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Flue gas synergistic denitration and demercuration catalyst preparation method and catalyst

A catalyst and denitrification technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as flue gas conditions and formulation limitations, achieve synergistic mercury oxidation and removal performance, improve NOx removal efficiency, Efficient removal effect

Pending Publication Date: 2021-11-05
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] SCR catalyst for elemental mercury (Hg 0 ) has a certain oxidation effect, and can convert elemental mercury (Hg 0 ) Part of the catalyst is oxidized to mercury oxide (Hg 2+ ), so that the dedusting device and wet desulfurization device can remove mercury. However, the oxidation rate of mercury to SCR denitrification catalysts (conventional coal-fired power plant denitrification SCR catalysts are vanadium-titanium series) is limited by flue gas conditions and formulations. Mercury Oxidation efficiency

Method used

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  • Flue gas synergistic denitration and demercuration catalyst preparation method and catalyst
  • Flue gas synergistic denitration and demercuration catalyst preparation method and catalyst
  • Flue gas synergistic denitration and demercuration catalyst preparation method and catalyst

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preparation example Construction

[0033] A method for preparing a flue gas synergistic denitrification and demercuration catalyst, comprising the following steps:

[0034] S1. Prepare raw materials, which include titanium dioxide carrier, active components and auxiliary agents.

[0035] The active component includes a vanadium-containing compound, a tungsten-containing compound, a metal compound or metal particles, and the mass ratio of the titanium dioxide carrier, the vanadium-containing compound, and the tungsten-containing compound is 70:4:1. The molar ratio of the metal element in the metal compound or metal particle to the vanadium element in the vanadium-containing compound is in the range of 0.8:1-1.5:1. in:

[0036] The tungsten-containing compound is selected from one or more of ammonium metatungstate, ammonium paratungstate, ammonium tungstate, tungstic acid, and tungsten trioxide, and ammonium paratungstate is preferred.

[0037] The vanadium-containing compound is selected from one or more of am...

Embodiment 1

[0044] S1. Prepare titanium dioxide powder, ammonium paratungstate, ammonium metavanadate, cerium nitrate, binder, stearic acid, kapok, and pore-forming agent, wherein the mass ratio of titanium dioxide, ammonium paratungstate, and ammonium metavanadate is 70:40:1, The molar ratio of vanadium to cerium in cerium nitrate is 1:1;

[0045] S2. Put the raw materials, ammonium chloride, and ammonia water in a mixing reactor and stir evenly and completely to form a mixture. The temperature of the mixture reaches 80° C., and the mixing time is 10 hours;

[0046] S3. Extrude the mixture in step S2, then dry at 90° C. for 24 hours, and finally calcine at 600° C. for 20 hours to obtain a catalyst.

Embodiment 2

[0048] S1. Prepare titanium dioxide powder, ammonium paratungstate, ammonium metavanadate, cobalt nitrate, binder, stearic acid, kapok, and pore-forming agent, wherein the mass ratio of titanium dioxide, ammonium paratungstate, and ammonium metavanadate is 70:40:1, The molar ratio of vanadium element to cobalt element in cobalt nitrate is 1:0.8;

[0049] S2. Put the raw materials, ammonium chloride, and ammonia water in a mixing reactor and stir evenly and completely to form a mixture. The temperature of the mixture reaches 70° C., and the mixing time is 10 hours;

[0050]S3. Extrude the mixture in step S2, dry at 120° C. for 20 hours, and finally calcine at 560° C. for 36 hours to obtain a catalyst.

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Abstract

The invention relates to a flue gas synergistic denitration and demercuration catalyst preparation method and a catalyst. The preparation method comprises the following steps: S1, preparing raw materials, wherein the raw materials comprise a titanium dioxide carrier and active components, and the active components comprise a vanadium-containing compound, a tungsten-containing compound, a metal compound or metal particles, metal elements in the metal compound or the metal particles are one or more of cerium, cobalt, manganese, niobium and zirconium; S2, dissolving the raw materials in the step S1 in a solvent, and mixing to obtain a mixture; and S3, performing extrusion molding on the mixture in the step S2, and performing drying and roasting to obtain the catalyst. The titanium dioxide carrier and the active component are mixed, and meanwhile, one or more metal compounds or metal particles are added, so that the denitration performance of the catalyst is improved, and meanwhile, the catalyst has relatively high synergistic mercury oxidation removal performance; and the catalyst disclosed by the invention belongs to a synergistic denitration and demercuration catalyst for controlling waste gas pollutants, and nitrogen oxides and elemental mercury contained in flue gas are efficiently removed.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a method for preparing a flue gas synergistic denitrification and demercuration catalyst and the catalyst. Background technique [0002] In the process of coal-fired power generation, the exhausted flue gas contains a large amount of heavy metal pollutants such as particulate dust, sulfur dioxide, nitrogen oxides, and mercury. With the advancement of ultra-low emissions of pollutants in the power industry, dust removal, desulfurization, and denitrification can be realized by upgrading existing control equipment, and the coordinated emission reduction control of heavy metal mercury has become the focus of current research. [0003] In the denitrification of domestic coal-fired power plant systems, SCR denitrification has been widely used as the mainstream technology for controlling NOx emissions in large coal-fired power plants. Through efficiency improvement measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/888B01J23/34B01D53/64B01D53/60B01D53/86
CPCB01J23/30B01J23/888B01J23/34B01D53/8637B01D53/8665Y02A50/20
Inventor 王凯雷嗣远鲍强马云龙姚燕张庆文卿梦磊王乐乐杨晓宁
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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