CeF3分解制备CeO2／CeF3催化剂的丙烷氧化脱氢性能  

The Performance of Oxidative Dehydrogenation of Propane on CeO_2/CeF_3 Catalysts Prepared from CeF_3 Decomposition

作　　者：贾纬华 陈明树[1] 万惠霖[1] 

机构地区：[1]厦门大学化学化工学院、固体表面物理化学国家重点实验室、醇醚酯化工清洁生产国家工程实验室,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2014年第4期520-524,共5页Journal of Xiamen University：Natural Science

基　　金：国家重点基础研究发展计划(973)项目(2010CB732303,2013CB933102);国家自然科学基金(20923004,21033006,21073149,21273178);教育部重大研究计划(309019);教育部创新研究团队资助项目(IRT1036)

摘　　要：通过分解条件的控制从CeF3制备CeO2/CeF3催化剂.X-射线衍射(XRD)、Raman、低能离子散射谱(LEIS)对制备得到的催化剂进行表征和定量估算,发现CeO2覆盖在CeF3上,随着焙烧温度的升高,CeF3催化剂由外而内分解程度加大.CeF3制备的CeO2/CeF3催化剂的丙烷氧化脱氢(ODHP)性能显著优于CeO2,CeO2覆盖层厚度的增加导致表面F/O摩尔比下降,F-隔离活性位的作用减弱,丙烯选择性由56.3%降低到42.2%.在反应过程中,CeF3核为表面CeO2覆层源源不断地提供F-,进而使催化剂保持较好的ODHP反应性能和稳定性.A series of CeO2/CeF3 catalysts were prepared by the decomposition of CeF3 in air.Characterizations by XRD,Raman, and LEIS showed that CeO2 covered on the CeF3 surface.The degree of decomposition of CeF3 increased toward the interior with increasing calcined temperature.With the increase of the calcined temperature, the surface F/O molar ratio decreased due to the formation of a thicker layer of CeO2.The CeO2/CeF3 showed much better catalytic performance for the oxidative dehydrogenation of propane to propylene than CeO2 ,which may be due to that Fdiluted the surface active oxygen species and decreased the selectivity of propylene.

关 键 词：氧化脱氢 CeF3 CEO2 丙烷 丙烯 

分 类 号：O643[理学—物理化学]