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Catalyst for decomposing laughing gas and preparation method thereof

A catalyst and co-catalyst technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high catalyst cost, loss of activity, easy sintering, etc.

Inactive Publication Date: 2009-07-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The catalyst directly makes N 2 O is decomposed into nitrogen and oxygen. The catalyst has strict requirements on the impurity content in the flue gas. The catalyst is easy to sinter under high temperature conditions and loses its activity. The life of the catalyst is usually less than 2 years. The cost of the catalyst is very high, which greatly reduces the production and operation costs. improve

Method used

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  • Catalyst for decomposing laughing gas and preparation method thereof
  • Catalyst for decomposing laughing gas and preparation method thereof
  • Catalyst for decomposing laughing gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Cordierite (400 holes / inch 2 ) after grinding and screening to obtain 40-60 mesh solid particles, after washing and pretreatment, blow-dry at 110°C for 3 hours, impregnate Al 2 o 3 The sol was used to modify the carrier, air-dried at 105° C. for 10 hours, and calcined at 650° C. for 2 hours to obtain a catalyst carrier.

[0025] Weigh cobalt nitrate [Co(NO 3 ) 2 ·6H 2 O] 9.2g, dissolved in 200mL of distilled water to obtain a cobalt nitrate solution; weigh 100g of the prepared carrier, place it in the cobalt nitrate solution and immerse it for 12.0 hours and then filter, and the filter residue was air-dried in an oven at 110°C for 3 hours to obtain a catalyst precursor I.

[0026] Weigh nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O] 21.5g was dissolved in 200mL distilled water to obtain a nickel nitrate solution; the above catalyst precursor I was placed in the nickel nitrate solution for 0.5 hours and then filtered, and the filter residue was air-dried in an oven at 110°...

Embodiment 2

[0029] Cordierite (400 holes / inch 2 ) after grinding and screening to obtain 40-60 mesh solid particles, after washing and pretreatment, blow-dry at 110°C for 3 hours, impregnate Al 2 o 3 The sol was used to modify the carrier, air-dried at 100° C. for 4.5 hours, and calcined at 600° C. for 2 hours to obtain a catalyst carrier.

[0030] Weigh cobalt nitrate [Co(NO 3 ) 2 ·6H 2 O] and [Ca(NO 3 ) 2 ·6H 2 O] 10.0g and 3.5g were dissolved in 200mL distilled water to obtain cobalt nitrate+calcium nitrate solution; 100g of the prepared carrier was weighed, placed in cobalt nitrate solution for 10 hours and then filtered, and the filter residue was placed in an oven at 95°C Blow drying for 12 hours to obtain the catalyst precursor II.

[0031] Weigh chloroplatinic acid [H 2 PtCl 6 ·6H 2 O] and nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O] 2.5g and 20.0g were dissolved in 200mL distilled water to obtain a solution containing nickel nitrate and chloroplatinic acid, and the catalyst...

Embodiment 3

[0034] Weigh cobalt nitrate [Co(NO 3 ) 2 ·6H 2 O], magnesium nitrate [Mg(NO 3 ) 2 ·6H 2 O] and zinc nitrate 8.6g, 10.4g and 6.4g, dissolve in 200mL distilled water, obtain containing cobalt nitrate and magnesium nitrate solution; Weigh the Al 2 o 3 Carrier 100g was placed in cobalt nitrate+magnesium nitrate solution, filtered after soaking for 10 hours, and the filter residue was air-dried in an oven at 95°C for 12 hours to obtain catalyst precursor III; weigh 12.8g of nickel nitrate [Ni(NO 3 ) 2 ·6H 2O], dissolved in 200mL of distilled water to obtain a nickel nitrate solution, the catalyst precursor III was placed in the nickel nitrate solution and immersed for 2.0 hours, filtered, and the filter residue was dried at 100°C for 10 hours, and roasted in a muffle furnace at 550°C for 3 hours to obtain the decomposition Laughing Gas Catalyst III.

[0035] Weigh 1g of prepared catalyst III in a fixed bed reactor, at 300°C, gas volume composition 1.35% (v)N 2 O+1.8%(v)O ...

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Abstract

The invention relates to a catalyst for catalytic decomposition of nitrous oxide in industrial waste gas and the preparation method of the catalyst, belonging to the field of development of industrial catalysts. The prior catalysts have the disadvantages of sensitivity for impurities in waste gas, easy loss of activity caused by poisoning, short service life and expensive price. The catalyst for catalytic decomposition of the nitrous oxide in the industrial waste gas belongs to a carrying type catalyst, wherein Al2O3 or dichroite is used as a carrier, one of or a plurality of metallic oxides of IIA, IIB and VIII are used as active components, Ni and Pt are preferably selected as the main active components of the catalyst, and Co and Mg are preferably selected as the auxiliary active components of the catalyst; the content of the main active components of the catalyst is 0.01 to 15.0 percent (wt) of the total content of the catalyst, and the content of the auxiliary active components of the catalyst is 0.0 to 20.0 percent (wt) of the total content of the catalyst. The method of immersion is used for preparing the catalyst in the following steps: firstly, the carrier is used for immersing the auxiliary active components of the catalyst, and then, the main active components of the catalyst after being dried are immersed; finally, the catalyst is obtained after the processes of drying and roasting. The catalyst for catalytic decomposition of the nitrous oxide in the industrial waste gas has the advantages of highly effective decomposability, high stability, low price and the like.

Description

technical field [0001] The invention belongs to the field of industrial catalyst development, in particular to a supported catalyst for catalytically decomposing laughing gas in industrial waste gas into nitrogen and oxygen and a preparation method thereof. Background technique [0002] With the development of the economy, people's material quality of life is constantly improving, the variety of chemical products is increasing, the quality of the products is constantly improving, and the degree of large-scale industrialization is gradually increasing. However, the damage caused by large-scale industrialized production to the environment is becoming more and more serious. The environment has been severely damaged, and the protection of the environment and the prevention of environmental pollution have been highly valued by countries all over the world, and they have taken active actions to protect the environment on which human beings live. Exhaust gases from industrial produ...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/89B01D53/56
Inventor 朱景利张金昌王艳辉尹静梅陈旭赵纯革张元礼
Owner BEIJING UNIV OF CHEM TECH
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