Preparation method, product and application of high-efficiency treatment catalyst for ferrochromium-based nitric oxide at room temperature and pressure

A nitric oxide and catalyst technology, which is applied in the field of high-efficiency treatment of ferrochromium-based nitric oxide at room temperature and pressure, can solve the problems of difficult desorption, restrict the catalytic performance and service life of the catalyst, and achieve accelerated desorption rate, The effect of good oxidation activity at room temperature and simple preparation method

Active Publication Date: 2022-07-26
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

[0020] A chromium-iron-based high-efficiency treatment catalyst for nitric oxide at normal temperature and normal pressure is prepared by adopting an optimized co-precipitation method according to the following steps:

[0021] The first step is to dissolve chromium sulfate and ferric sulfate with a molar ratio of 9:1 in deionized water to form a metal salt solution, and the total molar concentration of the metal salt solution is 0.15 mol / L;

[0022] Second step: add potassium sulfate in above-mentioned metal salt solution, the mol ratio of metal salt and potassium sulfate is 1:0.1;

[0023] In the third step, concentrated ammonia water was added dropwise to adjust the pH to about 9, reacted for 5h, suction filtered, dried at 50-100°C, and calcined at 400°C for 4h to obtain Cr9Fe1-400.

Embodiment 2

[0025] A chromium-iron-based high-efficiency treatment catalyst for nitric oxide at room temperature and normal pressure is prepared according to the following steps:

[0026] The first step is to dissolve chromium sulfate and ferric sulfate with a molar ratio of 7:3 in deionized water to form a metal salt solution, and the total molar concentration of the metal salt solution is 0.15 mol / L;

[0027] Second step: add potassium sulfate in above-mentioned metal salt solution, the mol ratio of metal salt and potassium sulfate is 1:0.1;

[0028] In the third step, concentrated ammonia water was added dropwise to adjust the pH to about 9, reacted for 5h, suction filtered, dried at 50-100°C, and calcined at 400°C for 4h to obtain Cr7Fe3-400.

Embodiment 3

[0030] A chromium-iron-based high-efficiency treatment catalyst for nitric oxide at room temperature and normal pressure is prepared according to the following steps:

[0031] The first step is to dissolve chromium sulfate and ferric sulfate with a molar ratio of 5:5 in deionized water to form a metal salt solution, and the total molar concentration of the metal salt solution is 0.15 mol / L;

[0032] Second step: add the potassium sulfate of specific ratio in above-mentioned metal salt solution, the mol ratio of metal salt and potassium sulfate is 1:0.1;

[0033] In the third step, concentrated ammonia water was added dropwise to adjust the pH to about 9, reacted for 5h, suction filtered, dried at 50-100°C, and calcined at 400°C for 4h to obtain Cr5Fe5-400.

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Abstract

The invention discloses a preparation method of a chromium-iron-based nitric oxide high-efficiency treatment catalyst at normal temperature and normal pressure, its product and application, which are prepared by a co-precipitation method. A small amount of potassium sulfate was introduced in situ during the precipitation process, and after subsequent calcination, the structure of the catalyst surface and interface was reconstructed, the physical and chemical properties of the surface and interface were adjusted, and the catalyst surface was reduced to the oxidation product NO. 2 The adsorption energy accelerates its desorption rate on the catalyst surface and improves the catalytic performance of nitric oxide at room temperature and pressure. The chromium-iron-based catalyst obtained by the invention has the characteristics of good NO oxidation activity at room temperature and high stability. The preparation method is simple, easy for large-scale production, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a preparation method of a chromium-iron-based nitric oxide high-efficiency treatment catalyst at room temperature and normal pressure, its product and application. Background technique [0002] The pollution of nitrogen oxides to the environment is a global problem. 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. According to statistics, about 53 million tons of NOx are emitted to the atmosphere by human activities every year, mainly NO and NO 2 . And NO accounts for 95% of NOx in typical coal-fired flue gas, so the control of NO, especially the control of atmospheric ambient temperature, that is, room temperature is particularly important. [0003] The current main treatment methods, such as selective ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/86B01D53/56B01D53/86
CPCB01J23/862B01D53/56B01D53/8628
Inventor 崔大祥赵昆峰童琴蔡婷袁静金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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