Wide temperature window scr flue gas denitrification catalyst and its preparation method and application

A denitration catalyst and catalyst technology, which are applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of reducing the amount of active component vanadium, narrow active window, low temperature denitration efficiency, etc.

Active Publication Date: 2020-12-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a wide temperature window 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. The catalyst has a low starting temperature, has excellent SCR catalytic activity in a wide temperature window of 120-300°C, and has a good NOx removal rate in the middle and low temperature range (200-300°C); in addition, the catalyst reduces the active components The amount of vanadium has positive significance in controlling environmental pollution and secondary pollution of catalyst waste

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  • Wide temperature window scr flue gas denitrification catalyst and its preparation method and application
  • Wide temperature window scr flue gas denitrification catalyst and its preparation method and application

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preparation example Construction

[0032] Another aspect of the present invention provides a method for preparing a wide temperature window SCR flue gas denitrification catalyst, wherein the method comprises the following steps:

[0033] (1) Mix oxalic acid, iron salt, manganese salt and water to obtain solution A;

[0034] (2) mixing and aging oxalic acid, ammonium metavanadate and water to obtain aged vanadium precursor solution B;

[0035] (3) solution A and solution B are mixed, obtain the oxalate double salt precursor solution of metal;

[0036] (4) disperse the carrier nano-titanium dioxide in the oxalate double salt precursor solution of the metal and carry out wet impregnation;

[0037] (5) Calcining the reaction mixture after step (4).

[0038] According to the present invention, based on the total weight of the catalyst, the amount of the carrier is such that the content of the carrier in the catalyst can be 85-95% by weight, preferably 88-92% by weight.

[0039] Wherein, the molar ratio of the amoun...

Embodiment 1

[0062] This example is to illustrate the preparation method of the wide temperature window SCR flue gas denitrification catalyst provided by the present invention.

[0063] (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 min, 50% by weight of manganese nitrate aqueous solution was added, and fully stirred to obtain a clear and transparent solution A.

[0064] At the same time, the oxalic acid solid was weighed and fully dissolved in deionized water, and the ammonium metavanadate solid was added to obtain an orange-yellow solution. After fully aging at 60°C for 4 hours, a light blue solution B was obtained.

[0065] Mix A and B solutions evenly and stir well to obtain a clear and transparent impregnating solution.

[0066] Wherein, the molar ratio of the amount of ferric nitrate nonahydrate in terms of Fe e...

Embodiment 2

[0070] This example is to illustrate the preparation method of the wide temperature window SCR flue gas denitrification catalyst provided by the present invention.

[0071] (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 min, 50% by weight of manganese nitrate aqueous solution was added, and fully stirred to obtain a clear and transparent solution A.

[0072] At the same time, the oxalic acid solid was weighed and fully dissolved in deionized water, and the ammonium metavanadate solid was added to obtain an orange-yellow solution. After fully aging at 65°C for 4.5 hours, a light blue solution B was obtained.

[0073] Mix A and B solutions evenly and stir well to obtain a clear and transparent impregnating solution.

[0074] Wherein, the molar ratio of the amount of ferric nitrate nonahydrate in terms of Fe...

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Abstract

The invention belongs to the technical field of environmental protection and catalysis, and discloses an SCR flue gas denitration catalyst with a wide temperature window, a preparation method and an application of the catalyst, wherein the catalyst comprises a carrier and a first metal oxide, a second metal oxide and a third metal oxide which are supported on the carrier; the carrier is nano titanium dioxide; the first metal oxide is Fe oxide; the second metal oxide is Mn oxide; and the third metal oxide is V oxide. The catalyst has excellent SCR catalytic activity in a wide temperature windowof 120-300 DEG C, and simultaneously has excellent NOx removal rate in a low temperature section of 120-200 DEG C and a medium temperature section of 200-300 DEG C; and in addition, the active component of the catalyst has low vanadium content and has positive significance in controlling 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 wide temperature window SCR flue gas denitrification catalyst and its preparation method and application. Background technique [0002] Nitrogen oxides (NOx) are important air pollutants, which mainly come from the combustion of fossil fuels, exhaust emissions from industrial boilers, and exhaust emissions from mobile sources such as diesel engines. Acid rain and chemical smog caused by NOx are posing an increasing threat to human life. With the continuous introduction of more and more stringent emission limit standards by the environmental protection department, the control of NOx has reached the point of no delay. [0003] At present, ammonia-selective catalytic reduction technology (Ammonia-Selective Catalytic Reduction of NOx, NH 3 -SCR). The technology is to add NH at the flue gas temperature of 300-400°C 3 As a reducing agent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 褚昱昊刘晓玲张明森
Owner CHINA PETROLEUM & CHEM CORP
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