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Low-temperature flue gas SCR (Selective Catalytic Reduction) denitrating catalyst and preparation method and application thereof

A denitration catalyst, low temperature flue gas technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can maintain high active phase, high specific surface area and avoid serious loss of slurry.

Active Publication Date: 2011-04-20
ZHEJIANG UNIV OF TECH
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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 method for in-situ loading of catalysts on the surface of honeycomb cordierite carriers for the shortcomings of complex process, high cost, and poor loading uniformity and adhesion of catalyst surface active components in the preparation technology of monolithic Mn-Ti series catalysts. The preparation method does not need to prepare slurry and binder, and the active components can be highly dispersed on the surface of cordierite, and the catalyst active layer formed on the surface has high adhesion and uniformity

Method used

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  • Low-temperature flue gas SCR (Selective Catalytic Reduction) denitrating catalyst and preparation method and application thereof
  • Low-temperature flue gas SCR (Selective Catalytic Reduction) denitrating catalyst and preparation method and application thereof
  • Low-temperature flue gas SCR (Selective Catalytic Reduction) denitrating catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take 2.5g of cordierite honeycomb ceramics (Φ10mm×50mm, pore diameter 3mm), completely immersed in 1wt% nitric acid solution for 60 minutes, then rinse the cordierite with deionized water to remove surface impurities, put it into an oven at 110 After drying at ℃ for 12 hours, the surface-activated cordierite honeycomb ceramics were obtained for future use.

[0032] Get 30wt% silica sol 20.0g, titanyl sulfate (TiOSO 4 2H 2 (2) 30.0g was dissolved in 150ml of water to obtain a coating impregnation solution. The surface-activated cordierite honeycomb ceramics was completely immersed in the coating impregnation solution for 20 minutes, the cordierite was taken out, and the flow on the surface was blown off with a high-pressure air gun. The droplets were then dried at 110°C for 30 minutes. The dried cordierite was completely immersed in 25 wt% ammonia water for 20 minutes to carry out in-situ hydrolysis precipitation. After taking it out, blow off the ammonia water drople...

Embodiment 2

[0035] Take 2.5g of cordierite honeycomb ceramics (Φ10mm×50mm, pore diameter 3mm), completely immerse in 5wt% nitric acid solution for 60 minutes, then rinse the cordierite with deionized water, wash away the surface impurities, put it into an oven at 80 After drying at ℃ for 12 hours, the surface-activated cordierite honeycomb ceramics were obtained for future use.

[0036] Get 30wt% silica sol 60.0g, titanyl sulfate (TiOSO 4 2H 2 (2) 30.0g was dissolved in 150ml of water to obtain a coating impregnation solution. The surface-activated cordierite honeycomb ceramics was completely immersed in the coating impregnation solution for 20 minutes, the cordierite was taken out, and the flow on the surface was blown off with a high-pressure air gun. The droplets were then dried at 60°C for 100 minutes. The dried cordierite was completely immersed in 25 wt% ammonia water for 10 minutes to carry out in-situ hydrolysis precipitation. After taking it out, blow off the ammonia water dro...

Embodiment 3

[0039] Take 2.5g of cordierite honeycomb ceramics (Φ10mm×50mm, pore diameter 3mm), completely submerged in 1wt% nitric acid solution for 60 minutes, then rinse the cordierite with deionized water to remove surface impurities, put it into an oven at 150 Dry at ℃ for 3 hours to obtain a surface-activated cordierite honeycomb ceramic for future use.

[0040] Get 30wt% silica sol 3.1g, titanyl sulfate (TiOSO 4 2H 2 (2) 30.0g was dissolved in 150ml of water to obtain a coating impregnation solution. The surface-activated cordierite honeycomb ceramics was completely immersed in the coating impregnation solution for 20 minutes, the cordierite was taken out, and the flow on the surface was blown off with a high-pressure air gun. The droplets are then dried at 120 for 10 minutes. The dried cordierite was completely immersed in 5wt% ammonia water for 60 minutes to carry out in-situ hydrolysis precipitation. After taking it out, blow off the ammonia water droplets on the surface with ...

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Abstract

The invention discloses a low-temperature flue gas SCR (Selective Catalytic Reduction) denitrating catalyst, comprising a carrier and an active component loaded on the carrier, wherein the carrier is cordierite honeycomb ceramic loaded with a TiO2-SiO2 coating; the ratio of the amount of substances of Ti to Si in the TiO2-SiO2 coating is 1:0.1-2.0; the active component is an oxide composed of Mn,Fe, Ce, Zr, and W; the loading amount of the active component is 2-20 wt%; the ratio of the amount of substances of Mn to Fe to Ce to Zr to W in the active component is 1.0:0.1-2.0:0.1-2.0:0.02-1.0:0.01-1.0. In the invention, a uniform and firm TiO2-SiO2 coating is formed by using in situ precipitation method; the obtained coating has high specific surface area and appropriate acid strength, and can effectively play promoting catalytic action role; and the active component can be prepared by using in situ coprecipitation method. The preparation process avoids the problems that the seriflux isin serious loss and the coating is not uniform during the suspension dip-coating, and maintains the highly activity phase of the composite oxide.

Description

(1) Technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a 2 -SiO 2 Coated honeycomb ceramic cordierite as a carrier, a low-temperature flue gas SCR depinning catalyst with Mn-Fe-Ce-Zr-W composite oxide as an active component, its preparation method and its selective catalytic reduction (SCR) in flue gas application in denitrification. (2) Background technology [0002] NO X It is one of the main harmful substances that pollute the atmosphere. Coal burning produces a large amount of NO X One of the main ways, especially coal combustion in thermal power plants, accounts for about NO X 50% of emissions. Compared with other technologies, selective catalytic reduction (SCR) uses ammonia, urea and low-carbon hydrocarbons as reducing agents to selectively reduce NO in exhaust gas through catalysts X Converted to non-polluting element molecule N 2 and H 2 O, characterized by low cost and high efficiency, is curren...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/025B01D53/90B01D53/56
Inventor 卢晗锋黄海凤陈银飞周小燕
Owner ZHEJIANG UNIV OF TECH
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