摘要
采用水热法制备了锆掺杂的Ce0.8Zr0.2O2-δ复合氧化物。采用X射线衍射、激光Raman光谱、扫描电子显微镜、高分辨透射电子显微镜、X射线光电子能谱和H2程序升温还原等方法对样品进行了表征,并评价了其对CO氧化反应的催化性能。结果表明,以十六烷基三甲基溴化铵(CTAB)为形貌控制剂制得的棒状样品除了暴露稳定的(111)晶面,还优先暴露了活性较高的(220)晶面。而以柠檬酸(CA)为形貌控制剂制得的球状样品,只暴露稳定的(111)晶面。棒状样品表现出较好的低温还原性能及CO氧化活性,这可能与其暴露活性位较发育的(220)晶面和具有较高的Ce3+浓度及氧缺位浓度相关。
The Zr-doped Ce0.8Zr0.2O2-δ mixed oxide with different morphologies was synthesized by a hydrothermal method. The obtained samples were characterized by X-ray diffraction, laser Raman spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy, X-ray photoemission spectroscopy and H2 temperature-programmed reduction techniques, respectively. The catalytic performance of the samples for the CO oxidation was investigated. The results show that the microrod sample prepared with cetyltrimethylammonium bromide as a surfactant can expose the active planes of （220） besides the stable planes of （111）. However, the facets of （111） can be only exposed for the microsphere sample prepared with citric acid as a surfactant. The microrod sample has higher reducibility and activity in CO oxidation, which is likely due to the active planes of （220）, greater content of Ce3＋ and oxygen vacancies generated in the samples.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第7期897-903,共7页
Journal of The Chinese Ceramic Society
基金
浙江省科技计划项目(2014C37039)
关键词
复合氧化物
形貌
氧缺位
一氧化碳氧化
mixed oxides
morphology
oxygen vacancies
carbon monoxide oxidation
