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Small-pore catalyst for fuel gas denitration and preparation method

A technology with small pore size and catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc. The effect of easy industrial production, easy release, and large number of holes

Inactive Publication Date: 2017-09-29
河南康宁特环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a small-aperture catalyst for denitrification of gas and its preparation method. The catalyst overcomes the problems of large pore size, easy deactivation at high temperature, low catalytic efficiency, and easy falling off and wear of active substances.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] A small-aperture catalyst for gas denitrification, prepared by the following method:

[0024] 1) Ball milling: Mix 60g of carrier aluminum titanate, 30g of zirconia and 10g of tungsten oxide evenly, then add 1.22g of nickel nitrate, 0.69g of chromium nitrate and 0.97g of ruthenium nitrate, 0.3g of ethyl orthosilicate, hydroxypropyl Mix 0.1g of methyl cellulose, 0.1g of tung oil, 0.1g of aluminum dihydrogen phosphate, 0.05g of graphite and 0.05g of calcined kaolin, then add 150g of deionized water, use d 90 A grinding body with a particle size of 4.8 μm was ball milled for 8 hours.

[0025] 2) Kneading: kneading the mixture in step 1) for 240 minutes to obtain mud, the mud reaches a moisture content of 30.5% and a plasticity index of 9-12;

[0026] 3) Embryo making: put the mud in step 2) into a medium with a vacuum degree of -0.09 MPa and practice the mud three times, stale at room temperature for 36 hours, pressurize at 15 MPa and filter once with a 200-mesh screen, k...

Embodiment 2

[0031] A small-aperture catalyst for gas denitrification, prepared by the following method:

[0032] 1) Ball milling: Stir and mix the carrier aluminum titanate 50g, zirconia 30g and tungsten oxide 20g evenly, then add 2.07g nickel sulfate, 1.38g chromium nitrate and 1.27g ruthenium chloride, 0.1g ethyl orthosilicate, hydroxypropyl 0.05g of methyl cellulose, 0.5g of tung oil, 0.1g of aluminum dihydrogen phosphate, 0.05g of graphite, and 0.1g of calcined kaolin were mixed, and then 250g of deionized water was added. 90 A grinding body with a particle size of 4.5 μm was ball milled for 12 hours.

[0033] 2) Kneading: kneading the mixture in step 1) for 120 minutes to obtain a mud material, the mud material has a moisture content of 29.3% and a plasticity index of 9;

[0034] 3) Embryo making: put the mud in step 2) into a medium with a vacuum degree of -0.095 MPa and practice the mud three times, stale at room temperature for 72 hours, pressurize at 8 MPa and filter it with a 4...

Embodiment 3

[0039] A small-aperture catalyst for gas denitrification, prepared by the following method:

[0040]1) Ball milling: Stir and mix the carrier aluminum titanate 60g, zirconia 30g and tungsten oxide 10g evenly, then add 60g aluminum titanate, 30g zirconia and 10g tungsten oxide, 0.87g nickel chloride, 1.59g chromium chloride and 0.85 g ruthenium acetate, 0.3g tetraethyl orthosilicate, 0.1g hydroxypropyl methylcellulose, 0.3g tung oil, 0.1g aluminum dihydrogen phosphate, 0.1g graphite and 0.1g calcined kaolin, add 190g deionized water after mixing , using d 90 A grinding body with a particle size of 3.9 μm was ball milled for 10 h.

[0041] 2) Kneading: Kneading the mixture in step 1) for 200 minutes to obtain a mud material, the mud material has a moisture content of 28.9% and a plasticity index of 11;

[0042] 3) Embryo making: put the mud in step 2) into a medium with a vacuum degree of -0.093 MPa and practice the mud three times, stale at room temperature for 60 hours, pres...

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Abstract

The invention discloses a small-pore catalyst for fuel gas denitration and a preparation method. The small-pore catalyst is prepared from the following raw materials in parts by weight: 100 parts of a carrier, 2.20-8.21 parts of an active component precursor, 0.45-1.4 parts of aids and 150-250 parts of deionized water, wherein the carrier comprises aluminum titanate, zirconium oxide and tungsten oxide; the active component precursor comprises a nickel salt, a chromium salt and a ruthenium salt; and the aids comprise tetraethoxysilane, hydroxypropyl methyl cellulose, tung oil, aluminum dihydrogen phosphate, graphite and calcined kaolin. The preparation method comprises the following step: 1) performing ball milling; 2) kneading the raw materials; 3) blanking; 4) shaping blanks; and 5) calcining the blanks. The small-pore catalyst is applicable to nitric oxide removal of gas turbine sets, has the advantages of being high in denitration efficiency, small in size, long in service life and the like, has good application prospects, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis and preparation, and in particular relates to a small-aperture catalyst for gas denitrification and a preparation method. Background technique [0002] On January 1, 2012, the new "Emission Standards of Air Pollutants for Thermal Power Plants" came into effect, specifying the limits of nitrogen oxide emission standards for coal-fired power plants, oil and gas boilers, and gas turbines. Under current technical conditions, large gas turbine NO X The emission is basically 50mg / Nm 3 The following areas or cities that can meet the national standard emission requirements and have stricter air pollution control policies, such as Beijing, have proposed the most stringent NO emission standards in China. X Emission concentration limit 30mg / Nm 3 . Therefore, the flue gas must be denitrified. The flue gas emitted by boilers fueled by natural gas has the characteristics of high temperature (4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10
CPCB01J23/002B01J23/8993B01J2523/00B01J35/618B01J35/617B01J35/647B01J2523/41B01J2523/47B01J2523/48B01J2523/67B01J2523/69B01J2523/821B01J2523/847
Inventor 张涛周彦霞张天天杨晓向钱晓东罗少鹏
Owner 河南康宁特环保科技股份有限公司
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