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A kind of regeneration method of nitrous oxide decomposition catalyst

A technology for catalysts and supported catalysts, applied in catalyst regeneration/reactivation, molecular sieve catalysts, separation methods, etc., can solve problems such as limiting the development of nitrous oxide tail gas emission reduction technology, save time and labor costs, and have high reactivation efficiency , The effect of short process flow

Active Publication Date: 2019-01-22
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 nitrous oxide purification technology in China, mainly because most of the reported nitrous oxide decomposition catalysts catalyze nitrous oxide require a high temperature of about 500-800 ℃, which severely limits the development of nitrous oxide tail gas emission reduction technology

Method used

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  • A kind of regeneration method of nitrous oxide decomposition catalyst

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Effect test

Embodiment 1

[0031] A preparation method for a catalyst for low-temperature decomposition of laughing gas, comprising the steps of:

[0032] a) Zinc nitrate, tin nitrate, and ammonium tungstate were mixed at a molar ratio of 0.2:0.45:0.35 and dissolved in methanol to prepare a mixed solution with a mass fraction of 5%, and the mixed solution was stirred at room temperature for 4 hours.

[0033] b) Immerse the fumed silica in the prepared sulfuric acid solution with a mass fraction of 5%, ultrasonically treat it for 6 minutes, wash with pure water until the pH is 6-7, and dry it in an oven at 90°C for later use.

[0034] c) Mix the mixed solution prepared in step a) with the carrier treated in step b) according to the mass ratio of 1:1, let it stand for 4 hours, dry it in an oven at 90°C, and then bake it in a muffle furnace at 300°C for 5 hours .

[0035] A kind of in-situ regeneration method of the laughing gas low-temperature decomposition catalyst prepared by the above method, comprisi...

Embodiment 2

[0040] A preparation method for a catalyst for low-temperature decomposition of laughing gas, comprising the steps of:

[0041] a) Ferric nitrate, cadmium nitrate, and chromium nitrate were mixed at a molar ratio of 0.4:0.45:0.15 and dissolved in ethanol to prepare a mixed solution with a mass fraction of 10%, and the mixed solution was stirred at room temperature for 10 h.

[0042] b) Immerse the ZSM-5 molecular sieve in the prepared hydrochloric acid solution with a mass fraction of 10%, ultrasonically treat it for 12 minutes, wash it with pure water until the pH is 6-7, and dry it in an oven at 110°C for later use.

[0043] c) Mix the mixed solution prepared in step a) with the carrier treated in step b) at a mass ratio of 1:1, let it stand for 10 hours, dry it in an oven at 100°C, and then bake it in a muffle furnace at 800°C for 12 hours .

[0044] A kind of in-situ regeneration method of the laughing gas low-temperature decomposition catalyst prepared by the above metho...

Embodiment 3

[0049] A preparation method for a catalyst for low-temperature decomposition of laughing gas, comprising the steps of:

[0050] a) molybdenum nitrate, manganese nitrate, cerium nitrate, ferric nitrate are mixed in molar ratio 0.4:0.35:0.1:0.15 and dissolved in isopropanol to prepare a mixed solution with a mass fraction of 8%, and mix the mixed solution at room temperature Stir and place for 6h.

[0051] b) Immerse the TS-1 molecular sieve in the prepared hydrochloric acid solution with a mass fraction of 8%, ultrasonically treat it for 10 minutes, wash it with pure water until the pH is 6-7, and dry it in an oven at 110°C for later use.

[0052] c) Mix the mixed solution prepared in step a) with the carrier treated in step b) at a mass ratio of 1:1, let it stand for 8 hours, dry it in an oven at 105°C, and then bake it in a muffle furnace at 600°C for 10 hours.

[0053] A method for in-situ regeneration of the nitrous oxide air deep oxidation catalyst prepared by the above m...

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Abstract

The invention provides a method for regenerating a laughing gas low-temperature decomposition catalyst. The method comprises the following steps: S1, pumping pure water into a fixed bed reactor with 0.8 g of a deactivated catalyst at the speed of 0.1-10 ml / min, heating the inside of the fixed bed reactor to the temperature of 200-800 DEG C under the control, vaporizing and treating for 1-24 hours; S2, pumping an acid solution with mass fraction of 4-8% into the fixed bed reactor at the speed of 0.1-10 ml / min, heating the inside of the fixed bed reactor to the temperature of 300-700 DEG C under the control, and treating for 1-30 minutes; and S3, pumping an ammonium salt solution with the mass fraction of 4-8% into the fixed bed reactor at the speed of 0.1-10 ml / min, heating the inside of the fixed bed reactor to be temperature of 300-700 DEG C under the control, and treating for 1-30 minutes. The catalyst in the fixed bed reactor can be directly regenerated in situ, and after the catalyst is regenerated, the catalysis level of the regenerated catalyst can be basically equal to the catalysis of a fresh catalyst.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and specifically relates to an in-situ regeneration method for a low-temperature decomposition catalyst of nitrous oxide. Background technique [0002] Nitrous oxide (laughing gas), commonly known as laughing gas, is a colorless gas with a faint sweet taste. It has the effect of arousing people's nerve excitement and making people laugh. It is also called laughing gas. It is often used in surgery in medicine. Anesthetic. Studies in recent years have found that laughing gas has a strong greenhouse effect, and its destructive effect on the ozone layer is greater than that of chlorofluorocarbons. The ability to cause greenhouse effects (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 transmitted to the stratosphere, it can be con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/02B01J38/06B01J38/60B01J38/64B01J23/30B01J23/745B01J29/46B01J29/72B01J29/78B01D53/96B01D53/86B01D53/54
CPCY02C20/10
Inventor 吉利刘文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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