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Vanadium-free denitration catalyst for arsenic-containing flue gas and preparation process thereof

A denitration catalyst and technology for preparation process, applied in the field of vanadium-free denitration catalyst and preparation thereof, can solve the problems of reduced denitration efficiency, reduced amount of adsorbed arsenic, blocked microscopic pores, etc., so as to achieve inhibition of deposition and accumulation, development of pores, and slowing of deactivation. Effect

Inactive Publication Date: 2019-02-22
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a vanadium-free denitrification catalyst for arsenic-containing flue gas and its preparation process. The catalyst of the present invention still has high denitrification efficiency and deactivation resistance when the arsenic content is as high as 2.5 wt%, which can overcome the existing In the arsenic-containing flue gas, the catalyst with vanadium pentoxide as the active substance will block the microscopic pores due to the reaction of vanadium pentoxide and arsenic, reduce the amount of adsorbed arsenic, reduce the denitrification efficiency quickly, have poor activity and short life.

Method used

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  • Vanadium-free denitration catalyst for arsenic-containing flue gas and preparation process thereof
  • Vanadium-free denitration catalyst for arsenic-containing flue gas and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) 35 parts by mass of 5% Ce-ZSM-5 zeolite molecular sieve, containing 5% SO 4 2- 65 parts by mass of titanium dioxide and 10 parts by mass of zirconium-molybdenum composite oxide prepared by high-energy ball milling (where the content of zirconia is 0 parts by mass and the content of molybdenum oxide is 10 parts by mass), 2 parts by mass of hydroxypropyl methylcellulose, Put 1 mass part of basalt fiber, 0.25 mass part of cetyltrimethylammonium bromide, and 0.25 mass part of sucrose into a mixer and stir for 30 minutes, then add 2 mass parts of silica sol and 249 mass parts of deionized water and knead for 60 minutes to obtain plastic clay material, and then put the mud into the mud training machine and practice the mud repeatedly for 3 times;

[0024] 2) Put the mud obtained in step 1) stale for 12 hours, then pass through a 60-mesh filter in a pre-extruder with a vacuum degree of 0.09MPa, and extrude into strips of mud;

[0025] 3) Extrude the sludge obtained in ste...

Embodiment 2

[0029] 1) 45 parts by mass of 15%-β molecular sieve containing 8% SO 4 2- 55 parts by mass of titanium dioxide and 20 parts by mass of zirconium-molybdenum composite oxide prepared by high-energy ball milling (including 5 parts by mass of zirconia and 15 parts by mass of molybdenum oxide), 4 parts by mass of hydroxypropyl methylcellulose, Put 3 parts by mass of basalt fiber, 1.2 parts by mass of cetyltrimethylammonium bromide, and 0.3 parts by mass of sucrose into a mixer and stir for 30 minutes, then add 5 parts by mass of silica sol and 300 parts by mass of deionized water and knead for 60 to 90 minutes to obtain Plastic mud, and then put the mud into the mud refining machine and practice the mud repeatedly 5 times;

[0030] 2) Put the sludge obtained in step 1) stale for 24 hours, then pass through an 80-mesh filter in a pre-extruder with a vacuum degree of 0.098 MPa, and extrude it into strips of sludge;

[0031]3) Extrude the sludge obtained in step 2) through a die und...

Embodiment 3

[0035] 1) 40 parts by mass of 10% Ce-Y molecular sieve containing 6% SO 4 2- 60 parts by mass of titanium dioxide and 15 parts by mass of zirconium-molybdenum composite oxide prepared by high-energy ball milling (including 5 parts by mass of zirconia and 10 parts by mass of molybdenum oxide), 3 parts by mass of hydroxypropyl methylcellulose, Put 2 parts by mass of basalt fiber, 0.75 parts by mass of cetyltrimethylammonium bromide, and 0.75 parts by mass of sucrose into a mixer and stir for 45 minutes, then add 0.5 parts by mass of pine tar, 4 parts by mass of silica sol, and 270 parts by mass of deionized water Knead for 80 minutes to obtain plastic mud, then put the mud into the mud trainer and practice the mud repeatedly 4 times;

[0036] 2) Put the sludge obtained in step 1) stale for 18 hours, then pass through a 70-mesh filter in a pre-extruder with a vacuum of 0.095 MPa, and extrude it into a strip of sludge;

[0037] 3) Extrude the sludge obtained in step 2) through a...

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Abstract

The invention provides a vanadium-free denitration catalyst for arsenic-containing flue gas and a preparation process thereof. The catalyst still has a high denitration efficiency and anti-deactivating property when the arsenic content reaches up to 2.5 wt%. The catalyst can solve the problem that the arsenic adsorption amount is reduced, the denitration efficiency is reduced, the activity is relatively poor and the service life is short as vanadium pentaoxide is reacted with arsenic to block microcosmic ducts in the arsenic-containing flue gas which takes vanadium pentaoxide as the active substance.

Description

technical field [0001] The invention relates to a vanadium-free denitrification catalyst for arsenic-containing flue gas and a preparation process thereof. Background technique [0002] Nitrogen oxides are an important part of air pollution. Nitrogen oxides emitted by the thermal power industry account for about 30% of the total emissions. Selective catalytic reduction technology has been widely used in coal-fired power stations with its mature technology and high denitrification efficiency. Applications, where the denitrification catalyst is a key part of the denitrification system. The widely used denitration catalyst is the commercial V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 base catalyst. When the denitrification catalyst is in use, the temperature environment is 300-420 ° C, most of the layout is high in dust, and the catalyst is in a long-term environment containing fly ash, SO 2 , alkali metals, Hg, As and other flue gases can easily cause catalyst poisoning and deactivati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/16B01J29/48B01J29/78B01J29/84B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J29/166B01J29/48B01J29/7815B01J29/783B01J29/84B01J2229/18
Inventor 张涛刘安阳罗民华孙宏伟任英杰
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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