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Honeycomb wall-flow ceramic catalyst for flue gas denitration and dust extraction, and preparation method thereof

A technology of denitrification and dust removal, honeycomb ceramics, applied in the direction of catalyst activation/preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of inability to control the soot content of the catalyst, inability to control the soot, and limited load capacity, etc., to achieve Improve the anti-alkali (earth) metal ability, simplify the flue gas treatment process, and prolong the service life

Inactive Publication Date: 2018-05-01
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalysts can only simply remove nitrogen oxides and cannot control smoke. At the same time, these catalysts mainly use TiO 2 As the main carrier, the cost is expensive
Patent CN1171663C uses cordierite honeycomb ceramics as the first carrier, activated alumina membrane as the second carrier, and CuO as the active component. Although this invention uses cordierite as the main carrier and has denitrification activity, it cannot control the soot content of the catalyst
Patent CN104190399B discloses a porous inorganic alumina ceramic membrane as a carrier, V 2 o 5 and TiO 2 Loaded on the surface of the carrier to obtain an integrated material for denitrification and dust removal. This patent loads the active ingredient through the coating process. Its loading capacity is limited and it is easy to fall off after loading

Method used

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  • Honeycomb wall-flow ceramic catalyst for flue gas denitration and dust extraction, and preparation method thereof
  • Honeycomb wall-flow ceramic catalyst for flue gas denitration and dust extraction, and preparation method thereof
  • Honeycomb wall-flow ceramic catalyst for flue gas denitration and dust extraction, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of wall-flow honeycomb ceramic catalyst for flue gas denitrification and dust removal

[0032] (1) Preparation of titanium-based nanotubes: Add titanium dioxide P25 into a sodium hydroxide solution with a concentration of 2mol / L at a mass-volume ratio of 1:20, stir vigorously for 2.5 hours, then hydrothermally react at 130°C for 1 day, and then remove the lower layer The precipitate is washed with 0.1 mol / L hydrochloric acid until the pH is 1, then the lower precipitate washed with hydrochloric acid is sucked and dried at 80°C, and finally the dried lower precipitate is ground to 40-100 mesh to prepare To obtain titanium-based nanotubes, the unit of the mass-to-volume ratio is g:mL;

[0033] (2) Preparation of vanadium-tungsten-titanium nanotubes: mix the ammonium metavanadate and ammonium metatungstate aqueous solutions evenly, then add the titanium-based nanotubes prepared in step (1), stir for 8 hours and spray dry at 80°C , and then calcined at 500°C fo...

Embodiment 2

[0042] Preparation of wall-flow honeycomb ceramic catalyst for flue gas denitrification and dust removal

[0043] (1) Preparation of titanium-based nanotubes: Add titanium dioxide P25 into a sodium hydroxide solution with a concentration of 1 mol / L according to the mass volume ratio of 1:12.5, stir vigorously for 2.5 hours, then hydrothermally react at 135°C for 1 day, and then remove the lower layer The precipitate was washed with hydrochloric acid until the pH should be 0, then the lower precipitate washed with hydrochloric acid was sucked and dried at 80°C, and finally the dried lower precipitate was ground to 40-100 mesh to obtain titanium-based nanometer Tube, the unit of the mass volume ratio is g:mL;

[0044] (2) Preparation of vanadium-tungsten-titanium nanotubes: mix the ammonium metavanadate and ammonium metatungstate aqueous solutions evenly, then add the titanium-based nanotubes prepared in step (1), stir for 8 hours and spray dry at 80°C , and then calcined at 45...

Embodiment 3

[0053] Preparation of wall-flow honeycomb ceramic catalyst for flue gas denitrification and dust removal

[0054] (1) Preparation of titanium-based nanotubes: Add titanium dioxide P25 into a sodium hydroxide solution with a concentration of 2 mol / L at a mass-volume ratio of 1:15, stir vigorously for 2.5 hours, then react hydrothermally at 140°C for 1 day, and then remove the lower layer The precipitate was washed with hydrochloric acid until the pH was 1, and then the lower precipitate washed with hydrochloric acid was suction-filtered and dried at 80°C, and finally the dried lower precipitate was ground to 40-100 mesh to obtain titanium-based nanometer Tube, the unit of the mass volume ratio is g:mL;

[0055] (2) Preparation of vanadium-tungsten-titanium nanotubes: mix the ammonium metavanadate and ammonium metatungstate aqueous solutions evenly, then add the titanium-based nanotubes prepared in step (1), stir for 8 hours and spray dry at 80°C , and then calcined at 600°C fo...

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Abstract

The invention relates to a honeycomb wall-flow ceramic catalyst for flue gas denitration and dust extraction, and a preparation method thereof, which belong to the technical field of catalysts. The method comprises five processes of preparing and mixing, extruding, drying, blocking and calcining. Through a blocking technology, a state of each through hole in a traditional honeycomb SCR (SelectiveCatalytic Reduction) catalyst is changed, so that flue gas enters from one end of the honeycomb catalyst and passes through a side wall of an adjacent hole of an unsealed hole in an inlet end, smoke dust is filtered and removed through the side wall, the retention time of the flue gas is prolonged, and the catalyst efficiency is improved. Meanwhile, according to the catalyst, by adding a vanadium-tungsten-titanium nanotube, not only is the mechanical strength of a honeycomb ceramic improved, but also the adhesive strength of a vanadium-tungsten active substance is improved; by a special structure of the nanotube, a specific surface area of the catalyst is improved, and the denitration activity of the catalyst is promoted. Meanwhile, poisonous metals are isolated through a tube wall of thevanadium-tungsten-titanium nanotube, so that the alkali (soil) metal resistance of the catalyst is improved, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a flue gas denitrification and dust removal wall-flow honeycomb ceramic catalyst and a preparation method thereof. Background technique [0002] At present, the air pollution situation in our country is very serious. While the traditional soot-type pollution has not been controlled, the regional composite air pollution characterized by ozone, fine particulate matter (PM2.5) and acid rain is becoming more and more prominent, seriously restricting the social economy. sustainable development, threatening the health of the public. Nitrogen oxides (NO x ) is one of the important causes of air pollution such as ozone, fine particulate matter, and acid rain. How to effectively control nitrogen oxides and soot emissions has become one of the important issues in the field of air pollution control in my country. In September 2014, the National Development and Reform Commiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/04B01J35/10B01J37/00B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/30B01J37/00B01D2258/0283B01J2523/00B01J35/61B01J35/56B01J2523/55B01J2523/69B01J2523/47B01J2523/31B01J2523/11B01J2523/41
Inventor 刘显彬周林段明华王雪冲杨欢邓雷段言康
Owner CHONGQING YUANDA CATALYST MFG
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