活性炭材料对镍基催化剂乙醇气相羰化性能的影响  

Influences of Different Active Carbons on the Catalytic Performance of Ni/C Catalysts for Vapor-Phase Carbonylation of Ethanol

作　　者：章青[1] 王会芳[1] 孙果宋 黄科林 方维平[1] 杨意泉[1] 

机构地区：[1]厦门大学化学化工学院,福建厦门361005 [2]广西化工研究院,广西南宁530001

出　　处：《催化学报》2009年第6期555-559,共5页

基　　金：国家重点基础研究发展计划(973计划,2004CB217805);院校重点合作项目(0042-K81009)

摘　　要：采用浸渍法制备了负载在竹炭(BC)、柱状煤质炭(CYC)、果壳炭(FC)、木质炭(WC)和椰壳炭(CC)上的5种Ni基催化剂,考察了镍分散度、还原性能及催化乙醇气相羰化制丙酸的性能.用N2物理吸附法、X射线光电子能谱和程序升温脱附等方法研究了活性炭的孔结构特性、表面含氧官能团种类和数量.结果表明,Ni/CC的羰化活性最高,乙醇转化率和丙酸选择性分别为96.1%和93.2%,而Ni/BC的羰化活性最低,乙醇转化率和丙酸选择性分别为63.0%和32.7%.催化剂催化羰化性能与其载体活性炭材料的性质密切相关.Different active carbons, i.e. bamboo charcoal, cylindrical coal, fruit carbon, wood charcoal, and coconut charcoal, were used to prepare Ni/C catalysts for vapor-phase carbonylation of ethanol. The results revealed that the Ni/CC catalyst showed the highest catalytic activity for ethanol carbonylation with 96.1% of ethanol conversion and 93.2% of propionic acid selectivity, but the Ni/BC catalyst showed the lowest activity with 63.0% of ethanol conversion and 32.7% of propionic acid selectivity. The Ni/C catalysts were characterized by CO adsorption and temperature-programmed reduction. Meanwhile, N2 physical adsorption, X-ray photoelectron spectroscopy, and temperature-programmed desorption were used to investigate the structural properties, the species and quantities of surface oxygen functional groups of active carbons. It was found that the catalytic performance of the Ni/C catalysts depended on the nature of active carbons greatly.

关 键 词：活性炭 乙醇 气相羰化 丙酸 表面官能团 

分 类 号：O643.36[理学—物理化学]