【摘要】 将La-Mn-O钙钛矿型催化剂与碳黑充分研磨后置于固定床连续流动反应体系中,利用程序升温反应(TPR)技术,对同时催化去除NOx和碳烟的反应进行了实验研究,考察了Ce、K及Cu的掺入对La-Mn-O钙钛矿型催化剂性能的影响。研究结果表明,用适量的Ce或K取代LaMnO3中的La,催化剂的性能可以得到改善,进一步用适量的Cu取代La0.8K0.2MnO3中的Mn,催化剂的性能也得到进一步的提高。用La0.8K0.2Cu0.05Mn0.95O3当作催化剂时,NO向N2的最大转化率达到66.0%,碳黑的起燃温度为290℃,结果表明该催化剂在同时去除NOx和碳烟方面具有较好的选择性和较高的活性。更多还原

【Abstract】 Using temperature programmed reaction (TPR) method, catalytic removal of nitrogen oxides (NOx) and soot with modeled diesel engine exhaust was studied to investigate the effects of different catalysts. The catalysts used in this study are based on perovskite-type oxides LaMnO3. By substituting parts of La and Mn with other cations, La1-xAxByMn1-yO3 (A and B are dopants) were obtained and the catalytic activities of these catalysts were systematically studied. The results indicate that both the selectivity and the activity of catalysts can be improved by doping appropriate cations. By substituting suitable amount of La with Ce or K, the performances of catalysts can be improved. Substituting parts of Mn with Cu at the same time, the performances of catalysts can be improved furthermore. The results show that the comprehensive performance of La0.8K0.2Cu0.05Mn0.95O3 is better than others. When using it as catalyst, the maximum NO conversion into N2 and the ignition temperature of soot are 66.0% and 290℃ respectively. All these prove that this catalyst is a promising one for simultaneous removal of NOx and soot.更多还原