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A kind of anti-arsenic poisoning SCR denitrification catalyst and preparation method thereof

A denitrification catalyst and arsenic poisoning technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as poor activity, short life, and rapid reduction in denitrification efficiency, and achieve extended life and inhibition depth Poisoning, the effect of improving the ability to resist arsenic poisoning

Active Publication Date: 2019-09-24
河南康宁特环保科技股份有限公司
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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 SCR denitrification catalyst resistant to arsenic poisoning, which overcomes the problems of the denitrification catalyst in the prior art that the denitrification efficiency of the catalyst decreases rapidly in the arsenic-containing flue gas, the activity is poor, and the service life is short

Method used

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  • A kind of anti-arsenic poisoning SCR denitrification catalyst and preparation method thereof

Examples

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Embodiment 1

[0028] A method for preparing an anti-arsenic poisoning SCR denitration catalyst includes the following steps:

[0029] (1) Mix ammonium metavanadate, ammonium molybdate and bismuth nitrate to obtain an active raw material; the mass ratio of vanadium, molybdenum and bismuth in the active raw material is 0.83:6.66:3.59;

[0030] (2) Mix the active raw material obtained in step (1) with citric acid in a mass ratio of 1:2, grind for 30 minutes, then dry at 80°C for 8 hours, and calcinate at 400°C for 6 hours to obtain active powder;

[0031] (3) Prepare a mixed mud which is made by mixing the following raw materials according to mass percentages: 15 parts of active powder obtained in step (2), 10 parts of structural additives, 0.1 part of tung oil, 2 parts of silica sol, 0.1 part of methyl cellulose, 2 parts of glass fiber, 73 parts of titanium dioxide and 45 parts of deionized water; wherein, the structural aid is obtained by mixing calcium oxide and tin oxide in a mass ratio of 1:1;

...

Embodiment 2

[0036] A method for preparing an anti-arsenic poisoning SCR denitration catalyst includes the following steps:

[0037] (1) Mix ammonium metavanadate, ammonium molybdate and bismuth nitrate to obtain an active raw material; the mass ratio of vanadium, molybdenum and bismuth in the active raw material is 0.056:3.33:4.48;

[0038] (2) Mix the active raw materials obtained in step (1) with citric acid in a mass ratio of 1:4, grind for 90 minutes, then dry at 100°C for 6 hours, and calcinate at 600°C for 4 hours to obtain active powder;

[0039] (3) Prepare a mixed mud, the mixed mud is made by mixing the following raw materials according to mass percentage: 10 parts of the active powder obtained in step (1), 18 parts of structural additives, 0.5 parts of tung oil, 3 parts of silica sol, 0.05 parts of methyl cellulose, 6 parts of glass fiber, 66 parts of titanium dioxide and 55 parts of deionized water; wherein, the structural aid is obtained by mixing calcium nitrate and tin nitrate in ...

Embodiment 3

[0044] A method for preparing an anti-arsenic poisoning SCR denitration catalyst includes the following steps:

[0045] (1) Mix ammonium metavanadate, ammonium molybdate and indium chloride to obtain an active raw material; the mass ratio of vanadium, molybdenum and indium in the active raw material is 0.056:3.33:1.65;

[0046] (2) Mix the active raw material obtained in step (1) with citric acid in a mass ratio of 1:3, grind for 30 minutes, then dry at 80°C for 8 hours, and calcinate at 400°C for 6 hours to obtain active powder;

[0047] (3) Prepare a mixed mud, the mixed mud is made by mixing the following raw materials according to mass percentage: 7 parts of active powder obtained in step (1), 18 parts of structural additives, 0.1 part of tung oil, 1 part of silica sol, 0.05 parts of methyl cellulose, 2 parts of glass fiber, 73 parts of titanium dioxide and 50 parts of deionized water; wherein, the structural aid is obtained by mixing calcium chloride and tin chloride in a mass r...

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Abstract

The invention discloses an anti-arsenic-poisoning SCR denitration catalyst and a preparation method thereof. On the basis of titanium dioxide, vanadium pentoxide and molybdenum trioxide are used as basic active components; a bismuth additive or indium additive is used as an anti-arsenic additive; structural additives resistant to arsenic poisoning are added at the same time and are composed of a calcium additive and a tin additive; the active additive can protect the basic active components and effectively prevents inactivation of the basic active components under the condition of arsenic-containing flue gas; and the structural additives can prevent arsenic from deposition and aggregation on the surface of the SCR denitration catalyst, inhibit deep poisoning caused by arsenic-containing flue gas and improve the anti-arsenic-poisoning capability of the SCR denitration catalyst. The SCR denitration catalyst prepared in the invention can maintain high denitration efficiency and is prolonged in service life.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and specifically relates to an SCR denitration catalyst resistant to arsenic poisoning and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are one of the main atmospheric pollutants that cause acid rain, photochemical smog, and ozone layer destruction, and cause serious harm to human health and the ecological environment. Among them, NH 3 The selective catalytic reduction of NOx as a reducing agent is currently the most widely used and most mature denitration technology. [0003] At present, the widely used denitration catalyst is honeycomb commercial V 2 O 5 -WO 3 / TiO 2 Base catalyst or V 2 O 5 -MoO 3 / TiO 2 Base catalyst. When the denitration catalyst is in use, the temperature environment is 300~420℃, and most of them are arranged with high dust content. The catalyst has been in the flue gas containing fly ash, SOx, alkali metals (K, Na, etc.) and Hg, As for a lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01D53/86B01D53/56
Inventor 张涛
Owner 河南康宁特环保科技股份有限公司
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