稀土改性的氧化镍基低温乙烷氧化脱氢催化剂活性氧物种的Raman光谱研究

利用共沉淀法制备了几种稀土金属氧化物改性的氧化镍催化剂 ,考察了其乙烷氧化脱氢 (ODE)制乙烯的催化性能 ,讨论了不同稀土金属氧化物掺杂浓度对催化剂催化性能的影响 ,利用Raman光谱技术初步表征反应在该类催化剂上的活性氧物种为Raman谱带出现在 1 0 60cm- 1 的表面双原子超氧物种O-2 ,该谱峰的大小与催化剂的ODE性能有很好的对应关系。

Raman Spectroscopic Study of Active Oxygen Species for Oxidative Dehydrogenation of Ethane to Ethylene Over Rare Earth Metal Modified Nickel Oxide

Rare earth metal modified nickel oxides have been prepared by coprecipitation method, and which catalytic behaviour of oxidative dehydrogenation of ethane (ODE) to ethylene has been researched The results indicated that the catalytic behaviour of ODE have been apparent improved on the rare earth metal oxide modified nickel oxide catalysts With the Raman spectroscopy preliminary investigation, it has been found a good relation between the catalytic activity of the catalyst and the Raman band area of O - 2, which located at 1060cm -1 So it was proposed that the active oxygen species of ODE to ethylene reaction is the O - 2, which on the catalyst surface