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Non-uniform honeycomb type denitration catalyst and preparation method thereof

A denitration catalyst, honeycomb-type technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. The effect of reducing SO2 oxidation rate, low cost, and reducing SO3 production

Active Publication Date: 2016-11-23
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commercial SCR catalysts currently used are all homogeneous honeycomb catalysts, which are limited by SO 2 converted to SO 3 The production of sulfate covers the surface of the catalyst, which leads to the decline of denitrification performance and the limitation of subsequent equipment corrosion. The vanadium content of the catalyst generally does not exceed 1.5%, so the existing catalysts have limited activity improvement, and generally ultra-low emissions can only be achieved by loading more catalysts. , which greatly increases the denitrification operating cost of the power plant

Method used

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  • Non-uniform honeycomb type denitration catalyst and preparation method thereof
  • Non-uniform honeycomb type denitration catalyst and preparation method thereof
  • Non-uniform honeycomb type denitration catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Preparation carrier:

[0042] 1) mixing: in parts by mass, take TiO 2 100 parts of powder, 40 parts of deionized water, 5 parts of organic binder, 4 parts of plasticizer, 2 parts of extrusion aid, 20 parts of ammonia water, and 6 parts of glass fiber are fully mixed and stirred to obtain a plastic colloid;

[0043] 2) Extrusion: Extrude the plastic colloid through a thin-walled mold to obtain a shaped honeycomb body;

[0044] 3) Drying: drying the honeycomb body at 70°C for 144 hours;

[0045] 4) Calcination: calcining the dried honeycomb green body at a temperature of 600°C for 5 hours to obtain a carrier.

[0046] To prepare the active solution:

[0047] According to the catalyst containing 1% active component V 2 o 5 , 1.2% WO 3 Prepare vanadium oxalate solution and ammonium metatungstate solution, mix and stir the two solutions evenly, based on the mass ratio of citric acid to active solution, then add 0.5% citric acid and stir evenly for later use.

[0048] ...

Embodiment 2

[0052] The immersion time is 30min, according to the catalyst containing 1% V of active components in the synthesis 2 o 5 , 1.8% WO 3 Benchmark preparation vanadium oxalate solution and ammonium metatungstate solution, other processes and conditions such as example 1, make catalyst 2, wherein WO 3 content of 1.8%, V 2 o 5 The content is 1%.

Embodiment 3

[0054] No competitive adsorbent is added, the impregnation time is 10min, according to the catalyst containing 1% of active components V 2 o 5 , 1.5% WO 3 Benchmark preparation vanadium oxalate solution and ammonium metatungstate solution, other processes and conditions such as example 1, make catalyst 3, wherein WO 3 content of 1.5%, V 2 o 5 The content is 1%.

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Abstract

The invention discloses a non-uniform honeycomb type denitration catalyst and a preparation method thereof. The catalyst comprises a support and an active component V2O5, WO3 or MoO3 supported on the support, wherein the support is prepared from TiO2 powder, deionized water, an organic binder, a plasticizer, an extrusion aid, ammonia water, glass fibers and the like through mixing, extruding, drying and calcining. The invention further discloses the preparation method of the catalyst. According to the prepared catalyst, the active component is distributed non-uniformly on the support and is mainly distributed on the outer surface of the catalyst, more active sites are provided, so that the reducing capacity of NOx is improved, the SO2 oxidation rate is reduced, the use amount of W or Mo is reduced through surface distribution of a W component or a Mo component, the cost is reduced remarkably, and promotion and application of denitration engineering are facilitated.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a heterogeneous honeycomb type denitration catalyst and a preparation method thereof. Background technique [0002] With the implementation of the "Emission Standard of Air Pollutants for Thermal Power Plants GB13223-2011", coal-fired denitrification of thermal power plants has become the top priority of environmental protection for thermal power plants during the 12th Five-Year Plan period. During the 13th Five-Year Plan period, according to the resolution of the State Council meeting, it was proposed to complete the comprehensive implementation of ultra-low emission and energy-saving transformation of coal-fired units before 2020. Specifically, the concentration of nitrogen oxide emissions should not exceed 50 mg / m3. Denitrification catalysts present challenges and opportunities. [0003] The commercial SCR catalysts currently used are all homogeneous honeycomb c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/28
CPCB01J23/28B01J23/30B01J37/0203B01J35/396
Inventor 刘红辉黄锐段明华樊永生席文昌周林刘伟袁鹏张政科邓巧莲
Owner CHONGQING YUANDA CATALYST MFG
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