期刊
INTERNATIONAL CONFERENCE ON ADVANCES IN ENGINEERING 2011
卷 24, 期 -, 页码 436-440出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.proeng.2011.11.2672
关键词
Soot oxidation; Lanthanum stannate oxides; Pyrochlore; Transition metal doping
资金
- National Natural Science Foundation of China [21007019]
- Doctor Foundation of Shandong Province, China [BS2009HZ010]
- Doctor Foundation of University of Jinan, China [XBS0825]
In order to solve the soot emission problems from diesel engines, a series of La2Sn1.8M0.2O7 (M = Sn, Mn, Fe, Co, Cu) oxides with pyrochlore structure were synthesized by co-precipitation, and investigated for soot oxidation with a O-2/NO mixture by Temperature-programmed Oxidation. The incorporation of transition metals strongly influences the crystallite size, surface area and redox properties of the catalysts. All the pyrochlore oxides display catalytic soot oxidation activity with nearly 100% selectivity towards CO2. The doped pyrochlores exhibit higher activities than the undoped, which may be related to the enhancement of reducibility. Among them, La2Sn1.8Mn0.2O7 possessed the best activity with T-i = 341 degrees C. The pyrochlore oxides seem to be a novel active alternative for catalytic soot oxidation. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of ICAE2011.
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