RE perovskite type catalyst for oxidizing NO

A nitric oxide and catalyst technology, which is applied in the field of rare earth perovskite catalysts, can solve the problems of limiting the application of nitric oxide oxidation catalysts, high cost and the like, and achieves the effects of abundant raw materials, convenient operation and simple preparation process.

Inactive Publication Date: 2007-06-06
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the nitric oxide oxidation catalysts commonly used use the noble metal Pt as the active component, supported on Al 2 o 3 On other supports, the loading of noble metals is generally 2-3%, which i

Method used

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  • RE perovskite type catalyst for oxidizing NO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Lanthanum nitrate [La(NO 3 ) 3 ·6H 2 O] 43.3 grams (0.100 moles), cobalt nitrate [Co(NO 3 ) 2 ·6H 2 O] 29.1 g (0.100 mol) was dissolved in 200 ml of deionized water and stirred thoroughly. Citric acid [C 6 h 8 o 7 ·H 2 O] 42.0 g (0.200 mol) was dissolved in 100 ml of deionized water solution and stirred thoroughly, then slowly poured into the metal salt solution, stirred for half an hour, poured into a pear-shaped glass flask, and rotated under reduced pressure at 60-80°C Evaporation, the water was evaporated to dryness to obtain a viscous complex. The precursor was moved to an evaporating dish and dried overnight at 120°C to obtain an expanded dry powder with strong hygroscopicity, which was ground and calcined at 700°C for 2 hours to obtain a black powder sample.

[0017] According to the powder X-ray diffraction analysis results, the powder is made of LaCoO 3 A single crystal composed of a perovskite-type composite oxide. Its specific surface area is 10 m...

Embodiment 2

[0019] Lanthanum nitrate [La(NO 3 ) 3 ·6H 2 O] 34.6 grams (0.080 moles), cerium nitrate [Ce(NO 3 ) 3 ·6H 2 O] 8.7 grams (0.020 moles), cobalt nitrate [Co(NO 3 ) 2 ·6H 2 O] 29.1 g (0.100 mol) was dissolved in 200 ml of deionized water and stirred thoroughly. Others were operated in the same manner as in Example 1 to obtain a black powder sample.

[0020] According to the powder X-ray diffraction analysis results, the powder is made of La 0.9 Ce 0.1 CoO 3 Composite oxides with a perovskite structure and a small amount of CeO 2 and CoO x composed mixture. The specific surface area is 13 m2 / g.

Embodiment 3

[0022] Lanthanum nitrate [La(NO 3 ) 3 ·6H 2 O] 26.0 grams (0.060 moles), cerium nitrate [Ce(NO 3 ) 3 ·6H 2 O] 17.4 grams (0.040 moles), cobalt nitrate [Co(NO 3 ) 2 ·6H 2 O] 14.6 grams (0.050 moles), nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O] 14.5 g (0.050 mol) was dissolved in 200 ml of deionized water and stirred thoroughly. Others were operated in the same manner as in Example 1 to obtain a black powder sample.

[0023] According to the powder X-ray diffraction analysis results, the powder is made of La 0.9 Ce 0.1 co 0.5 Ni 0.5 o 3 Composite oxides with a perovskite structure and a small amount of CeO 2 , NiO x and CoO x composed mixture. The specific surface area is 12 m2 / g.

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Abstract

The present invention relates to provides one kind of RE perovskite type catalyst for catalytic oxidation of NO into NO2, and features that the catalyst includes the perovskite type active component A1-xA'xB1-yB'yO3, where, A represents RE metal element La, A' includes Zr, Ce, Sr, Ca, Ba and Pr, B and B' represent transition metal element Fe, Co, Ni, Mn, Cu or Ti, x is 0-0.9, and y is 0-1.0. The catalyst of the present invention has simple preparation process, low cost, and NO oxidizing activity up to 80 % at 300 deg.c. It may be used to replace noble metal catalyst for oxidizing NO in lean combustion tail gas into NO2 to raise the NOx eliminating rate.

Description

technical field [0001] The invention relates to a rare earth perovskite catalyst for catalyzing the oxidation of nitrogen monoxide into nitrogen dioxide. technical background [0002] As a result of economic development and industrialization, air pollution is becoming more and more serious, especially the air quality in cities is seriously deteriorating. Among various air pollutants, nitrogen oxides (NOx) are a class of pollutants with a large amount of emissions. They are an important factor in the formation of acid rain and photochemical smog, and are harmful to the entire environment and human health. Nitrogen oxides mainly come from the combustion of fuel. With the increasing control of air pollutant emissions around the world, several tail gas treatment technologies for nitrogen oxides have been developed, including nitrogen oxide storage and reduction technology (NSR: the technique of NOx storage and reduction), nitrogen oxides Simultaneous removal of pollutants and ...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86B01D53/94B01J23/00
CPCY02A50/20
Inventor 贺泓温雨鑫张长斌余运波王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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