氨催化氧化催化剂Pt/CeO_2的制备及性能表征  

Preparation and Application of Pt/CeO_2 Catalyst for Ammonia Oxidation Process

作　　者：蒲学令 张婷婷[1] 曾娅[1] 袁绍军[1] 蒋炜[1] 梁斌[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《化学反应工程与工艺》2016年第3期203-210,共8页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(21176157)

摘　　要：二氧化铈具有紫外光吸收能力,以其为载体,通过光催化还原沉积可实现贵金属负载。本研究通过光催化还原沉积制备了氨氧化用Pt/CeO_2催化剂,利用X射线衍射(XRD)、扫描电镜(SEM)、X射线能谱(EDS)、透射电镜(TEM)、BET比表面积、电耦合高频等离子发射光谱(ICP)、X射线光电子能谱(XPS)、NH_3-程序升温脱附(NH_3-TPD)对样品的物理性质进行了表征,并在φ4 mm×2 mm石英反应管中对其氨催化氧化性能进行了评价。结果表明,该法制备的Pt/CeO_2催化剂活性组分铂含量仅为0.079 7%,在载体表面分散性好;在反应温度800℃,原料中O_2和NH_3比为15的条件下,氨转化率为100%,氮氧化合物收率可达80%。Cerium dioxide is a photocatalyst with high ultra-violet light absorption capacity,which can be used as catalyst support to load noble metal by photo-reduction deposition process.In this research,Pt/CeO_2 composite catalyst for ammonia oxidation process was prepared by this method,and characterized with X-ray diffraction（XRD）,scanning electron microscopy（SEM）,X-ray energy spectrum（EDS）,transmission electron microscopy（TEM）,BET,inductive coupled plasma（1CP）,X-ray photoelectron spectroscopy（XPS）,and temperature programmed desorption（NH3-TPD）.The catalytic performance for ammonia oxidation reaction conducted in the φ4 mm×2 mm quartz reaction tube was also evaluated.The results showed that the content of active component Pt in the prepared Pt/CeO_2 catalyst was only 0.079 7% with high dispersion on the surface of ceria support.Ammonia conversion reached 100% with the yield of nitrogen oxides being as high as 80% at 800 ℃ when the molar ratio of oxygen to ammonia was 1：15.

关 键 词：二氧化铈 光催化还原 氨氧化 铂 

分 类 号：TQ032.41[化学工程] O643.3[理学—物理化学]