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Low-temperature SCR flue gas denitrification catalyst and preparation method and application thereof

A denitration catalyst, catalyst technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of narrow activity window, high onset temperature, low temperature denitration efficiency, etc. The effect of inhibiting hydrolysis, improving the degree of dispersion, and good NOx removal rate

Inactive Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a low-temperature SCR flue gas denitrification catalyst and its preparation method and application in order to overcome the problems of high catalyst onset temperature, narrow activity window and low low-temperature denitrification efficiency in the prior art. It has excellent SCR catalytic activity in a wide temperature window of 140-240°C, and has a good NOx removal rate in the low temperature range of 140-240°C; in addition, the active component of the catalyst is a vanadium-free metal oxide, which can It has positive significance in terms of pollution and secondary pollution of catalyst waste

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  • Low-temperature SCR flue gas denitrification catalyst and preparation method and application thereof
  • Low-temperature SCR flue gas denitrification catalyst and preparation method and application thereof

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preparation example Construction

[0025] Another aspect of the present invention provides a method for preparing a low-temperature SCR flue gas denitrification catalyst, wherein the method comprises the following steps:

[0026] (1) Mix oxalic acid, manganese salt, iron salt and water;

[0027] (2) dispersing nano-titanium dioxide in the metal oxalate double salt precursor solution mixed in step (1) and carrying out wet impregnation;

[0028] (3) Calcining the reaction mixture after step (2).

[0029] According to the present invention, based on the total weight of the catalyst, the amount of the carrier can be 85-98% by weight, preferably 90-96% by weight; and in terms of elements, the Fe element in the iron salt and the The molar ratio of the amount of Mn element in the manganese salt can be 1:0.5-2, preferably 1:1-1.5; and the molar ratio of the amount of the iron salt to the oxalic acid is 1:2-4, preferably 1:2.5-3.5, more preferably 1:3.

[0030] According to the present invention, the iron salt can be...

Embodiment 1

[0049] This example is to illustrate the preparation method of the low-temperature SCR flue gas denitrification catalyst provided by the present invention.

[0050] (1) Preparation of the impregnating solution: Weigh the solid oxalic acid and fully dissolve it in deionized water, add the solid ferric nitrate nonahydrate to obtain a yellow-green solution. After fully stirring for 30 minutes, add a manganese nitrate aqueous solution with a concentration of 50% by weight, and fully stir to obtain a clear and transparent dipping solution, wherein, in terms of elements, the Fe element in the iron nitrate nonahydrate and the Mn element in the manganese nitrate The molar ratio of the amount of the iron salt to the oxalic acid is 1:1.5; and the molar ratio of the amount of the iron salt to the oxalic acid is 1:3.

[0051] (2) Dispersion and impregnation of the carrier: add P25 nano-titanium dioxide in the impregnation solution obtained in step (1), wherein, based on the total weight o...

Embodiment 2

[0054] This example is to illustrate the preparation method of the low-temperature SCR flue gas denitrification catalyst provided by the present invention.

[0055] (1) Preparation of the impregnating solution: Weigh the solid oxalic acid and fully dissolve it in deionized water, add the solid ferric nitrate nonahydrate to obtain a yellow-green solution. After fully stirring for 30 minutes, add 50% by weight of manganese nitrate aqueous solution, and fully stir to obtain a clear and transparent impregnation solution, wherein, in terms of elements, the amount of the Fe element in the iron nitrate nonahydrate and the Mn element in the manganese nitrate The molar ratio of the iron salt to the oxalic acid and water is 1:3.

[0056] (2) Dispersion and impregnation of the carrier: add P25 nano-titanium dioxide in the impregnation solution obtained in step (1), wherein, based on the total weight of the catalyst, the amount of the carrier can be 91% by weight, and then Stir and impre...

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Abstract

The invention belongs to the technical field of environmental protection and catalysis, and discloses a low-temperature SCR flue gas denitrification catalyst and a preparation method and application thereof. The catalyst comprises a carrier, a first metallic oxide and a second metallic oxide, wherein the first metallic oxide and the second metallic oxide are immobilized on the carrier, the carrierrefers to nanometer titanium dioxide, the first metallic oxide refers to a Fe oxide, and the second metallic oxide is a Mn oxide. The catalyst has an excellent SCR catalytic activity in a wide-temperature (from 140 DEG C to 240 DEG C) window, and has a high NOx removal rate in the low-temperature range from 140 DEG C to 240 DEG C. Besides, the vanadium-free metallic oxides serve as the active components of the catalyst, and the catalyst has a positive significance in control over environmental pollution and secondary pollution of catalyst wastes.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and catalysis, and in particular relates to a low-temperature SCR flue gas denitrification catalyst and its preparation method and application. Background technique [0002] Since the beginning of the 21st century, the extensive use of fossil energy has made the environmental problems faced by human beings more and more severe. Nitrogen oxides (NOx) are one of the main pollutants widely present in the atmosphere. Its existence will cause major environmental problems such as photochemical smog, acid rain, greenhouse effect and ozone layer destruction. It also has biological respiratory toxicity and is harmful to the ecological environment and human health. caused great harm. Therefore, how to effectively remove NOx has become a key issue in environmental protection today. NOx mainly comes from coal-fired power plants, thermal power plants, various industrial and civil boilers, an...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J23/002B01J23/8892B01J2523/00B01J2523/47B01J2523/72B01J2523/842
Inventor 褚昱昊刘晓玲张明森
Owner CHINA PETROLEUM & CHEM CORP
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