期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 31, 期 3, 页码 183-194出版社
ELSEVIER
DOI: 10.1016/S0926-3373(00)00279-4
关键词
perovskite; catalytic combustion of CH4; mixed iron phases; SrFeO3-x; CeOx; synergy
The catalytic deep oxidation of methane over perovskite-type mixed oxide catalysts is examined. Three groups of mixed oxides (i) La1-yCeyFeO3 (0.0 < y less than or equal to 0.5), (ii) La1-xSrxFeO3 (0.01 < x less than or equal to 0.5) and (iii) La1-x-ySrxCeyFeO3 (0.0 < x, y less than or equal to 0.3), containing La, Sr, Ce, Fe cations in various ratios were prepared and characterized by XRD, Mossbauer spectroscopy and O-2-TPD measurements. The catalysts are active in the temperature range of 440-740 degreesC. A maximum of activity appears for y = 0.3, in the series La1-yCeyFeO3 in a wide temperature range. The increase of Sr content in the series La1-xSrxFeO3 results in the enhancement of the reaction rates which is related to the presence of SrFeO3-x crystal phase that favors the surface reaction. The double substituted solids La1-x-ySrxCeyFeO3 show higher catalytic activity as compared to the activity of the two other examined perovskitic series which is related to the bifunctional synergistic action of CeO2 and SrFeO3-x crystal phases in the solids. (C) 2001 Elsevier Science B.V. All rights reserved.
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