改性氧化铝为载体的钯催化剂对甲烷催化氧化作用的研究

采用Mg、Mn、Ni、Zr、La、Ce等掺杂离子对氧化铝载体进行表面修饰，发现在改性载体表现形成的物相对添组分PdO的分散状态产生很大的影响，该效应并未通过改变可供分散表面的途径，而是采取了金属－载体相互作用的方式来实现的。变价金属杂质修饰的氧化铝载体表面形成的中间键型对甲烷燃烧反应没有助催作用，而在非变价金属Mg、Zr修饰的样品中的高温稳定的PdO物种，对反应产生了明显的助催效果，这种高温稳定的活性中间体是一种与PdO晶体具有相同的键合类型，具有特殊结构的PdO聚集体。

Total Oxidation of Methane over Palladium Catalyst Supported on Modified Alumina

We have investigated Pd supported on alumina surface modified by Mg, Mn, Ni, Zr, La, Ce for low temperature combustion of methane, and found that the surface modification prominently influenced over the dispersion status of PdO active phase in method of support-metal interaction. The intermediary chemical bond between impurity metal oxide with variable valence and alumina is of no avail to the promotion of catalytic combustion activity. For the doping of Mg and Zr induces the PdO aggregating on support surface into a special structure, which advantages the stabilization of oxidative species of active component, catalytic combustion reaction is obviously promoted thereby.