Composite oxide catalyst for cryogenic selective catalystic reductic oxide nitrogen

A nitrogen oxide and catalyst technology, applied in the field of composite oxide catalysts, can solve problems such as poor catalyst activity, and achieve the effects of convenient operation, simple use conditions, and low-cost and easy-to-obtain raw materials

Inactive Publication Date: 2007-09-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor activity of catalysts reported in the past under low temperature conditions, and provide a new catalyst for selective catalytic reduction of nitrogen oxides at low temperatures using ammonia or urea as reducing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0013] Weigh 2.593g of manganese nitrate and 4.718g of cerium nitrate and dissolve them respectively and mix them. Weigh 5.708g of citric acid, prepare a solution, add it dropwise to the metal nitrate mixture obtained above under stirring, and continue stirring for more than 1h. Then it was rotary evaporated to dryness at 70°C, dried overnight at 120°C, and calcined in air at 650°C to obtain Catalyst 1. By changing the amount of metal nitrate and citric acid, catalysts 2 and 3 with different Mn / Ce were prepared in the same way. Finally, sieve into 20-40 mesh size particles for later use.

Embodiment 4-6

[0015] Weigh 1.831g of manganese nitrate and 5.185g of cerium nitrate respectively, dissolve them, mix them, and stir for more than 1 hour. Weigh 2.5g TiO 2 The carrier is immersed in the above solution, and the stirring is continued for more than 1 h. Then it was rotary evaporated to dryness at 70°C, dried overnight at 120°C, and calcined in air at 500°C to obtain catalyst 4. Change TiO 2 The amount of carrier is 5g and 10g, and catalysts 5 and 6 are prepared in the same way. Finally, sieve into 20-40 mesh size particles for later use.

Embodiment 7

[0017] Weigh 6.514g of manganese nitrate and 3.099g of cerium nitrate respectively, dissolve them, mix them, and stir for more than 1 hour. Weigh 10g TiO 2 The carrier is immersed in the above solution, and the stirring is continued for more than 1 h. Then, it was rotary evaporated to dryness at 70°C, dried overnight at 120°C, and calcined in air at 500°C to obtain catalyst 7. Catalysts 8, 9, 10, 11, and 12 were prepared in the same way by replacing Ce with Fe, Co, Ni, Cr, and Cu as the secondary active components. Finally, sieve into 20-40 mesh size particles for later use.

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Abstract

A composite oxide catalyst for removing NOx from the tail gas generated by combustion through low-temp selective catalytic reduction reaction in which ammonia gas or urea is used as reducing agent for reducing the NOx into N2 and H2O is prepared from a composite metallic oxide (whose main component is manganese oxide) and a porous inorganic oxide as carrier through citric acid complexing method.

Description

technical field [0001] The invention relates to a composite oxide catalyst for selective catalytic reduction of nitrogen oxides at low temperature. Nitrogen oxides can be selectively reduced to nitrogen and water at low temperatures. Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants causing air pollution. 57% of them come from stationary sources, such as waste gas generated by the combustion of fossil fuels such as steel, thermal power, cement, and coal-fired boilers. After being irradiated by strong ultraviolet rays from the sun, NOx reacts with hydrocarbons to easily form photochemical smog, which is harmful to the human respiratory system. It is also one of the precursor gases to destroy the atmospheric ozone layer and form acid rain. In recent years, despite the continuous efforts of all parties, the annual average global NOx emissions are still on the rise. Existing NOx emission control measures are divided into combustion process con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J32/00B01J37/02B01D53/56
Inventor 贺泓徐文青余运波张长斌王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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