文献类型：期刊文献

中文题名：喷雾燃烧法制备Pt/Ti_xCe_((1-x))O_2纳米颗粒及其CO催化氧化性能

英文题名：Synthesis of Pt/Ti_xCe_((1-x))O_2 Nanoparticles by Flame Spray Pyrolysis and Their Catalytic Activities for CO Oxidation

作者：徐南[1];李云峰[1];于俊茹[1];江浩[1];胡彦杰[1];李春忠[1]

机构：[1]华东理工大学材料科学与工程学院超细材料制备与应用教育部重点实验室,上海200237

年份：2018

卷号：44

期号：1

起止页码：47

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(91534122;21506125;91534202);上海市基础研究重点项目(14JC1490700;15JC1401300)

语种：中文

中文关键词：喷雾燃烧;Pt/TiO2-CeO2;相转变;CO催化氧化

外文关键词：flame spray pyrolysis; Pt/TiOz-CeO2 ; phase transformation; CO catalytic oxidation

摘要：采用喷雾燃烧法,以钛酸四异丙酯、2-乙基己酸铈和氯铂酸为前驱体,丙酸为溶剂,制备Pt/Ti_xCe_((1-x))O_2系列纳米复合颗粒。系统研究了催化剂助剂CeO_2添加量对产物的粒径、晶型、表面氧空位和CO催化氧化活性的影响规律,探讨了喷雾燃烧过程中纳米颗粒的生长机理。结果表明:Ce离子能够进入TiO_2晶格,并促进TiO_2由锐钛矿相向金红石相的转变;富集存在的CeO_2会沿着TiO_2金红石晶面外延生长为月牙岛状。Ce^(3+)能够增加颗粒表面的氧空位,提升载体活性氧参与CO氧化反应的可能性。Pt/Ti_(0.9)Ce_(0.1)O_2表现出最高的CO催化氧化活性,在70℃时CO转化率达到100%。
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/Ti2Ce（1-x）O 2 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 Ce02 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 TiOz transform to rutile TiOz. The titanium-doped cubic Ce0 2-rich particles grow epitaxially on rutile TiOz （101） lattice plane and elongate as islands. The Ce^3＋ increases the oxygen vacancies of particles surface and promotes the possibility of active oxygen to involve in CO catalytic oxidation. Pt/Ti0.9 Ce0.! 02 exhibits the best CO catalytic oxidation performance and up to 100 % CO conversion at 70 ℃ .