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Multiple-effect catalyst for synergistically purifying fume of biomass boiler and preparation method thereof

A biomass boiler and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve problems such as hindering gas adsorption, catalyst poisoning and catalytic activity decline, and changes in the form of active components. Strong immunity, long service life, reduced investment and operating costs

Active Publication Date: 2014-04-30
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the biomass boiler flue gas contains high content of Na, K, Ca, these substances will occupy the acidic sites on the catalyst, hinder the adsorption of gas on the catalyst surface, lead to the poisoning of the catalyst and the decline of catalytic activity, and will interact with the active group Partial combination, resulting in a change in the form of the active ingredient
At present, the selective catalytic reduction and denitrification technology of biomass boilers has been developed abroad, but the deactivation rate of the catalyst is found to be dozens of times that of coal-fired power plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of a multi-effect catalyst for synergistic purification of biomass boiler flue gas includes the following steps:

[0033] (1) Preparation of carrier: take 0.1g zirconium dioxide and 2.7935g ceria (the Ce / Zr molar ratio is 20), add 5mL absolute ethanol, mix mechanically in a ball mill for 12h, dry at 30℃, and roast at 350℃ for 1h , The cerium-zirconium solid solution is obtained; then the cerium-zirconium solid solution is added to a 0.1mol / L sulfuric acid solution, immersed for 2h, then dried at 30°C, and calcined at 350°C for 1h to obtain a sulfated cerium-zirconium solid solution; finally, the sulfated cerium-zirconium solid solution The solid solution and 0.9g alumina were put into a ball mill and mixed for 6 hours to prepare a catalyst carrier. At this time, the mass ratio of alumina to cerium-zirconium solid solution was about 0.3;

[0034] (2) Load of active components and additives: Take 0.002g of silver nitrate, 0.032g of barium hydroxide, and 0....

Embodiment 2

[0037] A preparation method of a multi-effect catalyst for synergistic purification of biomass boiler flue gas includes the following steps:

[0038] (1) Carrier preparation: Take 2.1478g zirconium dioxide and 0.1g ceria (the Ce / Zr molar ratio is 0.05), add 5mL absolute ethanol, mix mechanically in a ball mill for 12h, dry at 120℃, and roast at 800℃ for 15h , The cerium-zirconium solid solution is obtained; then the cerium-zirconium solid solution is added to a 10mol / L sulfuric acid solution, immersed for 48h, then dried at 120°C, and calcined at 800°C for 15h to obtain a sulfated cerium-zirconium solid solution; finally, the sulfated cerium-zirconium solid solution Put 2.3g alumina into a ball mill and mix for 6 hours to prepare a catalyst carrier. At this time, the mass ratio of alumina to cerium-zirconium solid solution is about 1;

[0039] (2) Load of active components and additives: Take 0.9 g of platinum nitrate, 1.42 g of barium carbonate, and 2.15 g of lanthanum nitrate, an...

Embodiment 3

[0042] A preparation method of a multi-effect catalyst for synergistic purification of biomass boiler flue gas includes the following steps:

[0043] (1) Carrier preparation: Dissolve 2.7g of cerium nitrate and 2.1g of zirconyl nitrate in 10mL of deionized water, use 4mol / L ammonium bicarbonate for precipitation under rapid stirring, adjust the pH to 9, and immerse for 3h after fully stirring, and vacuum The precipitate is obtained by suction filtration. The precipitate is dried at 100°C and calcined at 500°C for 9 hours to obtain a cerium-zirconium solid solution; then the cerium-zirconium solid solution is added to a 5mol / L sulfuric acid solution, immersed for 24h, then dried at 100°C, and calcined at 500°C 9h to obtain a sulfated cerium-zirconium solid solution; finally, the sulfated cerium-zirconium solid solution and 18g alumina are put into a ball mill and mixed for 6h to prepare a catalyst carrier. At this time, the mass ratio of alumina to cerium-zirconium solid solution i...

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Abstract

The invention discloses a multiple-effect catalyst for synergistically purifying fume of a biomass boiler and a preparation method of the multiple-effect catalyst. According to the multiple-effect catalyst, noble metal is used as an active component, a mixture of aluminum oxide and an acidulated cerium-zirconium solid solution is used as a carrier, and barium oxide and light rare earth metal are used as additives. Under the action of the catalyst, NOx is selectively reduced into nitrogen through CO and hydrocarbon VOCs, the excessive CO and various VOCs are thoroughly oxidized to generate CO2 and water; by adopting the catalyst, the purification efficiency on NOx is higher than 95%, the purification efficiency on CO is higher than 90%, the purification efficiency on VOCs is higher than 85%, moreover, compared with combination of single pollutant control technique, the catalyst can simultaneously purify multiple pollutants, and the investment cost and the operation cost can be effectively lowered.

Description

Technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a multi-effect catalyst for synergistic purification of biomass boiler flue gas and a preparation method thereof. Background technique [0002] Biomass boilers have developed rapidly in my country in recent years. According to the "Renewable Energy Medium and Long-term Development Plan", by 2020, the total installed capacity of biomass power generation will reach 30 million kilowatts, and the annual utilization of biomass solid briquettes will reach 50 million tons. . Because biomass boilers burn biomass or mix coal / biomass, the composition of combustion flue gas pollutants is complicated, mainly containing particulate matter, acid gas, CO, NOx, VOCs and other pollutants. The pollution has caused concern and concern. Therefore, the development of biomass boiler flue gas pollution control work will soon enter the agenda. [0003] Compared with the flue gas of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/055B01D53/86B01D53/56B01D53/62
CPCY02A50/20
Inventor 岑超平陈雄波方平唐志雄曾文豪
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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