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Plate-type denitration catalyst with synergy of low SO2/SO3 conversion rate and demercuration and preparation method of denitration catalyst

A denitration catalyst, low conversion technology, applied in the field of environmental protection catalytic materials and air pollution control, can solve the problems of difficult industrial application, high denitration and mercury removal efficiency, poor oxidation efficiency, etc., to reduce surface roughness and SO2/SO3. High conversion rate, high denitration and mercury removal efficiency, excellent sulfur resistance effect

Active Publication Date: 2018-06-08
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above defects and deficiencies in the prior art, the present invention provides a collaborative SO 2 / SO 3 A plate-type denitration catalyst with low conversion rate and mercury removal and its preparation method. The plate-type denitration catalyst prepared by this method overcomes poor sulfur resistance, poor high-temperature mercury oxidation efficiency, and SO 2 / SO 3 The defects such as high conversion rate and difficulty in industrial application improve the synergy between oxides and reduce the density of oxygen bridges, so that the catalyst can maintain low SO on the basis of high denitrification and mercury removal performance. 2 / SO 3 conversion rate, good high temperature stability, wide temperature window, high denitrification and mercury removal efficiency, SO 2 / SO 3 Low conversion rate, simple preparation process, low cost, suitable for industrial application, suitable for denitrification and demercuration of various stationary sources and mobile sources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 999g of titanium dioxide powder and 1g of silicon dioxide powder, and mix them evenly;

[0027](2) Weigh 4.34g ferric nitrate nonahydrate, 0.4g aluminum nitrate nonahydrate, and 0.32g zinc nitrate hexahydrate, dissolve them in methanesulfonic acid with a mass concentration of 0.5%, add 100% ethanol solution, mix well, and let stand . Pour into the uniform powder in step (1), stir evenly, dry at 120°C for 0.1h, roast at 650°C for 0.5h, and grind to 100 mesh;

[0028] (3) Add 200 mesh 0.5g tungsten oxide and 500 mesh 0.5g cerium oxide to the modified carrier in step (2), and mix well;

[0029] (4) Weigh 0.89g ammonium metavanadate, 0.31g ferric nitrate nonahydrate, 0.14g ammonium molybdate, 0.19g copper nitrate hexahydrate, dissolve in 1% sulfamic acid solution, add 0.1% methanol solution, and Stir to prepare vanadium-iron-molybdenum-copper solution and let it stand;

[0030] (5) Add the mixed solution in step (4) to the mixed powder in step (3), stir evenly,...

Embodiment 2

[0035] (1) Weigh 909g of titanium dioxide powder and 91g of silicon dioxide powder, and mix them evenly;

[0036] (2) Weigh 0.19g of ferric chloride hexahydrate, 0.95g of aluminum trichloride, and 0.97g of zinc chloride, dissolve them in citric acid with a mass concentration of 10%, add 50% ethanol solution, mix well, and let stand. Pour into the uniform powder in step (1), stir evenly, dry at 60°C for 10 hours, roast at 350°C for 24 hours, and grind to 1000 mesh;

[0037] (3) Add 1000 mesh 10g tungsten oxide and 10 mesh 0.5g lanthanum oxide to the modified carrier in step (2), and mix well;

[0038] (4) Weigh 0.07g ammonium alum sulfate, 0.86g iron sulfate, 0.66g molybdenum phosphate, 0.34g copper sulfate, dissolve in 10% acetic acid solution, add 10% methanol solution, and prepare vanadium iron molybdenum copper solution by uniform stirring , stand still;

[0039] (5) Add the mixed solution in step (4) to the mixed powder in step (3), stir evenly, add in 15% ammonia soluti...

Embodiment 3

[0044] (1) Weigh 950g of titanium dioxide powder and 50g of silicon dioxide powder, and mix them evenly;

[0045] (2) Weigh 217g of ferric nitrate nonahydrate, 20g of aluminum nitrate nonahydrate, and 16g of zinc nitrate hexahydrate, dissolve them in deionized water, add 30% ethanol solution, mix well, and let stand. Pour into the uniform powder in step (1), stir evenly, dry at 80°C for 3 hours, roast at 550°C for 2 hours, and grind to 80 mesh;

[0046] (3) Add 800 mesh 10g chromium oxide, 800 mesh 3g tantalum oxide, 100 mesh tin oxide 2g to the modified carrier in step (2), and mix well;

[0047] (4) Weigh 178g ammonium metavanadate, 62g ferric nitrate nonahydrate, 28g ammonium molybdate, 38g copper nitrate hexahydrate, dissolve in 2% citric acid solution, add 3% isopropanol solution, and prepare vanadium by uniform stirring Iron molybdenum copper solution, stand still;

[0048] (5) Add the mixed solution in step (4) to the mixed powder in step (3), stir evenly and add it t...

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Abstract

The invention provides a plate-type denitration catalyst with the synergy of low SO2 / SO3 conversion rate and demercuration. The denitration catalyst comprises carriers, a carrier modifier, an active component, a co-catalyst and a functional auxiliary agent; the carriers are anatase-type titanium dioxide powder and silicon dioxide powder, the carrier modifier is an iron-aluminum-zinc composite oxide, and the active component is a vanadium-iron-molybdenum-copper composite oxide, wherein the mass ratio of the carriers to the carrier modifier to the active component to the co-catalyst to the functional auxiliary agent is 100:(0.1-5):(0.1-20):(0.1-20):(0.1-2), the mass ratio of the titanium dioxide to the silicon dioxide in the carrier is 100:(0.1-10), and the molar ratio of iron element to thealuminum element to the zinc element in the carrier modifier is 1:(0.1-10):(0.1-10). The catalyst has the characteristics of excellent sulfur resistance and water resistance, wide temperature windowwidth, high denitration and demercuration efficiency, low SO2 / SO3 conversion rate and the like. In addition, the invention also provides a method for preparing the catalyst.

Description

technical field [0001] The present invention relates to a collaborative SO 2 / SO 3 The invention discloses a plate-type denitrification catalyst with low conversion rate and mercury removal and a preparation method thereof, belonging to the fields of environmental protection catalytic materials and air pollution control. Background technique [0002] Mercury is a serious threat to human life and health, which has attracted great attention from all countries in the world. To this end, the United States promulgated the world's first limit value standard for mercury emissions from coal-fired power plants in 2005. In 2013, the United Nations adopted the Minamata Convention, the world's first mercury emission reduction convention, which requires countries to limit mercury emissions from mercury-emitting enterprises, including coal-fired power plants. my country attaches great importance to the prevention and control of mercury pollution, and for the first time stipulated in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J37/04B01J37/08B01J35/10B01D53/86B01D53/60
CPCB01D53/86B01D53/8637B01D53/8665B01J31/38B01J37/04B01J37/08B01D2257/602B01D2257/40B01D2257/302B01J35/613B01J35/615
Inventor 纵宇浩池桂龙王虎黄力陈志平李倩
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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