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A plate catalyst for simultaneous denitrification and mercury removal and its preparation method

A catalyst and plate-type technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low catalyst activity temperature window, catalyst deactivation, high catalytic activity, etc., and achieve a wide activation temperature window, The effect of high activity and simple preparation process

Active Publication Date: 2016-08-17
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing patents, (CN102218266) is based on TiO 2 As the support body, with V 2 o 5 The catalyst is an active component with high catalytic activity. The disadvantage is that the catalyst is a honeycomb catalyst, which is easy to cause blockage under the domestic high-ash flue gas operating conditions, resulting in catalyst deactivation.
(CN102294248) is based on TiO 2 as carrier, with MnO 2 -Fe 2 o 3 The catalyst is an active component with high catalytic activity, but the catalyst's activity temperature window is not high, which limits its application in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Take 100g of titanium dioxide, 2g of glass fiber, and 2g of carboxymethyl cellulose, and mix them evenly to obtain a uniform dry material. At 60°C, take 5g of ammonium metavanadate and 15g of ammonium metatungstate, and add 2g of them at a mass concentration of 20%. oxalic acid, mixed uniformly to obtain a vanadium-tungsten solution, mixed the dry material with the vanadium-tungsten solution, added 28g of deionized water, stirred and mixed uniformly, and obtained a catalyst paste. Coat the paste on the stainless steel net, the thickness of the stainless steel net is 0.5mm, the length of the mesh is 2mm, the width of the mesh is 1mm, and the width of the mesh is 0.5mm. After rolling, it is dried at 150°C for 6 hours, and then put into the muffle Carry out calcination in a furnace, the calcination temperature is 550°C, the calcination time is 6h, and the plate catalyst can be obtained after natural cooling.

[0029] Take a certain amount of plate-type catalyst and place it...

Embodiment 2

[0031] Take 100g of titanium dioxide, 1.8g of glass fiber, and 2g of polyvinyl alcohol, mix them evenly to obtain a uniform dry material, take 5g of ammonium metavanadate, 10g of ammonium heptamolybdate, add 5g of ammonia water with a mass fraction of 20%, and mix well To obtain a vanadium-molybdenum solution, mix the dry material with the vanadium-tungsten solution, add 20 g of deionized water, stir and mix evenly, and obtain a catalyst paste. Coat the paste on the stainless steel net, the thickness of the stainless steel net is 1mm, the length of the mesh is 5mm, the width of the mesh is 2mm, and the width of the mesh bar is 0.6mm. After rolling it evenly, dry it at 150°C for 6 hours, and then put it into the muffle furnace. Calcination was carried out at a temperature of 550°C and a calcination time of 6 hours, and the plate catalyst was obtained after natural cooling.

[0032] Take a certain amount of plate-type catalyst and place it in a miniature activity evaluation devi...

Embodiment 3

[0034] Take 100g of titanium dioxide, 3g of copper acetate, 2g of glass fiber, and 2g of carboxymethyl cellulose, mix well to obtain a uniform dry material, take 4g of ammonium metavanadate, 15g of ammonium metatungstate, add 8g of 12% Ammonia, mixed evenly to obtain a vanadium-tungsten solution, mixed the dry material with the vanadium-tungsten solution, added 20 g of deionized water, stirred and mixed evenly, and obtained a catalyst paste. Coat the paste on the stainless steel net, the thickness of the stainless steel net is 1.5mm, the length of the mesh is 8mm, the width of the mesh is 6mm, and the width of the mesh bar is 0.8mm. After rolling it evenly, dry it at 120°C for 4 hours, and then put it into the muffle Carry out calcination in a furnace, the calcination temperature is 550°C, the calcination time is 5h, and the plate catalyst can be obtained after natural cooling.

[0035] Take a certain amount of plate-type catalyst and place it in a miniature activity evaluatio...

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Abstract

The invention relates to a plate-type catalyst capable of simultaneous denitration and demercuration and a preparation method thereof and belongs to the field of air pollution control. According to the catalyst, fiberglass, active components, a bonder, an assistant and a carrier are used as catalyst paste, and a framework is coated with the catalyst paste, wherein the active components are V2O5 and MoO3, or V2O5 and WO3, and the carrier is TiO2; in the catalyst paste, the mass ratio of carrier, to fiberglass, to catalyst active component V2O5, to catalyst active component MoO3 or WO3 to bonder to assistant is 100:(1-8):(0.1-5):(2-10):(0.5-5):(0-15). The catalyst simultaneously complete selective catalytic reduction of NOx and catalytic oxidation of Hg<0> in an SCR reactor, the generated Hg<2+> is washed and solidified in desulphurization gypsum in a follow-up desulphurization device through the smoke wet process, and the simultaneous removal of NOx and HgO is realized on the condition that no smoke purification device is added.

Description

technical field [0001] The invention relates to a plate catalyst for simultaneous denitrification and mercury removal and a preparation method thereof, belonging to the technical field of air pollution control. Background technique [0002] Because of its high toxicity, bioaccumulation and global transport, mercury has been highly valued by countries all over the world. my country is a big coal-consuming country. The amount of mercury emitted by coal-burning in my country has increased from 202t in 1995 to 257t in 2003, with an average annual growth rate of 3%. Among all coal-consuming industries, coal-fired power plants are the most important mercury pollution Sources of emission: In 2003, the amount of mercury emitted by coal-fired power plants accounted for 40% (100.1t) of the total amount of mercury emitted by coal combustion. The United States was the first country to legislate on mercury emissions. It began to control mercury emissions in 1990. During this period, it m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J23/28B01J23/888B01J23/887B01D53/86B01D53/64B01D53/56
Inventor 陈志平王虎吴浩江晓明李倩李红波王晓伟于爱华
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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