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Honeycomb type selective catalytic reduction denitration catalyst and preparation method thereof

A denitration catalyst and selective technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. The effect of improving wear performance, improving conversion rate, and increasing specific surface area

Active Publication Date: 2014-02-19
湖北景目环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the denitration efficiency of the denitration catalyst is high, the NO x The conversion rate reaches 65~95%, but there are problems that the mechanical strength of the catalyst needs to be strengthened and the specific surface area is low

Method used

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  • Honeycomb type selective catalytic reduction denitration catalyst and preparation method thereof

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preparation example Construction

[0035] In the preparation method of the honeycomb type selective catalytic reduction denitration catalyst of the present invention, it is divided into four steps: mixing, forming, drying and calcining in sequence. Specifically, (a) Mixing: first add deionized water to the co-catalyst precursor to form a solution, then add titanium dioxide, clay, static eliminator, mold release agent, and pH regulator in sequence, at 70~80°C Stir and control the water content to 25%~27%, then add the active component precursor, pore forming agent, and reinforcing agent in sequence, continue stirring for 10~30 minutes, and then add water-retaining binder to form a water content of 28.5~29.5%. Mud;

[0036] (b) Forming: put the mud obtained in step (a) stale for 10-20 hours at a room temperature above 20°C, filter and directly extrude into a honeycomb embryo body;

[0037] (c) Drying: dehydrating and drying the honeycomb embryo body obtained in step (b), to obtain a dry product with a transverse...

Embodiment 1

[0045] Honeycomb selective catalytic reduction denitrification catalyst, its raw material formula is as follows:

[0046] Titanium dioxide 78kg;

[0047] Clay 6kg;

[0048] Active component precursor 1.5kg;

[0049] Co-catalyst precursor 5kg;

[0050] Static Eliminator 0.5kg;

[0051] Release agent 0.3kg;

[0052] pH regulator 0.4kg;

[0053] Pore-forming agent 0.8kg;

[0054] Enhancer 5kg;

[0055] Water-retaining adhesive 2.5kg,

[0056] The preparation method of above-mentioned catalyst comprises the steps:

[0057] (a) Mixing: Add co-catalyst precursor and appropriate amount of deionized water into the mixer according to the above formula amount to make a solution, and then add the formula amount of titanium dioxide, clay, static eliminator, mold release agent, and pH regulator in sequence , Stir at 70-80°C and control the moisture content to 25%-27%, add the active component precursor, pore-forming agent, and reinforcing agent in sequence, continue stirring for 1...

Embodiment 2

[0062] Honeycomb selective catalytic reduction denitrification catalyst, its raw material formula is as follows:

[0063] Titanium dioxide 84.5kg;

[0064] Clay 4kg;

[0065] Active component precursor 0.5kg;

[0066] Co-catalyst precursor 4.5kg;

[0067] Static Eliminator 0.2kg;

[0068] Release agent 0.1kg;

[0069] pH adjuster 0.1kg;

[0070] Pore-forming agent 0.3kg;

[0071] Enhancer 4kg;

[0072] Water-retaining adhesive 1.8kg;

[0073] Catalyst scrap 11.1kg,

[0074] The preparation method of above-mentioned catalyst comprises the steps:

[0075] (a) Mixing: Add co-catalyst precursor and appropriate amount of deionized water into the mixer according to the above formula amount to make a solution, and then add the formula amount of titanium dioxide, clay, static eliminator, mold release agent, and pH regulator in sequence , and add the crushed catalyst scraps in the formula amount, stir at 70-80°C and control the moisture content to 25%-27%, add the active comp...

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Abstract

The invention relates to a honeycomb type selective catalytic reduction denitration catalyst and a preparation method thereof. According to the total mass of the catalyst, the catalyst comprises components of raw materials in percentage by mass as follows: 78%-84% of titanium dioxide, 4%-6% of clay, 0.5%-1.5% of an active component precursor, 4.5%-5% of a promoter precursor, 0.2%-0.5% of a static elimination agent, 0.1%-0.3% of a mold release, 0.1%-0.4% of an pH modifier, 0.3%-0.8% of a pore-forming agent, 4%-6% of a reinforcing agent and 1.8%-2.7% of a water retention binding agent, wherein the active component precursor is ammonium metavanadate, and the promoter precursor is ammonium metatungstate. A small quantity of the pore-forming agent, the reinforcing agent and the water retention binding agent is added, so that on one hand, the mechanical strength of the catalyst is improved, and the wear resistance of the catalyst is improved, and on the other hand, the specific surface area of the catalyst is increased, the activity of the catalyst can be improved and the contact area of the catalyst and NOx gas can be increased, and the conversion rate of the NOx is increased.

Description

technical field [0001] The invention relates to a catalyst, in particular to a honeycomb selective catalytic reduction denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main components of flue gas and the main pollutant of the atmospheric environment. It works with SO on the one hand x And other gases form destructive acid rain; on the other hand, it will form highly toxic photochemical smog, which will cause serious damage to animals and plants. With the increasingly serious flue gas pollution, the state has increased the intensity of mandatory denitrification. [0003] Flue gas denitrification methods can be divided into dry method and wet method. The dry method includes selective catalytic reduction (SCR, Selective Catalytic Reduction), selective non-catalytic reduction (SNCR), non-selective catalytic reduction (NSCR), molecular sieve , Activated carbon adsorption method and combined desulfur...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01D53/86B01D53/56
Inventor 索平巫福明华靖周枫林张福彬
Owner 湖北景目环保科技有限公司
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