反应温度对甲烷部分氧化Ni/SiC催化剂催化行为的影响  

Influences of Reaction Temperature on Catalytic Behaviors of Ni/SiC Catalyst for Partial Oxidation of Methane

作　　者：孙卫中[1] 武向阳[1] 靳国强[1] 郭向云[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《分子催化》2007年第3期200-204,共5页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金(20471067)

摘　　要：利用X射线衍射、热重分析、X射线光电子能谱、透射电镜等方法,考察了反应温度对甲烷部分氧化N i/S iC催化剂活性和积炭的影响.结果表明,在甲烷部分氧化过程中,反应温度不仅影响催化剂的活性,而且影响催化剂活性组分的存在形式、积炭量以及积炭的形貌.在500℃下,催化剂活性很低,表面N i物种十分复杂,催化剂积炭严重,主要为碳纳米管.但在850℃下,催化剂具有稳定的高活性,活性组分表面物种主要为金属N i,催化剂积炭量少,主要为壳状碳.Influences of reaction temperature on catalytic and coking behaviors of 10% Ni/SiC catalyst for partial oxidation of methane were investigated by X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy and transmission electron microscopy techniques. The results suggested that the reaction temperature influenced not only the catalyst activity, but also the surface species of the catalyst, coke content and morphology. The catalyst showed low activity at 500℃, and the surface Ni species existed as several different forms. The catalyst deactivation at the low temperature was mainly caused by coking, and the coke appeared in carbon nanotubes. At high temperature （850℃ ）, the catalyst exhibited stable and high activity and the surface Ni species was mainly metal Ni. The deposited carbon was very little and had a layered morphology.

关 键 词：甲烷部分氧化 Ni/SiC催化剂 积炭 

分 类 号：O543.32[理学—物理]