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Chromium-cobalt-based nitric oxide normal-temperature normal-pressure catalyst, and preparation method and application thereof

A nitric oxide and catalyst technology, which is applied in the field of preparation of chromium-cobalt-based nitric oxide catalysts at normal temperature and pressure, can solve the problems of restricting the catalytic performance and service life of catalysts, difficult desorption, etc., and achieve good NO temperature oxidation activity and accelerated Desorption rates, effects of optimized interactions

Active Publication Date: 2020-02-25
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above catalysts have a common problem in the NO catalytic oxidation reaction, that is, the produced NO 2 It is difficult to desorb, which directly restricts the catalytic performance and service life of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A chromium-cobalt-based nitric oxide catalyst at normal temperature and pressure, which is prepared by an optimized co-precipitation method. By introducing a small amount of L-ascorbic acid during the precipitation process, the surface physical and chemical properties of the chromium-cobalt-based catalyst are regulated, and the nitric oxide of the material is improved. Normal temperature and pressure catalytic performance, prepared according to the following steps:

[0025] In the first step, chromium nitrate and cobalt nitrate are dissolved in deionized water at a molar ratio of 9:1 to form a metal salt solution, and the total molar concentration of the metal salt solution is 0.15 mol / L;

[0026] Second step: add L-ascorbic acid to the above metal salt solution, so that the molar ratio of metal salt to L-ascorbic acid is 1:0.5;

[0027] The third step is to dilute the concentrated ammonia water and deionized water at a volume ratio of 1:19 to obtain a dilute ammonia so...

Embodiment 2

[0031] A chromium-cobalt-based nitrogen monoxide catalyst at normal temperature and pressure, prepared according to the following steps:

[0032] In the first step, chromium nitrate and cobalt nitrate are dissolved in deionized water in a molar ratio of 7:3 to form a metal salt solution, and the total molar concentration of the metal salt solution is 0.15 mol / L;

[0033] Second step: add L-ascorbic acid to the above metal salt solution, so that the molar ratio of metal salt to L-ascorbic acid is 1:0.5;

[0034] The third step is to dilute the concentrated ammonia water and deionized water at a volume ratio of 1:19 to obtain a dilute ammonia solution;

[0035] In the fourth step, the dilute ammonia solution in the third step is added dropwise to the metal salt solution in step 1, and the stirring is continued for 10-30 min, wherein the volume ratio of the dilute ammonia solution to the metal salt solution is 2:5;

[0036] In the fifth step, concentrated ammonia water is added ...

Embodiment 3

[0038] A chromium-cobalt-based nitrogen monoxide catalyst at normal temperature and pressure, prepared according to the following steps:

[0039] In the first step, chromium nitrate and cobalt nitrate are dissolved in deionized water in a molar ratio of 5:5 to form a metal salt solution, and the total molar concentration of the metal salt solution is 0.15 mol / L;

[0040] Second step: add L-ascorbic acid to the above metal salt solution, so that the molar ratio of metal salt to L-ascorbic acid is 1:0.5;

[0041] The third step is to dilute the concentrated ammonia water and deionized water at a volume ratio of 1:19 to obtain a dilute ammonia solution;

[0042] In the fourth step, the dilute ammonia solution in the third step is added dropwise to the metal salt solution in step 1, and the stirring is continued for 10-30 min, wherein the volume ratio of the dilute ammonia solution to the metal salt solution is 2:5;

[0043] In the fifth step, concentrated ammonia water is added ...

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Abstract

The invention discloses a chromium-cobalt-based nitric oxide normal-temperature normal-pressure catalyst, and a preparation method and an application thereof. The chromium-cobalt-based nitric oxide normal-temperature normal-pressure catalyst is prepared by adopting an optimized coprecipitation technology, and the surface physicochemical properties of the chromium-cobalt-based catalyst are regulated by introducing a small amount of L-ascorbic acid in the precipitation process in order to improve the nitric oxide normal-temperature normal-pressure catalysis performance. The chromium-cobalt-basedcatalyst has the characteristics of good NO normal-temperature oxidation activity, high stability and the like. The preparation method has the advantages of simplicity, easiness in large-scale production, and excellent application prospect.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a preparation method of a chromium-cobalt-based nitric oxide catalyst at normal temperature and pressure, as well as its preparation method and application. Background technique [0002] Nitrogen oxides can form acid rain and acid fog; form photochemical smog with hydrocarbons; participate in the destruction of the ozone layer, etc., causing great harm to the ecological environment and human health. The country has formulated a series of strict emission standards for NOx emissions, and has also achieved certain results in industrial exhaust gas treatment. But despite this, low-concentration NOx emissions will still cause damage to humans and the environment when they accumulate to a certain concentration in the atmosphere. Therefore, it is urgent to develop low-concentration, even low-concentration NOx treatment technologies at room temperature. [0003] The main compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01D53/86B01D53/56
CPCB01J23/864B01D53/8628B01D53/56
Inventor 崔大祥赵昆峰童琴孙瑞涛蔡婷袁静金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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