SrTiO_3体系上甲烷氧化偶联催化性能及XPS表征  

Catalytic Properties for Oxidative Coupling of Methane andXPS Characterization on the SrTiO_3 Catalysts

作　　者：黄媛玉[1] 缪建文[2] 

机构地区：[1]南通农业职业技术学院,江苏南通226007 [2]南通大学化学化工学院,江苏南通226007

出　　处：《化工时刊》2005年第11期13-16,共4页Chemical Industry Times

摘　　要：用X-光电子能谱(XPS)研究SrTiO2体系上不同Sr/Ti比、B位不同价态掺杂元素和掺杂量的催化剂组成、表面吸附氧含量与甲烷氧化偶联(OCM)催化性能。结果表明Sr/Ti比增加、B位掺杂元素(Zr,Al,Mg)价态降低和B位Mg2+掺杂量增加会导致催化剂表面吸附氧含量的增加,并与催化剂的C2产物选择性有顺变关系,但表面吸附氧含量过高会导致甲烷的深度氧化。The composition and surface adsorbed oxygen concentration and catalytic properties for oxidative coupling of methane （OCM） of SrTiO3 catalysts, on which there are different Sr/Ti ratio,valence state and content of the cation doped, studied by X- ray photoelectron spectroscopy （XPS） method. Increasing Sr/Ti ratio and doping the cations of lower valence （e. g. Mg ^2＋ , Al^3＋ , Zr^4＋ ） in the B site of SrTiO3 and increasing the amount of Mg2 ~ cation doped may result in the higher adsorbed oxygen concentration on the catalysts surface and thus higher C2 selectivity for OCM. However, the over high content of the adsorbed oxygen species on the surface results

关 键 词：甲烷氧化偶联 SrTiO3催化剂 光电子能谱 表面吸附氧 

分 类 号：O643.32[理学—物理化学]