Cobalt-based molecular sieve catalyst for low-temperature decomposition of nitrous oxide and preparation method of catalyst

A molecular sieve and catalyst technology, applied in the field of cobalt-based molecular sieve catalyst and its preparation, can solve problems such as restricting development, and achieve the effects of avoiding secondary pollution, saving energy consumption and low cost

Inactive Publication Date: 2016-11-23
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there is no mature N 2 O purification technology, mainly lies in the reported N 2 O decomposition catalyst catalyzes N 2 O mostly requires a high temperature of about 500-800 °C, which severely limits the N 2 O The development of tail gas emission reduction technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] S1: Mix cobalt nitrate and chromium nitrate in a certain proportion and dissolve them in water to prepare a mixed solution with a mass fraction of 10%;

[0032] S2: Immerse the TS-1 molecular sieve catalyst in the prepared sodium hydroxide solution with a mass fraction of 2%, treat it in a closed hydrothermal reaction kettle at 100°C for 12h, and wash it with pure water until the pH is 7-8 , dried in an oven at 100°C for 12 hours for later use;

[0033] S3: Mix the mixed solution prepared in step 1) with the molecular sieve catalyst treated in step 2) according to a certain ratio, let it stand for 12 hours, dry it in an oven at 100°C, and then bake it in a muffle furnace at 300°C for 1 hour.

[0034] Each of the above components (metal salts are calculated as corresponding oxides) Co 2 o 3 : Cr 2 o 3 : TS-1 mass ratio is 5:10:85.

Embodiment 2

[0036] S1: Mix cobalt nitrate and cerium nitrate in a certain proportion and dissolve them in water to prepare a mixed solution with a mass fraction of 10%;

[0037] S2: Immerse the S-1 molecular sieve catalyst in the prepared sodium hydroxide solution with a mass fraction of 20%, and treat it in a closed hydrothermal reaction kettle at 180°C for 24 hours. After the treatment, wash it with pure water until the pH is 7-8 , dried in an oven at 100°C for 12 hours for later use;

[0038] S3: Mix the mixed solution prepared in step 1) with the molecular sieve catalyst treated in step 2) according to a certain ratio, let it stand for 12 hours, dry it in an oven at 100°C, and then bake it in a muffle furnace at 800°C for 36 hours.

[0039] Each of the above components (metal salts are calculated as corresponding oxides) Co 2 o 3 : CeO 2 :S-1 mass ratio is 20:0.5:79.5.

Embodiment 3

[0041] S1: Mix cobalt nitrate and bismuth nitrate in a certain proportion and dissolve them in water to prepare a mixed solution with a mass fraction of 10%;

[0042] S2: Immerse the MCM-41 molecular sieve catalyst in the prepared potassium hydroxide solution with a mass fraction of 10%, treat it in a closed hydrothermal reaction kettle at 130°C for 20 hours, and wash it with pure water until the pH is 7-8 , dried in an oven at 100°C for 12 hours for later use;

[0043] S3: Mix the mixed solution prepared in step 1) with the molecular sieve catalyst treated in step 2) according to a certain ratio, let it stand for 12 hours, dry it in an oven at 100°C, and then bake it in a muffle furnace at 500°C for 12 hours.

[0044] Each of the above components (metal salts are calculated as corresponding oxides) Co 2 o 3 : Bi 2 o 3 :MCM-41 mass ratio is 15:10:75.

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Abstract

The invention provides a cobalt-based molecular sieve catalyst and a preparation method thereof. The preparation method includes: mixing cobalt with one or multiple of soluble metal salts of Cr, Bi, Ce, Sn and Cd to prepare a mixed solution of 10%+/-5% in mass percentage; soaking a molecular sieve carrier in an alkaline solution, performing airtight hydrothermal reaction treatment, washing, and drying; mixing the mixed solution obtained in the above steps with the molecular sieve carrier, drying, and then roasting at 300-800 DEG C. By using the cobalt-based molecular sieve catalyst, complete decomposition temperature of N2O can be substantially lowered to below 400 DEG C.

Description

technical field [0001] The invention belongs to the technical field of emission reduction and control of industrial greenhouse gas nitrous oxide pollution, and specifically relates to a cobalt-based molecular sieve catalyst for low-temperature decomposition of nitrous oxide and a preparation method thereof. Background technique [0002] Nitrous oxide (N 2 O) is a colorless gas with a faint sweet smell. It has the effect of arousing people's nervous excitement and making people laugh. It is also called laughing gas. It is often used as an anesthetic in medicine. Recent studies have found that N 2 O has a strong greenhouse effect, and its destructive effect on the ozone layer is greater than that of chlorofluorocarbons. The ability to cause the greenhouse effect (warming potential, GWP) is 310 times that of carbon dioxide and 21 times that of methane. Due to its stable chemical properties, this gas can persist for as long as 150 years in the troposphere; when it is transmitt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89B01J29/76B01J29/04B01J29/46B01J29/80
CPCB01J29/89B01J29/045B01J29/46B01J29/76B01J29/80B01J2229/186
Inventor 刘文吉利杨琦武白世杰张媛艾晓欣陈涛李亚楠江屿陈晨张丰杨王琳徐烨琨
Owner CHINA TIANCHEN ENG
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