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中文摘要：
采用低温燃烧法制备了Ce^4＋部分取代La^3＋的La1-xCexCoO3系钙钛矿型复合氧化物催化剂，用XRD、TGA、SEM和化学分析等方法对催化剂的组成、结构等进行了表征。利用程序升温反应（TPR）技术，对催化剂应用于柴油机常规排放物中的微粒（PM）、碳氢化合物（THC）、氮氧化合物（NOx）的催化脱除性能进行了研究。结果表明，Ce^4＋部分取代Lan^3＋，催化剂表面氧空位浓度增加，同时形成Co^3＋-Co^2＋共存体系，催化剂对THC、NOx催化活性显著提高，且稳定性良好。但Ce^4＋的掺杂并没有提高催化剂对PM的催化活性。
英文摘要：
A series of complex oxide La1-xCexCoO3 catalysts were synthesized at low temperature through a combustion process, in which x is among 0, 0.1, 0.2, 0.4 and 0.6 corresponding to the quantity of La^3＋ partial substitution by Ce^4＋ And the catalysts were characterized for phase composition using chemical analysis and x-ray diffraction. The surface characterization of the catalysts was determined by SEM. The catalytic activity of the catalysts in removal of NOx , THC and particulate matter （PM） from diesel exhaust gases were examined in details using temperature-programmed reaction （TPR） technique. The results show that after partial substitution of La3. with Ce^4 ＋ the oxygen vacancy concentration increases significantly and Co^3＋ -Co^2＋ system is formed , and consequently the catalytic activity in removal of THC and NOx is significantly improved. But for PM, the effect is not so obvious, and the possible catalytic mechanism was also presented. The doped catalysts also show good stability.
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