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Catalyst for catalytic decomposition of nitrous oxide and preparation method of catalyst

A technology for nitrous oxide and catalytic decomposition, which is applied in the fields of nitrous oxide capture, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Activity and other issues

Active Publication Date: 2016-02-03
XIAN ORIGIN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102489305A discloses a catalytic decomposition of N 2 The transition metal composite oxide catalyst of O, copper oxide in the transition metal oxide is 1 to 15% of the total mass of the catalyst, and the promoter is one or more selected from cerium oxide, iron oxide, zirconium oxide, oxide Zinc promoter, which accounts for 1-10% of the total mass of the catalyst, can convert N 2 O completely decomposes into N 2 and O 2 , but the thermal stability of this supported transition metal composite oxide cannot satisfy the N 2 Decomposition of O
CN1283132A discloses a catalyst prepared by exchanging ferrierite with iron, which can operate at lower temperatures, but it is susceptible to H 2 O, O 2 affect its catalytic activity

Method used

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  • Catalyst for catalytic decomposition of nitrous oxide and preparation method of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Embodiment 1: prepare catalyst of the present invention

[0075] The implementation steps of this embodiment are as follows:

[0076] A. Preparation of impregnation solution

[0077] According to the mass ratio of the active component precursor to the auxiliary agent precursor of 0.4:1.0, the cobalt acetate active component precursor and the platinum nitrate auxiliary agent precursor are dissolved in water to obtain a transparent impregnating solution; then

[0078] B. Preparation of catalyst precursor

[0079] At room temperature, according to the ratio of the ceria carrier in grams to the impregnating solution in milliliters is 100:100, allowing the ceria carrier to be impregnated in the impregnating solution obtained in step A for 2.0h to obtain a paste solid, Then dry the paste solid at a temperature of 80° C. for 24 hours, and then grind the obtained dry powder to a particle size of less than 10 μm to obtain a catalyst precursor;

[0080] C. Catalyst molding

...

Embodiment 2

[0086] Embodiment 2: prepare catalyst of the present invention

[0087] The implementation steps of this embodiment are as follows:

[0088] A. Preparation of impregnation solution

[0089] According to the mass ratio of the active component precursor and the auxiliary agent precursor 8.0:0.01, the active component precursor and the palladium nitrate auxiliary agent precursor are dissolved in cobalt acetylacetonate and aluminum acetate (the weight ratio of cobalt and aluminum is 3:1) aqueous solution to obtain a transparent impregnating solution; then

[0090] B. Preparation of catalyst precursor

[0091] At room temperature, according to the ratio of the ceria carrier in grams to the impregnating solution in milliliters is 100:100, allowing the ceria carrier to be impregnated in the impregnating solution obtained in step A for 1.0 h to obtain a paste solid, Then dry the paste solid at a temperature of 120° C. for 12 hours, and then grind the obtained dry powder to a partic...

Embodiment 3

[0098] Embodiment 3: prepare catalyst of the present invention

[0099] The implementation steps of this embodiment are as follows:

[0100] A. Preparation of impregnation solution

[0101] Dissolve cobalt nitrate, aluminum nitrate (cobalt to aluminum weight ratio 4:1) active component precursor and rhodium nitrate auxiliary precursor in aqueous solution according to the mass ratio of active component precursor to auxiliary agent precursor 2.5:0.1 , a transparent impregnating solution was obtained; then

[0102] B. Preparation of catalyst precursor

[0103] At room temperature, according to the ratio of the ceria carrier in grams to the impregnation solution in milliliters is 100:30, the ceria carrier is immersed in the impregnation solution obtained in step A for 1.0h to obtain a paste solid, Then dry the paste solid at a temperature of 90° C. for 20 hours, and then grind the obtained dry powder to a particle size of less than 10 μm to obtain a catalyst precursor;

[0104] ...

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Abstract

The invention discloses a load type oxide catalyst for directly decomposing nitrous oxide. The catalyst is prepared from a carrier and active components, wherein the active components are cobalt, aluminum, zirconium and lanthanum, assistants are platinum, rhodium, palladium and ruthenium, and the carrier is ceric oxide. In addition, the invention also discloses a preparation method of the catalyst. The catalyst has better nitrous oxide direct-decomposing activity and high vapor resistance, has higher activity in a wider temperature range, is strong in stability and free of inactivation after a continuous 50h reaction, and has a conversion rate of more than 90 percent.

Description

【Technical field】 [0001] The invention belongs to the technical field of catalyst preparation. More specifically, the present invention relates to a catalyst for catalytically decomposing nitrous oxide, and also relates to a preparation method of the catalyst. 【Background technique】 [0002] N 2 O has been widely used in the fields of electronic industry and medical technology, as well as technical fields such as semiconductor device manufacturing, pressure packaging and food industry. due to N 2 O is stable in nature and has no obvious toxic effect on the human body. It has not been regarded as a polluting gas for a long time, so it has not received attention from all walks of life. However, studies in the past ten years have shown that nitrous oxide (N 2 O) is a gas with a greenhouse effect and is one of the six greenhouse gases stipulated in the "Kyoto Protocol". At the same time, N 2 O is persistent in the atmosphere for a long time and can be transported to the str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/56
CPCY02C20/10
Inventor 李飞黄伟满雪兰力强庞菊玲侯鑫仵静刘程
Owner XIAN ORIGIN CHEM TECH
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