不同活性炭上Pt催化剂的分散性及其在甲基环己烷脱氢反应中的催化性能  

Dispersion of Pt Catalysts Supported on Activated Carbon and Their Catalytic Performance in Methylcyclohexane Dehydrogenation

作　　者：李晓芸[1] 马丁[1] 包信和[1] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室,辽宁大连116023

出　　处：《催化学报》2008年第3期259-263,共5页

基　　金：国家自然科学基金(90206036);国家重点基础研究发展计划(973计划;2005CB221405)

摘　　要：在不同方法处理的活性炭上采用传统浸渍方法制备了负载Pt催化剂,并考察了其在甲基环己烷脱氢反应中的催化性能.对炭载体的氮吸附和程序升温脱附的表征结果表明,活性炭经过硝酸氧化处理和氢气高温处理后,活性炭的孔结构基本不变,但表面含氧官能团的数量和种类发生了变化.这些不同的表面基团直接影响了Pt粒子在载体上的分散度,进而使催化剂在反应中表现出不同的活性.Activated carbon-supported method, and their catalytic activity for Pt catalysts were prepared by the conventional wetness impregnation methylcyclohexane dehydrogenation was tested. The impact of different treatments （nitric acid oxidation and H2 heating treatment） of carbon supports on the reaction performance was addressed. The results of nitrogen adsorption and temperature-programmed desorption show that the carbon supports have almost identical porous texture but different types and amounts of surface oxygen groups. This led to different dispersion of Pt particles and thus different activity and stability of the catalysts.

关 键 词：铂 活性炭 表面含氧基团 程序升温脱附 甲基环己烷 脱氢 

分 类 号：O643.32[理学—物理化学]