摘要
采用还原法和沉积-沉淀法制备了介孔Au/NiO催化剂,并运用XRD、N2吸附-脱附、UV-Vis、FTIR、和XPS等方法对其进行了表征,考察了制备方法对Au/NiO催化剂物理化学性质和丙烷氧化脱氢制丙烯反应催化性能的影响.实验结果表明Au/NiO催化剂具有一定的低温催化活性,而还原法制备的催化剂催化性能好于沉积-沉淀法制备的催化剂,反应温度350℃时,还原法制备的Au/NiO催化剂的丙烷转化率和丙烯选择性分别达到25.1%和39.8%.制备方法对表面Au的价态分布、颗粒大小及分散度均有影响.催化剂表面Auδ+物种是催化剂的主要活性组分.
The Au/NiO catalysts were prepared by deposition-precipitation and chemical reduction methods and characterized by XRD, AAS, BET, UV-Vis, FTIR and XPS. The influence of preparation methods on their physi- cal and chemical properties, as well as on their catalytic behavior for the oxidative dehydrogenation of propane to propene reaction were investigated. The results show that the Au/NiO catalysts have certain catalytic activity at low temperature and the catalyst prepared by chemical reduction method has higher catalytic performance than the cata- lyst prepared by deposition-precipitation. 25.1% propane conversion and 39.8% propene selectivity were obtained over the catalyst prepared by chemical reduction method at 350℃. The preparation method affects the state distri- bution, particle size and dispersity of surface Au. The surface Auδ＋ species of the catalyst are regarded as the cata- lytic active component.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2013年第1期30-36,共7页
Journal of Molecular Catalysis(China)
基金
内蒙古自治区重大基础研究开放课题(2010KF02)
内蒙古自然科学基金博士基金(2010BS0806)
内蒙古自然科学基金(2012MS0219)
关键词
AU
NiO催化剂
光谱性质
丙烷
氧化脱氢
Au/NiO catalyst
spectral property
propane
oxidative dehydrogenation
