Denitrification catalyst for high-temperature flue gas and preparation method thereof

A denitrification catalyst and high-temperature flue gas technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high catalyst denitrification activity and high cost of molecular sieve catalysts problem, to achieve the effect of low cost, simple preparation method and good high temperature activity

Active Publication Date: 2017-05-03
JIANGSU LONGYUAN CATALYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the disadvantages that the existing catalysts are not suitable for use when the temperature of flue gas such as natural gas is high and the cost of molecular sieve catalysts is high, and to provide a simple preparation method and low cost for high-temperature flue gas Denitrification catalyst and preparation method thereof, the prepared catalyst has higher denitrification activity

Method used

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  • Denitrification catalyst for high-temperature flue gas and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The composition of the denitration catalyst is W10% / Ce 0.2 Zr 0.8 o 2 Add 1.82g of ammonium paratungstate, 8.68g of cerium nitrate hexahydrate, and 34.34g of zirconium nitrate pentahydrate into 400ml of deionized water, stir until the solids are completely dissolved, then add 12.00g of urea, stir until evenly mixed, heat the solution in a water bath to 100°C and keep it warm Take it out after 4 hours, age it at room temperature for 4 hours, and then dry it in a blast drying oven at 80°C for 10 hours. After drying, put it in a muffle furnace for calcination at 600°C for 5 hours, cool to room temperature, take it out and grind it fully, and pass it through a 40-mesh sieve. The denitrification catalyst is obtained after sieving.

[0020] The specific surface area of ​​the prepared denitration catalyst was measured by the American Beckman SA3100TM specific surface area analyzer to be 102.5m 2 / g.

Embodiment 2

[0022] The composition of the denitration catalyst is W10%-Fe4% / Ce 0.2 Zr 0.8 o 2 , Accurately weigh 1.82g ammonium paratungstate, 2.80g ferric nitrate nonahydrate, 8.68g cerium nitrate hexahydrate, 34.34g zirconium nitrate pentahydrate and add them to 400ml deionized water in turn, stir until the solid is completely dissolved, then add 12.83g urea, stir until Mix evenly, heat the solution in a water bath to 90°C for 6 hours, take it out, age at room temperature for 6 hours, then place it in a blast drying oven at 70°C for 11 hours, and put it into a muffle furnace for calcination at 600°C for 4 hours after drying. Cool to normal temperature, fully grind, and sieve through a 40-mesh sieve to prepare a denitrification catalyst.

[0023] The specific surface area of ​​the prepared denitration catalyst was measured by the American Beckman SA3100TM specific surface area analyzer to be 99.8m 2 / g.

Embodiment 3

[0025] The composition of the denitration catalyst is W20%-Fe4% / Ce 0.2 Zr 0.8 o 2 , add 4.08g ammonium paratungstate, 2.80g ferric nitrate nonahydrate, 8.68g cerium nitrate hexahydrate, 34.34g zirconium nitrate pentahydrate into 400ml deionized water, stir until the solid is completely dissolved, then add 12.83g urea, stir until evenly mixed, and The solution was heated in a water bath at 100°C for 4h, taken out, aged at room temperature for 4h, and then dried in an 80°C blast oven for 12h. After drying, it was placed in a muffle furnace for calcination at 600°C for 5h, cooled to room temperature, and fully Grind and sieve through a 40-mesh sieve to obtain a denitrification catalyst.

[0026] The specific surface area of ​​the prepared denitration catalyst was measured by the American Beckman SA3100TM specific surface area analyzer to be 108.3m 2 / g.

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Abstract

The invention relates to a denitration catalyst for high-temperature smoke and a preparation method of the denitration catalyst. According to the denitration catalyst, a rare earth oxide-zirconium oxide compound oxide is used as a carrier, and a mol ratio of a rare earth oxide to zirconium oxide is 1:10-10:1; a main catalyst is tungsten oxide or molybdenum oxide or a mixture of tungsten oxide and molybdenum oxide, the content of the main catalyst is 10-40 weight percent, a cocatalyst is a transition metal, and the content of the cocatalyst is 1-4 weight percent. The preparation method comprises the following steps: dissolving all raw materials in deionized water, heating a solution in a water bath to 90-100 DEG C and insulating for 4-6h, then ageing and drying, then calcining at a temperature of 550-600 DEG C for 3-5h, grinding, and sieving to prepare the denitration catalyst. The preparation method disclosed by the invention is simple; the prepared denitration catalyst is suitable for treating a fuel gas or oil high-temperature unit, can be used at a high temperature of 450-600 DEG C, has a good selectivity, is relatively low in cost in comparison with a molecular sieve, has relatively good high-temperature activity, heat stability and denitration activity, and has a denitration rate of reaching above 80 percent.

Description

technical field [0001] The invention relates to a denitration catalyst for high-temperature flue gas and a preparation method thereof, belonging to the technical field of catalyst synthesis and preparation. Background technique [0002] China's coal-fired power plants consume 1.7 billion tons of coal each year, accounting for 51% of the country's coal production. Coal-fired power plants are the largest source of air pollution in the country and one of the main sources of atmospheric nitrogen oxide pollutants in the country. From January 1, 2012, China will implement the world's most stringent "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), and the Ministry of Environmental Protection has issued a notice to fully start denitrification. [0003] NH 3 - The SCR method is one of the mature and effective methods for implementing nitrogen oxide emissions in the thermal power industry. Catalyst activity, mechanical strength, anti-poisoning performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01J23/28
Inventor 白伟张涛肖雨亭李年华刘长松
Owner JIANGSU LONGYUAN CATALYST CO LTD
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