华东理工大学学报（自然科学版）2018，Vol.44Issue(1)：47-54,8.DOI:10.14135/j.cnki.1006-3080.20170304001
喷雾燃烧法制备Pt/TixCe(1-x)O2纳米颗粒及其CO催化氧化性能
Synthesis of Pt/TixCe(1-x)O2 Nanoparticles by Flame Spray Pyrolysis and Their Catalytic Activities for CO Oxidation
摘要
Abstract
As one of the typical heterogeneous catalysts,the supported noble metal materials (e.g.Pt,Au,Pd,etc.) with exceptional catalytic performance are widely used for catalytic applications.Besides control and design of the nanostructure,the synthesis approach is crucial for catalytic materials with outstanding chemical and physical properties.Today,most laboratory preparation even industrials manufacturing of catalysts is based on wet-phase techniques:co-precipitation,deposition-precipitation,colloid precipitation,incipient wetness impregnation and so on.Compared to conventional techniques,flame technology with scalable,continuous and well-established advantages is an effective method for the production of supported noble metal catalysts in large quantities and low cost.Especially,with versatile liquid precursors,flame spray pyrolysis (FSP) technique shows a considerable potential for one step and bottom-up synthesis of nanocatalysts with complex components and structure.Due to high flame temperature,the fast quenching rate,unique sintering and growth process in flame,strong metal-support interaction and high dispersion for loadings are realized.In this paper,a series of Pt/TixCe(1-x)O2 nanoparticles were prepared by flame spray pyrolysis using titanium isopropoxide,cerium 2-ethyl hexanoate and chloroplatinic acid dissolved in propionic acid as precursors.The influence of the amount of CeO2 on particles size,crystal form,the oxygen vacancy of surface and the catalytic activity for CO oxidation was systematically studied.Meanwhile,the growth mechanism of nanoparticles in the flame spray pyrolysis process was discussed.According to results,the cerium can incorporate into titania lattice and induce anatase TiO2 transform to rutile TiO2.The titanium-doped cubic CeO2-rich particles grow epitaxially on rutile TiO2 (101) lattice plane and elongate as islands.The Ce3+ increases the oxygen vacancies of particles surface and promotes the possibility of active oxygen to involve in CO catalytic oxidation.Pt/Ti0.9Ce0.1O2 exhibits the best CO catalytic oxidation performance and up to 100％ CO conversion at 70 ℃.关键词
喷雾燃烧/Pt/TiO2-CeO2/相转变/CO催化氧化Key words
flame spray pyrolysis/Pt/TiO2-CeO2/phase transformation/CO catalytic oxidation分类
化学化工引用本文复制引用
徐南,李云峰,于俊茹,江浩,胡彦杰,李春忠..喷雾燃烧法制备Pt/TixCe(1-x)O2纳米颗粒及其CO催化氧化性能[J].华东理工大学学报（自然科学版）,2018,44(1):47-54,8.基金项目
国家自然科学基金(91534122,21506125,91534202) （91534122,21506125,91534202）
上海市基础研究重点项目(14JC1490700,15JC1401300) （14JC1490700,15JC1401300）
