wt%.

[0031] The aluminum hydroxide slurry is prepared by carbonization method of passing carbon dioxide gas into the sodium metaaluminate solution: 30wt% CO 2 CO 2 / N 2 The mixed gas is passed into the sodium metaaluminate solution, and the gelation reaction is carried out at 30°C. The pH of the reaction end point is...

Embodiment 3

[0035] Commercially available zinc-loaded alumina and molybdenum-loaded cerium sulfate are mixed and kneaded, dried and calcined to prepare composite oxide C containing zinc-loaded alumina and molybdenum-loaded cerium sulfate, and the drying time is 4h , the drying temperature is 100°C; the calcination time is 6h, and the temperature is 400°C.

[0036] The C properties are as follows: the weight ratio of the aluminum oxide loaded with zinc to the cerium sulfate loaded molybdenum is 5:1, based on the weight of aluminum oxide loaded with zinc, the content of zinc in terms of oxide is 20wt%, and the content of zinc is 20wt% based on the weight of loaded molybdenum. The weight of cerium sulfate is the basis, and the content of molybdenum in terms of oxide is 1wt%.

[0037] The aluminum hydroxide slurry is prepared by carbonization method of passing carbon dioxide gas into the sodium metaaluminate solution: 30wt% CO 2 CO 2 / N 2 The mixed gas is passed into the sodium metaalumina...

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Abstract

The invention discloses a catalyst with a shell-core structure, and a preparation method and application thereof. The catalyst takes a composite oxide containing zinc-loaded aluminum oxide and molybdenum-loaded cerous acyl sulfate as a core and uses palladium-loaded aluminum oxide as a shell, and a mass ratio of the shell to the core is 1: 3 to 1: 7. The preparation method of the catalyst comprises the following steps: firstly, mixing and kneading the zinc-loaded aluminum oxide and the molybdenum-loaded cerous acyl sulfate, conducting molding, and carrying out drying and roasting to obtain thecomposite oxide containing the zinc-loaded aluminum oxide and the molybdenum-loaded cerous acyl sulfate; and uniformly mixing a palladium-containing salt and aluminum hydroxide slurry, coating the composite oxide containing the zinc-loaded aluminum oxide and the molybdenum-loaded cerous acyl sulfate with the obtained mixed solution in the manners of spraying and soaking, and carrying out drying and roasting to obtain the catalyst for catalytic combustion of coal bed gas. The catalyst has the advantages of high activity, low reaction temperature, simple preparation method, low cost and the like when being used for deoxidizing the coal bed gas.

Description

technical field [0001] The invention relates to a catalyst with a core-shell structure and its preparation method and application, in particular to a catalytic combustion catalyst with a core-shell structure at low temperature and high activity, its preparation method and its application in gas layer deoxidation. Background technique [0002] my country is a big coal producing country, and a large amount of coalbed methane with different concentrations will be produced every year due to coal production. Developing effective coalbed methane utilization technology and reducing direct methane emissions are the key to building an energy-saving and environmentally friendly sustainable development model in my country and creating a low-carbon economy. an integral part of the system. Combining energy conservation and emission reduction and the improvement of environmental requirements, effectively and reasonably develop coalbed methane, a low-grade energy source, and convert it into...

Claims

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Application Information

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IPC IPC(8): B01J27/053C10L3/10
CPCB01J27/053C10L3/101C10L2290/02Y02P20/52
Inventor 李杰张信伟王海洋韩照明刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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