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Preparation of coating formula v by slurry dipping method 2 o 5 -wo 3 ‑tio 2 ‑sio 2 catalyst approach

A catalyst and slurry technology, which is applied in the field of nitrogen oxide reduction catalyst preparation, can solve the problems of less use, high energy consumption, complex process, etc., and achieve the effect of reducing energy consumption and reducing the number of load cycles

Active Publication Date: 2017-11-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is complex and energy-intensive, and less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of coating formula V prepared by slurry dipping method 2 o 5 -WO 3 -TiO 2 -SiO 2 Catalyst method, with cordierite honeycomb ceramics as the substrate, with V 2 o 5 Main catalyst, WO 3 as cocatalyst, TiO 2 and SiO 2 As a direct carrier, it is prepared by the process of slurry impregnation, drying and calcination. The steps are as follows:

[0026] 1) cordierite matrix pretreatment

[0027] The cordierite matrix is ​​honeycomb ceramics, its shape is cylindrical, and the number of pores is 100 meshes. It belongs to cordierite with smooth matrix surface and small specific surface area. In nitric acid with a percentage concentration of 26%, the treatment time is 4 hours, and the specific surface area after acid etching is 80m 2 / g, after acid etching, wash with distilled water until the pH of the washing liquid is neutral, blow off the residual liquid with an air compressor, then dry the substrate at 120°C for 3 hours, and calcinate at 550°C for 4 hours to r...

Embodiment 2

[0034] A kind of coating formula V prepared by slurry dipping method 2 o 5 -WO 3 -TiO 2 -SiO 2 Catalyst method, with cordierite honeycomb ceramics as the substrate, with V 2 o 5 Main catalyst, WO 3 as cocatalyst, TiO 2 and SiO 2 As a direct carrier, it is prepared by the process of slurry impregnation, drying and calcination. The steps are as follows:

[0035] 1) cordierite matrix pretreatment

[0036] The base of cordierite is honeycomb ceramics, its shape is cube, and the number of pores is 300 meshes. It belongs to cordierite with smooth substrate surface and small specific surface area. In hydrochloric acid with a concentration of 15%, the treatment time is 3 hours, and the specific surface area after acid etching is 55m 2 / g, after acid etching, wash with distilled water until the pH of the washing liquid is neutral, blow off the residual liquid with an air compressor, then dry the substrate at 120°C for 3 hours, and calcinate at 550°C for 4 hours to remove the ...

Embodiment 3

[0043] A kind of coating formula V prepared by slurry dipping method 2 o 5 -WO 3 -TiO 2 -SiO 2 Catalyst method, with cordierite honeycomb ceramics as the substrate, with V 2 o 5 Main catalyst, WO 3 as cocatalyst, TiO 2 and SiO 2 As a direct carrier, it is prepared by the process of slurry impregnation, drying, and calcination. The steps are as follows:

[0044] 1) cordierite matrix pretreatment

[0045] The cordierite matrix is ​​honeycomb ceramics, its shape is elliptical, and the number of pores is 600 meshes. It belongs to cordierite with smooth matrix surface and small specific surface area. In oxalic acid with a percentage concentration of 40%, the treatment time is 3 hours, and the specific surface area after acid etching is 72m 2 / g, after acid etching, wash with distilled water until the pH of the washing liquid is neutral, blow off the residual liquid with an air compressor, then dry the substrate at 120°C for 3 hours, and calcinate at 550°C for 4 hours to r...

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Abstract

The invention discloses a method for preparing a coating type V2O5-WO3-TiO2-SiO2 catalyst by a grout dipping method. The catalyst is prepared by taking cordierite honeycomb ceramics as a matrix, V2O5 as a main catalyst, WO3 as a cocatalyst, and TiO2 and SiO2 as a direct carrier, and adopting grout dipping, drying and calcining, and can be used for the selective catalytic reduction of diesel tail gas nitric oxide containing relatively high sulphur content at a high airspeed. The preparation method has the advantages that the process is simple, dipping grouting is formed by directly mixing active substances and the direct carrier, so that the loading times and the energy consumption in the production process can be greatly reduced; through acid treatment of the cordierite matrix, the specific surface area of the matrix is greatly increased, so that the dispersibility and the activity of a catalyst active substance on the surface of the matrix and the combined strength of a coating and the matrix are improved; and the prepared catalyst has relatively high catalytic activity, strong mechanical stability, sulphur resistance and hydrothermal stability.

Description

technical field [0001] The present invention relates to a kind of load V on cordierite 2 o 5 -WO 3 -TiO 2 -SiO 2 The method of coating type SCR catalyst can be used for the selective catalytic reduction of nitrogen oxides in exhaust gas of diesel engines with high space velocity and high sulfur content, and belongs to the field of preparation of nitrogen oxide reduction catalysts. Background technique [0002] Nitrogen oxides are one of the main pollutants that cause many environmental problems such as acid rain, acid fog, photochemical smog, greenhouse effect, and ozone layer depletion. They have received great attention in the past 30 years, and correspondingly produced many control technologies. Diesel engine exhaust also contains a large amount of nitrogen oxides, which contribute up to 10% of man-made nitrogen oxide emissions according to research, and the control standards for diesel engine nitrogen oxide emissions have become increasingly stringent in recent years...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/94B01D53/56
Inventor 沈伯雄李富宽张浩浩
Owner HEBEI UNIV OF TECH