Honeycomb wire mesh catalyst for stationary source tail gas denitration and preparation thereof

A honeycomb metal and wire mesh technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy dust blockage, easy sulfur poisoning, poor denitration activity, etc. Good low temperature denitration activity, good low temperature sulfur resistance effect

Active Publication Date: 2012-11-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of existing stationary source tail gas denitrification catalysts such as poor denitrification activity at lower temperatures, easy sulfur poisoning, and easy to be blocked by dust under the flue gas conditions of power plants. Honeycomb metal mesh carrier, to prepare a honeycomb catalyst with low resistance to gas, excellent denitrification activity, sulfur resistance, water resistance and dust resistance in a lower temperature range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, preparation is used for the supported type honeycomb metal gauze catalyst of stationary source tail gas denitrification, its V 2 o 5 、WO 3 and TiO 2 loads are relatively appropriate.

[0023] The first step, the preparation of the catalyst support

[0024]Electrodeposition was carried out with stainless steel wire mesh as the cathode, and the electrodeposition solution was mixed and ultrasonically oscillated for 40 minutes, containing 0.304mg / L polyacrylic acid, 0.4g / L aluminum isopropoxide, 40.0g / L γ-Al 2 o 3 Powder, 4.0g / L aluminum powder in absolute ethanol, the electrodeposition voltage is 20V; after the electrodeposition is completed, the wire mesh is taken out and dried, and kept at a high temperature of 800°C for 2h, and the thickness of the prepared alumina coating is 50μm.

[0025] The aluminum oxide-coated flat and corrugated stainless steel wire meshes are alternately piled up, bundled and wrapped to make a rectangular parallelepiped honeyc...

Embodiment 2

[0032] Embodiment 2, preparation is used for the supported type honeycomb metal gauze catalyst of stationary source tail gas denitrification, its V 2 o 5 and WO 3 -TiO 2 loads are relatively small.

[0033] The first step, the preparation of the catalyst carrier, is the same as in Example 1.

[0034] The second step, WO 3 -TiO 2 load

[0035] Mix polyvinyl alcohol and water at a mass ratio of 1:20 to form a 50ml aqueous solution, slowly add 20g WO 3 and anatase TiO 2 mixed powder, where WO 3 The weight is 10% of the weight of the mixed powder, stirred for 4h to obtain WO 3 -TiO 2 A slurry with a content of 400g / L; immerse the catalyst carrier obtained in step 1 in the above slurry for 10 minutes, take it out and dry it at 100°C for 4h, then roast it at 300°C for 3h, and then lower it to room temperature to obtain the loaded WO 3 -TiO 2 Honeycomb wire mesh carrier;

[0036] In the third step, V 2 o 5 load

[0037] Immerse the catalyst carrier obtained in step 2 ...

Embodiment 3

[0041] Embodiment 3, preparation is used for the support type honeycomb metal gauze catalyst of stationary source tail gas denitrification, its V 2 o 5 and WO 3 -TiO 2 loads are relatively high.

[0042] The first step, the preparation of the catalyst carrier, is the same as in Example 1.

[0043] The second step, WO 3 -TiO 2 load

[0044] Mix polyvinyl alcohol and water at a mass ratio of 1:10 to form a 50ml aqueous solution, slowly add 10g WO 3 and anatase TiO 2 mixed powder, where WO 3 The weight is 15% of the mixed powder weight, stirred for 6h to obtain WO 3 -TiO 2 A slurry with a content of 200g / L; immerse the catalyst carrier obtained in step 1 in the above slurry for 5 minutes, take it out and dry it at a temperature of 120°C for 2h, repeat the dipping-drying step twice, and then bake it at a high temperature of 600°C for 2h, After cooling down to room temperature, the loaded WO 3 -TiO 2 Honeycomb wire mesh carrier;

[0045] In the third step, V 2 o 5 l...

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Abstract

The invention belongs to the field of the preparation of catalysts for stationary source tail gas denitration, and relates to the preparation of a catalyst by using a honeycomb metal carrier. Tabular and corrugated wire meshes attached with aluminum oxide coatings are stacked alternately and fixedly molded to form a catalyst carrier; a passage inside the carrier has a three-dimensional transparent structure. The preparation is characterized in that: the catalyst is prepared by loading the active components V2O5, WO3 and TiO2 on the surface of the catalyst carrier by a stepwise loading method;the mass sum of the V2O5, the WO3 and the TiO2 is 10-70 percent of the total weight of the aluminum oxide coatings and the V2O5, the WO3 and the TiO2; and the mass of V elements is 0.2-5.6 percent ofthe mass sum of the V2O5, the WO3 and the TiO2. The catalyst of the invention has low-temperature denitration activity and low-temperature sulfur and water resistant performance; and when the smoke temperature is 250 DEG C, the SO2 concentration is 600 ppm and the moisture content is 10%, the denitration efficiency of the catalyst is above 90%.

Description

technical field [0001] The invention belongs to the field of catalyst preparation for fixed source tail gas denitrification, and relates to the preparation of a catalyst using a honeycomb carrier. Background technique [0002] The installed capacity, power generation and coal consumption of my country's thermal power industry are all on the rise, and the resulting nitrogen oxides (NO x ) have increasingly serious impacts on the environment. [0003] At present, the denitrification technology of stationary source tail gas mainly adopts selective catalytic reduction of ammonia (NH 3 -SCR), the core of which is the study of catalysts. According to the different catalyst carriers, the catalysts currently on the market for stationary source tail gas denitrification are mainly divided into honeycomb type, flat plate type and corrugated plate type. Among them, the honeycomb type catalyst has low pressure drop, wear resistance and excellent denitrification activity. It has been u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J35/04B01D53/90B01D53/56
Inventor 全燮束韫孙红陈硕赵慧敏张耀斌
Owner DALIAN UNIV OF TECH
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