Low-temperature SO2-resistant MnxSby/PG-type SCR denitration catalyst and preparation method thereof

A denitrification catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as high energy consumption and complex processes, and achieve strong adsorption ability, low cost, good thermal stability and formability

Inactive Publication Date: 2015-11-04
FUJIAN ZIJIN ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional SCR catalysts use TiO 2 as the carrier, V 2 o 5 It is an active component, W or Mo is an additive, and its working temperature is 300-400 ° C. However, when it is applied to an actual boiler with a lower flue gas temperature, it faces problems such as complex process and huge energy consumption.

Method used

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  • Low-temperature SO2-resistant MnxSby/PG-type SCR denitration catalyst and preparation method thereof
  • Low-temperature SO2-resistant MnxSby/PG-type SCR denitration catalyst and preparation method thereof
  • Low-temperature SO2-resistant MnxSby/PG-type SCR denitration catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: The denitration catalyst described in this embodiment has the following main components:

[0031] Active component: manganese nitrate, 8 parts by weight;

[0032] Add metal: one of Sb, Mo, La, W and Mg, 1 part by weight;

[0033] Carrier: attapulgite (PG), 100 parts by weight.

[0034] The preparation method of the denitration catalyst is as follows:

[0035] (1) Weigh manganese nitrate and another metal acetate according to the ratio of Mn:M=8:1 (M is one of Sb, Mo, La, W and Mg), and dissolve them in a mass concentration of 50 % citric acid solution, make MnO x and another metal oxide accounted for 4wt% and 0.5wt% of the catalyst respectively, and after the solution was fully dissolved, they were mixed into an active solution for later use;

[0036](2) Select attapulgite PG of 20-40 mesh as the carrier, add 92wt% PG, water, and ammonia water with a mass concentration of 15% to the mixer at a speed of 100rpm, and then add 0.5% at a mass ratio of 1:5 ...

Embodiment 2

[0042] Embodiment 2: The denitration catalyst described in this embodiment has the following main components:

[0043] Active ingredient: manganese nitrate, 8 parts by weight;

[0044] Add metal: Sb, respectively 0, 1, 3, 5, 7, 9 parts by weight;

[0045] Carrier: attapulgite (PG).

[0046] The preparation method of the denitration catalyst is as follows:

[0047] (1) Weigh a certain amount of manganese nitrate and antimony acetate according to Mn:Sb=8:x (x is 0, 1, 3, 5, 7, 9), and dissolve them in citric acid solution with a mass concentration of 50% , making MnO x and Sb 2 o 5 Accounting for 4wt% of the catalyst, (0, 0.5, 1.5, 2.5, 3.5, 4.5)wt%, respectively, after the solution is fully dissolved, mix it into an active solution for later use;

[0048] (2) (2) Select 20-40 mesh attapulgite PG as the carrier, add (92.5, 92, 91, 90, 89, 88) wt% of PG, water, and ammonia water with a mass concentration of 15% at a speed of 100rpm Put down the mixer, then add 0.5wt% stear...

Embodiment 3

[0055] A series of Mn prepared in embodiment 2 8 Sb x / PG (x=0, 1, 3, 5, 7, 9) catalysts were analyzed by XRD and obtained image 3 . Such as image 3 As shown, all catalysts show MnO at 2θ=37.6, 42.8, 57.0 2 characteristic diffraction peaks. Antimony-based catalysts and Mn 8 / PG exhibited lower peaks, which could be assigned to the nature of small grains forming solids. In addition, when the antimony content continues to increase, the corresponding MnO 2 The characteristic peaks at 2θ = 37.6, 42.8, and 57.0 weaken order, indicating that manganese oxides are gradually highly dispersed on the catalyst surface, and manganese oxide crystal structures have been proposed to improve the presence of oxygen vacancies and enhance catalyst performance. Furthermore, for all catalysts, no antimony oxide crystallites were detected, which indicated that antimony oxide was highly dispersed on the surface of the PG support.

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Abstract

The invention discloses a low-temperature SO2-resistant MnxSby / PG-type SCR denitration catalyst. The catalyst comprises 0.5-4wt% of MnOx as an active ingredient, 0.5-5wt% of Sb2O5 as an assistant, 85-95wt% of attapulgite PG as a carrier, 2-6wt% of glass fibers and methyl cellulose as molding materials, wherein a mass ratio of the glass fibers to the methyl cellulose is (4-30): 1, and 0.1-1wt% of stearic acid and lactic acid as lubricants, wherein a mass ratio of stearic acid to lactic acid is 1: (2-10). The invention also discloses a preparation method of the catalyst. The catalyst has high efficiency low-temperature SCR denitration efficiency, strong SO2-resistant performances and high catalyst reaction activity at a low reaction temperature and can inhibit catalyst SO2 poisoning.

Description

technical field [0001] The invention belongs to boiler flue gas NH 3 -The preparation technical field of SCR denitrification catalyst, be specifically related to a kind of low-temperature anti-SO 2 Mn x Sb y / PG type SCR denitrification catalyst and preparation method thereof, for realizing high NO at low temperature x Optimal removal rate of SCR denitrification catalyst, and mitigation catalyst SO 2 Poisoning problem. Background technique [0002] SO 2 It is a common gas discharged from industrial boilers, and SO also needs to be treated in the SCR denitrification reaction of coal-fired boilers 2 , in the process, SO 2 Converted to SO by catalytic oxidation 3 , SO 3 with escape NH 3 The formed ammonium sulfate salt will not only cause corrosion and blockage of subsequent equipment, but more seriously, it will cover the surface of the low-temperature SCR catalyst, block the catalytic active site, reduce the catalytic activity, and even SO 3 Metal oxides with act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16B01J23/30B01D53/86B01D53/56
Inventor 王洪明黄丽明杨广华林苏芳
Owner FUJIAN ZIJIN ENVIRONMENT ENG TECH
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