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Medium/low-temperature core-shell denitration catalyst and preparation method and application thereof

A denitrification catalyst, core-shell type technology, applied in the field of medium and low temperature core-shell type denitrification catalyst and its preparation, can solve the problems of solid poison poisoning, etc., and achieve the effect of maintaining stability, good selectivity, and simple and effective preparation method

Active Publication Date: 2013-02-27
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts have disadvantages such as being easily poisoned by solid poisons such as alkali metals / alkaline earth metals in flue gas or having poor selectivity.
[0005] At present, a large number of patents at home and abroad have disclosed various types of denitrification catalysts and preparation processes, but there is a great lack of denitrification catalysts with strong selectivity, strong anti-poisoning performance and excellent medium and low temperature activity.

Method used

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  • Medium/low-temperature core-shell denitration catalyst and preparation method and application thereof
  • Medium/low-temperature core-shell denitration catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Pretreatment of titanium-based nanotubes: titanium-based nanotubes are hydrotitanic acid nanotubes prepared by strong alkali hydrothermal method, with an inner diameter of 3-5nm, an outer diameter of 7-15nm, and a length of 50-300nm; Soak in excess acetone solution at room temperature for 12 hours, filter with suction and set aside.

[0037] Preparation of wide-temperature core-shell denitration catalyst: Take 2g of pretreated hydrogen titanate nanotubes, add 2.5mL of manganese nitrate solution with a mass fraction of 50%, 0.7583g of cerous nitrate (dissolved in 50mL of water), and Stir and impregnate for 12 hours, then dry at 60°C, heat up to 400°C at a rate of 5°C per minute and bake for 2 hours to obtain a wide temperature core-shell denitration catalyst.

[0038] Catalyst activity and selectivity test: put 0.5g of the prepared catalyst into a fixed bed reactor for activity and selectivity test, the test reaction temperature is 80-450°C, and the space velocity is abo...

Embodiment 2

[0041] Pretreatment of titanium-based nanotubes: titanium-based nanotubes are sodium titanate nanotubes prepared by strong alkali hydrothermal method, with an inner diameter of 3-5nm, an outer diameter of 7-15nm, and a length of 50-300nm; Soak in excess ethanol solution at room temperature for 12 hours, filter with suction and set aside.

[0042] Preparation of low-temperature core-shell denitration catalyst: Take 2g of pretreated sodium titanate nanotubes, add 2.5mL of manganese nitrate solution with a mass fraction of 50%, 0.06g of cerium ammonium nitrate (dissolved in 50mL of water), and stir at room temperature Immerse for 4 hours, then dry at 60°C, heat up to 400°C at a rate of 10°C per minute and bake for 4 hours to obtain a low-temperature core-shell denitration catalyst.

[0043] Catalyst activity and selectivity test: put 0.5g of the prepared catalyst into a fixed bed reactor for activity and selectivity test, the test reaction temperature is 80-450°C, and the space v...

Embodiment 3

[0046] Pretreatment of titanium-based nanotubes: titanium-based nanotubes are sodium titanate nanotubes prepared by strong alkali hydrothermal method, with an inner diameter of 3-5nm, an outer diameter of 7-15nm, and a length of 50-300nm; Put it in excess xylene solution and soak it at room temperature for 6 hours, then filter it with suction and set aside.

[0047] Preparation of medium-temperature core-shell denitration catalyst: Take 2g of pretreated sodium titanate nanotubes, add 0.12g of manganese sulfate (dissolved in 25mL of water), 0.51g of cerium sulfate (dissolved in 25mL of water), stir and impregnate at room temperature 16 hours, then dried at 80°C, and then heated to 450°C at a rate of 15°C per minute and calcined for 5 hours to obtain a medium-temperature core-shell denitration catalyst.

[0048] Catalyst activity and selectivity test: put 0.5g of the prepared catalyst into a fixed bed reactor for activity and selectivity test, the test reaction temperature is 80...

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Abstract

The invention discloses a medium / low-temperature core-shell denitration catalyst and a preparation method and application thereof, belonging to the technical field of air pollution control. Main raw materials consist of a titanium-based nano tube, soluble salt of cerium and soluble salt of manganese, wherein a carrier shell of the catalyst is formed by the titanium-based nano tube, and an active nanoparticle core is formed by oxides of cerium and manganese. The molar ratio of the total amount of cerium and manganese to the amount of titanium is (0.02-0.12):1, the molar ratio of cerium to manganese is more than 0.5 or less than 0.25, and when the molar ratio of cerium to manganese is between 0.25 and 0.5, the catalyst has good activity in a medium-temperature zone, a low-temperature zone and a medium / low-temperature zone. The preparation method comprises the steps of soaking the titanium-based nano tube in an organic solvent, adding the soluble salt of cerium and the soluble salt of manganese, impregnating, drying and roasting, thereby obtaining the medium / low-temperature core-shell denitration catalyst. The catalyst has broad application prospects in treatment of waste gases with high contents of solid toxic components, such as exhaust gas of industrial furnaces, flue gas of power plants using biomass fuels and the like.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a medium-low temperature core-shell denitrification catalyst and its preparation method and application. Background technique [0002] The fixed emission sources of nitrogen oxides are mainly coal-fired boilers, glass furnaces and cement furnaces, which are the key objects of nitrogen oxide control in my country. Selective catalytic reduction (SCR) denitrification technology is the flue gas denitrification technology with the widest application, the highest market share and the most stable and reliable operation in the world. [0003] At present, most SCR denitrification devices use V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -MoO 3 / TiO 2 Catalyst, this type of vanadium-based catalyst has the advantages of high activity and good selectivity, but it also has a narrow activity temperature window (mostly concentrated at 300-450°C), and is prone to poisoning by solid poiso...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/889B01D53/90B01D53/56
Inventor 岑超平陈雄波唐志雄曾环木陈志航陈定盛方平钟佩怡唐子君
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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