Forming SCR catalyst with both water resistance and sulphur resistance and preparation method thereof

A technology of catalyst and denitrification catalyst, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of unfavorable industrial application and cumbersome preparation process, and achieve industrial operation, not easy to break, and good deliquescence resistance performance effect

Inactive Publication Date: 2015-04-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the whole preparation process is cumbersome, and the prepared catalyst is granular, which is not conducive to industrial application

Method used

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  • Forming SCR catalyst with both water resistance and sulphur resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of low-temperature SCR denitrification catalyst

[0036] (1) Dry mixing: take 400g carrier anatase TiO 2 , 8gWO 3 , 358g manganese oxalate, 260.4g, cerium nitrate, 42.9g zirconium nitrate, 87.3g cobalt nitrate (weighed first, and then placed in an oven for 48h at 120°C) and other active material precursor powders and 10g stearic acid, 20g Activated carbon, 10g pseudo-boehmite, etc. were put into a kneader and dry-mixed for 45 minutes to obtain a uniformly mixed powder;

[0037] (2) Wet mixing granulation: add 50g of glass fiber and 5g of pulp cotton to the powder, stir for 15min to combine the material into a filament, then add glycerin evenly for several times and spray misty deionized water, glycerin and deionized water The total amount of ionized water is 20g and 30g respectively, so that the materials are gradually combined to form granules, and the time is 30min;

[0038] (3) Wet mixing: continue to add liquid glycerin and mist deionized water to ...

Embodiment 2

[0050] 1. Preparation of low-temperature SCR denitrification catalyst

[0051] Change the 87.3g cobalt nitrate quality into 29.1g in the catalyst formula of embodiment 1, the add-on of deionized water becomes 20g in the wet mixing granulation process, the deionized water add-on becomes 60g in the wet mixing granulation process, other formula materials and The preparation method is consistent with Example 1.

[0052] 2. Mechanical performance test

[0053] The test conditions were the same as in Example 1, and the measured longitudinal mechanical strength of the catalyst was 1.7 MPa.

[0054] 3. Catalyst activity test

[0055] The test conditions were the same as in Example 1. After 8 hours of testing, the conversion rate of NO decreased from 99% to 44%, and tended to balance.

Embodiment 3

[0057] 1. Preparation of low-temperature SCR denitrification catalyst

[0058] Change the 87.3g cobalt nitrate quality into 174.6g in the catalyst formula of embodiment 1, the add-on of deionized water becomes 10g in the wet mixing granulation process, the deionized water add-on becomes 20g in the wet mixing granulation process, other formula materials and The preparation method is consistent with Example 1.

[0059] 2. Mechanical performance test

[0060] The test conditions were the same as in Example 1, and the measured longitudinal mechanical strength of the catalyst was 1.4 MPa.

[0061] 3. Catalyst activity test

[0062] The test conditions were the same as in Example 1. After 19 hours of continuous testing, the conversion rate of NO decreased from 93% to 49.6%, and tended to be stable.

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Abstract

The invention discloses a forming SCR catalyst with both water resistance and sulphur resistance. According to the forming SCR catalyst, anatase TiO2 is taken as a carrier, the active ingredients are cerium, manganese and cobalt and is added with one or more elements of zirconium, tungsten and tin to form a composite oxide Ce-Mn-Co-X / TiO2, wherein the molar ratio of Ti: Mn: Ce: CO: X is equal to 1: (0.1-2): (0.05-2): (0.05-2): (0.1-2), and X is one or more elements of zirconium, tungsten and tin. The invention further discloses a preparation process of the catalyst, wherein the catalyst is prepared by an overall extrusion method through one-step forming, and the prepared catalyst has excellent denitration performance and good water resistance and sulphur resistance at a temperature of 90-150 DEG C, and can be used for denitration of tail flue gas with high vapour content and low SO2 content from a cement kiln furnace.

Description

technical field [0001] The invention belongs to the field of air pollution control, and relates to a molded SCR catalyst capable of simultaneously resisting water and sulfur under low temperature conditions and a preparation method thereof, which is suitable for purification treatment of cement kiln tail gas. Background technique [0002] Our country is NO x As a country with large emissions, the emission sources are mainly concentrated in thermal power generation, transportation and cement industry. Among them, thermal power generation is the largest NO x Emission sources have attracted much attention. After a long period of research and development, the flue gas denitrification technology for this field has been very mature. Driven by increasingly stringent implementation standards in the transportation industry, three-way catalysts and diesel vehicle catalytic technologies have been greatly developed. NO x Emissions have also been effectively controlled. And as the th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 刘越马昊吴忠标王海强翁小乐
Owner ZHEJIANG UNIV
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