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Preparation method and application of Lal-xSrxCoO3 perovskite catalyst

A perovskite and catalyst technology, applied in the field of La1-xSrxCoO3 perovskite catalysts, can solve the problem of expensive use of precious metal Pt, and achieve the effect of simple preparation process, low preparation cost and good performance

Inactive Publication Date: 2010-09-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used Pt / Ba-Al-O catalyst, due to the use of noble metal Pt is more expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Weigh 7.4g La(NO 3 ) 3 ·6H 2 O, 0.9g Sr(NO 3 ) 3 , 6.2g Co(NO 3 ) 3 ·6H 2 O, and dissolve it in 100ml deionized water, ultrasonically vibrate to form solution A, weigh 8.9g CA and dissolve it in 85ml deionized water and ultrasonically vibrate to form citric acid solution B, then weigh 18.6g EDTA and dissolve it in 125ml deionized water for ultrasonication Vibrate to form ethylenediaminetetraacetic acid solution C, mix the solutions A, B, and C to form 310ml of solution D, then adjust the pH of solution D to 4.6 with ammonia water to obtain a clear grape purple solution, and place it in a water bath at 80°C Stir and evaporate to dryness to a purple sol state; place in an oven at 120°C for drying. The dried samples were first roasted at 5°C / min to 300°C for 2 hours to decompose EDTA and citric acid, and then fired at 5°C / min to 700°C for 8 hours to form a perovskite structure. The prepared catalyst is ground and sieved to obtain 40-60 mesh La 0.8 Sr 0.2 CoO 3 s...

Embodiment 2

[0014] Prepare La with embodiment 1 method 0.7 Sr 0.3 CoO 3 Sample, where x is 0.3, the amount of each raw material used is respectively: 6.6g La(NO 3 ) 3 ·6H 2 O, 1.4g Sr(NO 3 ) 3 , 6.3g Co(NO 3 ) 3 ·6H 2 O, 9.1 g CA, 19.0 g EDTA. The prepared sample has a specific surface area of ​​19.1m 2 / g, NO x Storage performance test, the method is: the gas volume composition is 800ppmNO, 5%O 2 , N 2 As balance gas, air speed is 8×10 5 h -1 Under the condition of 500mg sample isothermally adsorbed NO at 300℃ x . Continuous monitoring of NO in exhaust gas x concentration as a function of reaction time. Adsorb NO x The concentration was detected by Model 42i-HL nitrogen oxide analyzer (Thermo Scientific, chemiluminescence detector). The test result is: NO x The storage capacity is 2595 μmol / g, and the conversion rate of NO is 72.8%.

Embodiment 3

[0016] Prepare La with embodiment 1 method 0.6 Sr 0.4 CoO 3 Sample, where x is 0.4, the amount of each raw material used is respectively: 5.8g La(NO 3 ) 3 ·6H 2 O, 1.9g Sr(NO 3 ) 3 , 6.4g Co(NO 3 ) 3 ·6H 2 O, 9.3g CA, 19.4g EDTA. The prepared sample has a specific surface area of ​​11.6m 2 / g. NO x Storage performance test, the method is: the gas volume composition is 800ppm NO, 5% O 2 , N 2 As balance gas, air speed is 8×10 5 h -1 Under the condition of 500mg sample isothermally adsorbed NO at 300℃ x . Continuous monitoring of NO in exhaust gas x concentration as a function of reaction time. Adsorb NO x The concentration was detected by Model 42i-HL nitrogen oxide analyzer (Thermo Scientific, chemiluminescence detector). The test result is: NO x The storage capacity is 2000 μmol / g, and the conversion rate of NO is 70.4%.

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Abstract

The invention relates to a preparation method and application of a Lal-xSrxCoO3 perovskite catalyst. The preparation method comprises the following steps of: mixing the nitrites of La, Sr and Co, adjusting pH to 4-5 to form sol in presence of citric acid and EDTA (Ethylene Diamine Tetraacetic Acid) which are used as complexing agents, drying and baking to prepare a perovskite sample, and grinding and screen to obtain the catalyst. The prepared Lal-xSrxCoO3 perovskite catalyst is used for eliminating nitric oxides in automobile exhausts in a storage mode. The invention has the advantages that the preparation and test process is simple, raw material can not be noble metal, and the preparation cost is greatly reduced. The prepared Lal-xSrxCoO3 perovskite catalyst has high storage of nitric oxides, and greatly improves the efficiency for eliminating NOx in the automobile exhaust.

Description

technical field [0001] The present invention relates to a kind of La 1-x Sr x CoO 3 Preparation and application of perovskite catalysts, belonging to La 1-x Sr x CoO 3 Perovskite catalyst technology. Background technique [0002] In recent years, it has been used to purify automobile exhaust pollutants nitrogen oxides (NO x ) catalyst research is very active. With the increasingly stringent environmental emission regulations, in order to improve fuel economy and reduce CO 2 emissions, lean burn technology has been extensively developed. NO x Storage reduction (NSR) technology has been practically used in lean-burn engine vehicles with low-sulfur content fuels. Commonly used Pt / Ba-Al-O catalysts are expensive due to the use of noble metal Pt. La 1-x Sr x CoO 3 Perovskite catalysts are often used as cathode materials for solid oxide fuel cells, oxygen-sensitive materials and oxidation catalysts, etc., with high redox activity, low price, good anti-sintering perfo...

Claims

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Application Information

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IPC IPC(8): C09K11/78B01D53/86B01D53/56
Inventor 李新刚邹鸿鹄孟明贤晖
Owner TIANJIN UNIV
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