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Preparation method of low-cost honeycomb denitration catalyst

A denitration catalyst and a honeycomb-type technology, applied in the field of catalysis, can solve the problems of low utilization rate of diatomite and high catalyst cost, achieve the effects of good denitration activity and anti-wear ability, low cost, and reduced manufacturing cost

Active Publication Date: 2015-01-21
JIANGSU LONGYUAN CATALYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method of using diatomite instead of a large amount of titanium dioxide to prepare a honeycomb denitration catalyst, which is used to solve the problems of high cost of existing catalysts and low utilization rate of diatomite in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Acidification treatment with diatomite: soak diatomite in an acid solution with a pH of 6, stir for 14 hours, age overnight, dry at 100°C, and grind to a particle size of d 90 ≤30μm;

[0023] (2) Mixing of slurry: Take 50 parts of acidified diatomite, 10 parts of titanium dioxide, 1 part of active component vanadium oxide and 1 part of sodium hydroxymethylcellulose as a molding aid, add them to the kneader, and then add Stir 300 parts of deionized water for 1 hour at a speed of 200 r / min, mix evenly, and obtain a slurry for use;

[0024] (3) Extrusion molding: take the slurry prepared in step (2) and knead twice in a vacuum mud mill, the kneading temperature is 20°C, and the vacuum degree is 0.085MPa; the kneaded mixture is put into a hydraulic extrusion In the machine, the honeycomb denitration catalyst body is obtained by extrusion, and the extrusion pressure is 5Mpa;

[0025] (4) Drying and calcination: Take the honeycomb denitration catalyst body obtained in ...

Embodiment 2

[0027] (1) Acidification treatment with diatomite: soak diatomite in an acid solution with a pH of 4 and stir for 10 hours, age overnight, dry at 100°C, and grind to a particle size of d 90 ≤30μm;

[0028] (2) Mixing of slurry: take 70 parts of acidified diatomite, 30 parts of titanium dioxide, 5 parts of active component tungsten oxide, 5 parts of copper oxide, 3 parts of polyacrylamide and 7 parts of glass fiber, add To the kneader, add 300 parts of deionized water and stir for 1 hour at a speed of 1000r / min, mix evenly, and obtain a slurry for use;

[0029] (3) Extrusion molding: Take the slurry prepared in step (2) and mix it in a vacuum mud mill for 4 times, the mixing temperature is 100°C, and the vacuum degree is 0.085MPa; the mixed mixture is put into a hydraulic extrusion In the machine, the honeycomb denitration catalyst body is obtained by extrusion, and the extrusion pressure is 2Mpa;

[0030] (4) Drying and calcination: Take the honeycomb denitrification cataly...

Embodiment 3

[0032] (1) Acidification treatment with diatomite: soak diatomite in an acid solution with a pH of 4 and stir for 12 hours, age overnight, dry at 110°C, and grind to a particle size of d 90 ≤30μm;

[0033] (2) Mixing of slurry: Take 60 parts of acidified diatomite, 20 parts of titanium dioxide, 5 parts of active component manganese oxide and 5 parts of molding aid polyethylene oxide, add them to the kneader, and then add 350 parts of deionized water were stirred at a speed of 600r / min for 2h, mixed evenly, and a slurry was obtained, which was set aside;

[0034] (3) Extrusion molding: take the slurry prepared in step (2) and mix it in a vacuum mud mill for 3 times, the mixing temperature is 60°C, and the vacuum degree is 0.085MPa; the mixed mixture is placed in a hydraulic extrusion In the machine, the honeycomb denitration catalyst body is obtained by extrusion, and the extrusion pressure is 4Mpa;

[0035] (4) Drying and calcination: take the honeycomb denitration catalyst...

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Abstract

The invention relates to low-cost catalyst and in particular relates to a low-cost honeycomb denitration catalyst and a preparation method thereof. The preparation method of the low-cost honeycomb denitration catalyst comprises the following steps of: pre-treating diatomite by an acidifying method; sufficiently mixing acidified diatomite, titanium dioxide, active materials, forming auxiliaries and deionized water in a certain proportion to form required sizing agent; and molding in an extrusion manner, drying, roasting and cutting according to the requirements to form the final product. Compared with the existing denitration catalyst, the preparation method is low in cost and easy and simple in treatment method; moreover, the catalyst has good denitration activity and abrasion resistance, is capable of reducing the catalyst preparation cost and the denitration engineering cost; besides, the preparation method is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a low-cost catalyst, in particular to a low-cost honeycomb denitration catalyst and a preparation method thereof, belonging to the technical field of catalysis. Background technique [0002] We are rich in coal resources, and the nitrogen oxides produced by coal burning are extremely harmful, not only endangering human health, but also causing serious environmental problems such as acid rain and photochemical smog. In view of the requirements of the "Emission Standards of Air Pollutants for Thermal Power Plants" implemented by the state: since January 1, 2012, the nitrogen oxide emissions of all newly built thermal power units shall not exceed 100 mg / m3; since January 1, 2014, The nitrogen oxide emissions of all thermal power units put into operation in key areas shall not exceed 100 mg / m3, and the units put into operation before 2003 in non-key areas shall not exceed 200 mg / m3. [0003] At present, the main denitrification ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/888B01J23/34B01J23/26B01D53/56B01D53/86
Inventor 张涛肖雨亭汪德志吴刚
Owner JIANGSU LONGYUAN CATALYST CO LTD
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