摘要
研究了 Pd- Ce- Ba催化剂活性和热稳定性。结果表明 ,该催化剂具有低温活性好、高效和热稳定性好的性能特点。对 CO、HC的起燃温度和半转化温度分别为 1 2 0℃、 1 60℃和1 40℃、 1 90℃ ,经原料气预处理或经原料气多次评价后的氧化反应结果明显优于催化剂未经受任何预处理的结果。稀土元素 Ce及碱土金属 Ba的氧化物在催化剂表面的富聚和在活性氧化铝涂层中的存在 ,对 Pd组分起到分散、隔离和稳定结构的作用 。
The catalytic activity and thermal durability of Pd Ce Ba catalyst were studied.On the catalyst,its ignition temperature for CO and hydrocarbons(HC)is 120℃ and 160℃,and its light off temperature is 140℃ and 190℃,respectively.Catalytic activity of the catalyst after being treated in feed gas or after times of evaluation tests was superior than that of untreated or fresh catalyst.The enrichment of rare earth element Ce and alkaline earth metal Ba on surface of the catalyst and their presence in active aluminium oxide coat promote dispersion,isolation and stabilization of palladium,thus ensure good thermal durability.
出处
《工业催化》
CAS
2001年第3期33-36,共4页
Industrial Catalysis
基金
山东省自然科学基金资助课题 !(Y97B0 80 31)
