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Catalyst for decomposing nitrous oxide and preparation method of catalyst

A technology for nitrous oxide and catalyst is applied in the field of catalyst for decomposing nitrous oxide and its preparation, and achieves the effects of increasing reactive sites, reducing environmental pollution and uniform distribution

Inactive Publication Date: 2015-03-25
LANZHOU TIANYUE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Have not seen the same as described in the present invention and be used for direct catalytic decomposition N 2 A wide temperature catalyst for O and a report on its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Put 40g of cobalt nitrate and nickel nitrate (molar ratio 10:1~1:10) and zirconium nitrate and zirconia powder (molar ratio is 1:1~1:10) in a beaker, add 5000ml deionized Water, stir and heat up to 40-85°C, continue to stir for 30 minutes, add 0.25-1.0mol / L precipitant dropwise under stirring conditions, control the dropwise addition within 15-60 minutes, the final pH is 8.5, keep stirring at constant temperature for 0.5-2 hours , aging for 1 to 12 hours, filtering and washing the precipitate three times.

[0019] (1) Put 40g of a mixture of cobalt nitrate and nickel nitrate with a molar ratio of 1:10, zirconium nitrate and zirconia powder in a beaker, add 5000ml of deionized water, stir and heat up to 85°C, continue to stir for 30 minutes, and stir Add 1.0mol / L sodium carbonate dropwise under the conditions, control the dropwise addition within 15 minutes, the final pH is 8.5, stir at constant temperature for 2 hours, age for 1 hour, filter and wash the precipitate...

Embodiment 2

[0024] (1) Put 40g of a mixture of cobalt nitrate and manganese nitrate with a molar ratio of 10:1, zirconium nitrate and zirconia powder in a beaker, add 5000ml of deionized water, stir and heat up to 40°C, continue to stir for 30 minutes, and stir Add 0.25mol / L sodium hydroxide dropwise under the conditions, control the dropwise addition within 60 minutes, the final pH is 8.5, stir at constant temperature for 0.5 hours, age for 12 hours, filter and wash the precipitate three times; among them, zirconium nitrate and zirconium oxide The molar ratio is 1:10;

[0025] (2) Dry the washed precipitate to a water content of 20%, add methyl cellulose with 1% weight of the precipitate, knead, and extrude;

[0026] (3) Roasting the dried and formed material at a temperature range of 700°C for 10 hours to obtain N 2 Catalyst for O decomposition.

[0027] The catalyst activity experiment is carried out under normal pressure, the gas space velocity is 5000~h-1, N 2 The inlet concentrat...

Embodiment 3

[0029] (1) Put 40g of a mixture of cobalt nitrate and iron nitrate with a molar ratio of 1:5, zirconium nitrate and zirconia powder in a beaker, add 5000ml of deionized water, stir and heat up to 60°C, continue to stir for 30 minutes, and stir Add 0.5 mol / L potassium carbonate dropwise under the conditions, control the dropwise addition within 30 minutes, the final pH is 8.5, stir at constant temperature for 2 hours, age for 2 hours, filter and wash the precipitate three times; among them, the moles of zirconium nitrate and zirconium oxide The ratio is 1:2;

[0030] (2) Dry the washed precipitate until the water content is 25%, add silica sol with 2% weight of the precipitate, knead, and extrude;

[0031] (3) Roasting the dried and shaped material at a temperature range of 600°C for 3 hours to obtain N 2 Catalyst for O decomposition.

[0032] The catalyst activity experiment is carried out under normal pressure, the gas space velocity is 60000h-1, N 2The inlet concentration...

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Abstract

The invention discloses a catalyst for decomposing nitrous oxide and a preparation method of the catalyst. The catalyst is prepared by the deposition precipitation method. The method comprises the processes of preparing a deposit, washing, forming a deposit, activating through the catalyst, etc.; the catalyst comprises active ingredients, a carrier which is zirconium oxide, and additives, wherein the active ingredients include one or more than two of Co, Ni, Fe and Mn; the additives include one or more of cerium oxide, lanthanum oxide and barium oxide. A catalyst activity experiment shows that nitrous oxide can be completely catalytically decomposed into nitrogen and oxygen at the temperature ranging from 450 to 700 DEG C; therefore, the activation temperature is low, and the T50 (reaction temperature under conversion rate of 50%) is about 350 DEG C. The catalyst is high in activity and outstanding in heat resistance, has a wide operation window, and enables the concentration of nitrous oxide in industrial waste gas to be greatly reduced, and therefore, the environmental pollution is decreased; the catalyst is particularly suitable for N2O removal of a nitric plant and an adipic acid plant.

Description

technical field [0001] The invention relates to a catalyst for decomposing nitrous oxide and a preparation method thereof, which is an efficient air pollution control method, especially suitable for the removal of N2O in nitric acid plants and adipic acid plants, and belongs to the field of combining heterogeneous catalysis and environmental protection . Background technique [0002] Nitrous oxide (N 2 O) Commonly known as laughing gas, it is a colorless and slightly sweet gas that has an anesthetic effect on the human body. Inhalation of a small amount can make people's nerves excited and make them laugh. It can be used as an anesthetic for minor operations in medicine. N 2 O has a strong greenhouse effect and can also cause the destruction of the ozone layer. Its greenhouse effect is more than 300 times that of carbon dioxide and more than 20 times that of methane. N 2 O mainly comes from the combustion process of fossil fuels, the chemical industry and automobile exha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/889B01J23/75B01J23/34B01J23/83B01J23/78B01D53/86B01D53/56
CPCY02C20/10Y02P20/30
Inventor 周传智吴梅兰何正霞李彧飞何孝琴
Owner LANZHOU TIANYUE ENVIRONMENTAL PROTECTION TECH CO LTD
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