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一、引言 随着汽车工业的发展,汽车排气带来的环境污染问题日益突出。用于汽车排气净化催化剂的铂系金属,成本昂贵,资源缺乏,应找寻新的替代催化剂。自从1971年Libby提出稀土钙钛矿型催化剂可望用于汽车排气净化以来,各国先后开展研究,并且研究范围扩展到各种稀土复合氧化物,其氧化活性很高,但存在着严重的SO_2中毒问题。 本文对该类催化剂的SO_2中毒及再生进行了考察。通过比较,找到了抗SO_2中毒较好的催化剂,并发现了行之有效的对抗毒不足进行补偿的低温再生法。对该抗毒较好的催化剂改变反应条件,考察SO_2中毒情况,说明只要选择适当条件,该催化剂具有很大实际应用价值。
I. Introduction With the development of automobile industry, the problem of environmental pollution caused by automobile exhaust gas has become increasingly prominent. Platinum-based metals used in automotive exhaust gas purification catalysts are expensive and scarce in resources and should find new alternative catalysts. Since Libby proposed in 1971 that rare earth perovskite catalyst is expected to be used in the purification of automobile exhaust gas, various countries have carried out research successively, and the research scope extends to all kinds of rare earth composite oxides with high oxidation activity but serious SO 2 Poisoning problem. In this paper, SO 2 poisoning and regeneration of these catalysts were investigated. By comparison, we found a better catalyst against SO_2 poisoning and found a validated low temperature regeneration method to compensate for the lack of anti-virus. The better anti-virus catalyst to change the reaction conditions, investigated SO 2 poisoning, indicating that as long as the appropriate choice of conditions, the catalyst has great practical value.