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

A technology of honeycomb metal and wire mesh, which is applied in the field of catalyst preparation for fixed source tail gas denitrification, can solve the problems of easy dust clogging, sulfur poisoning, poor denitrification activity, etc., and achieve good low temperature denitrification activity, good low temperature sulfur resistance Effect

Active Publication Date: 2011-08-31
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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1. Preparation of a supported honeycomb metal wire mesh catalyst for denitration of stationary source exhaust gas. 2 O 5 , WO 3 And TiO 2 The load is more appropriate.

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

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

[0025] The flat and corrugated stainless steel wire mesh with aluminum oxide coating is alternately stacked, bundled and wrapped to form a rectangular parallelepiped honeycomb wire mesh carrier with a t...

Example Embodiment

[0032] Example 2, Preparation of a supported honeycomb metal wire mesh catalyst for denitration of stationary source exhaust gas, and its V 2 O 5 And WO 3 -TiO 2 The load is relatively small.

[0033] In 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 prepare 50ml aqueous solution, and slowly add 20g WO 3 And anatase TiO 2 Mixed powder, of which WO 3 The weight is 10% of the weight of the mixed powder. Stir for 4 hours to obtain WO 3 -TiO 2 A slurry with a content of 400g / L; the catalyst support obtained in step 1 is immersed in the slurry for 10 minutes, taken out and dried at 100°C for 4 hours, then calcined at a high temperature of 300°C for 3 hours, and then reduced to room temperature to obtain a supported WO 3 -TiO 2 The honeycomb metal wire mesh carrier;

[0036] The third step, V 2 O 5 Load

[0037] The catalyst carrier obtained in s...

Example Embodiment

[0041] Example 3 Preparation of a supported honeycomb metal wire mesh catalyst for denitration of stationary source exhaust gas. 2 O 5 And WO 3 -TiO 2 The load is relatively large.

[0042] In 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 prepare a 50ml aqueous solution, and slowly add 10g WO 3 And anatase TiO 2 Mixed powder, of which WO 3 The weight is 15% of the weight of the mixed powder. Stir for 6 hours to obtain WO 3 -TiO 2 A slurry with a content of 200g / L; the catalyst carrier obtained in step 1 is immersed in the slurry for 5 minutes, taken out and dried at a temperature of 120°C for 2 hours, the immersion-drying step is repeated twice, and then calcined at a high temperature of 600°C for 2 hours, Then down to room temperature, get load WO 3 -TiO 2 The honeycomb metal wire mesh carrier;

[0045] The third step, V 2 O 5 Load

[00...

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PUM

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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 of the 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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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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