Wide-temperature high-efficiency catalyst for NOx removal by ammonia selective catalytic reduction ]and preparation method thereof

A catalyst and selectivity technology, which is applied in the field of wide-temperature and high-efficiency ammonia selective catalytic reduction to remove NOx and its preparation field. It can solve the problems of complex production process, high carrier cost, and potential safety hazards, and achieve tolerance to nitrate particles. , The preparation process is simple and the effect of high purification precision

Active Publication Date: 2014-06-25
DALIAN CATALYTIC ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using activated carbon fiber as a carrier will bring problems such as complex production process, high carrier cost, high energy consumption and potential safety hazards in the industrial production process, and under working conditions, the temperature is 200 ° C, the gas contains 2-4% O 2 , long-term operation is a severe test for the strength and life of activated carbon fibers, so there is still a certain distance from industrial application
Especially not suitable for the two-sodium salt tail gas treatment process that requires washing and regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of the carrier: Take 200g of alumina powder roasted at 600°C, add 200g of aluminum hydroxide, 100g of butyl titanate, and 500g of pseudoboehmite powder and mix thoroughly; use 50ml of nitric acid solution with a volume concentration of 5% to spray and roll Form into small balls of φ3-4, dry at 120°C for 4 hours, and bake at 500°C for 4 hours to obtain the carrier for use;

[0028] Take 5g of copper nitrate, 10g of manganese nitrate (mass concentration 50%) solution, 4g of lanthanum cerium carbonate, mix and dissolve, impregnate 100g of the above carrier, dry at 120°C for 4 hours, and roast at 400°C for 4 hours to obtain the catalyst of the present invention.

[0029] Evaluation conditions: Airspeed 10000h -1 , NH 3 / NO=1.1, NO inlet 1000ppm, O 2 Content 3.4%, normal pressure;

[0030] Evaluation results: when the catalyst is at 110°C, the NO outlet concentration is 100ppm, and at 130°C-290°C, the outlet NO is 0-6PPm, and the conversion rate is close to 10...

Embodiment 2

[0034] Take 5g of copper nitrate, 15g of manganese nitrate solution (50%), 2.5g of cerium nitrate, 1.0g of neodymium nitrate, and 1.0g of yttrium nitrate, mix and dissolve, impregnate 100g of the carrier in the above example 1, dry at 120°C for 4 hours, and bake at 600°C After 4 hours, the catalyst of the present invention was obtained.

[0035] Evaluation conditions: Airspeed 10000h -1 , NH 3 / NO=1.1, NO inlet 1000ppm, O 2 Content 3.4%, normal pressure;

[0036] Evaluation results: the catalyst has a wide operating temperature window, and the NO outlet concentration is lower than 100ppm in the temperature range of 150-390°C.

Embodiment 3

[0038] Preparation of the carrier: Take 200g of alumina powder roasted at 500°C, add 400g of aluminum hydroxide, and 400g of pseudoboehmite powder and mix thoroughly; use 150ml of nitric acid solution with a volume concentration of 10% to spray and roll to form a small diameter of φ3-4mm. The balls were dried at 120°C for 4 hours and calcined at 500°C for 4 hours to obtain the carrier for later use;

[0039] Take 5g of copper nitrate, 15g of manganese nitrate solution (50%), 2.5g of cerium nitrate, 1.0g of neodymium nitrate, and 1.0g of yttrium nitrate, mix and dissolve, impregnate 100g of the above carrier, dry at 120°C for 4 hours, and bake at 600°C for 4 hours to obtain Catalyst of the present invention.

[0040] Evaluation conditions: Airspeed 2000h -1 , NH 3 / NO=1.1, NO inlet 10000ppm, O 2 Content 3.4%, normal pressure;

[0041] Evaluation result: NO outlet concentration is less than 100ppm in the temperature range of 100-400°C.

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PUM

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Abstract

The invention belongs to the technical field of catalysts and especially provides a wide-temperature high-efficiency NOx removal catalyst for ammonia selective catalytic reduction and a preparation method thereof. The catalyst consists of an active component, an auxiliary agent and a carrier. The weight of the active component accounts for 2%-10% of the weight of the catalyst, and the weight of the auxiliary agent accounts for 0.5%-7% of the weight of the catalyst. The active component is composed of a cupric oxide and/or a manganese oxide; the auxiliary agent is a mischmetal, a rare earth oxide or a transition metal oxide; and the carrier is Al2O3 or TiO2-Al2O3. The catalyst is particularly prepared by the steps of a drying operation and a roasting operation at a proper temperature. An NOx removal process at a wide temperature zone ranging from 100 DEG C to 400 DEG C can be achieved by the catalyst of the invention; meanwhile, the catalyst can be repeatedly used in normal after being washed and regenerated for several times in a nitrate tail gas denitration technology, and the catalytic intensity and the denitration performance are not decreased obviously. The catalyst of the invention is industrialized and has excellent industrial application prospect.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a wide-temperature and high-efficiency ammonia selective catalytic reduction to remove NO x Catalysts and their preparation methods. Background technique [0002] NO x It is one of the main pollutants in the atmospheric environment, with a large amount and a wide area, which poses a great threat to human health. Therefore, countries contain NO x There are strict restrictions on the emission of industrial exhaust gas, and the standards are becoming more and more stringent, so for NO x governance is very important. Currently, Governance NO x There are many methods of research, among which the selective catalytic reduction of ammonia to remove NO x As preferred, the main responses are: [0003] 4NO+4NH 3 +O 2 —4N 2 +6H 2 o [0004] 2NO 2 +4NH 3 +O 2 —3N 2 +6H 2 o [0005] Purification and removal of nitrogen oxides under medium and low temperature conditions, such as sodium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/90B01D53/56
Inventor 刘振峰杜霞茹付桂芝李锋肖菲吴熠任宪平夏元有张东辉李楠
Owner DALIAN CATALYTIC ENG TECH
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