钴基费-托合成催化剂上CO、H_2的吸附行为  

H_2 or CO Chemsorption on Co-based Catalysts for F-T Synthesis

作　　者：陈建刚[1] 相宏伟[1] 董庆年[1] 王秀芝[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学所煤转化国家重点实验室,太原030001

出　　处：《物理化学学报》2001年第2期161-164,共4页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划资助项目! (G199022402)&&

摘　　要：采用程序升温脱附及 FT-IR技术考察了 CO、 H2在钴基催化剂上的吸附行为 .H2-TPD表明 ,Co/SiO2催化剂有两类脱附氢 ,引入锆助剂后 ,低温脱附氢量明显增加 ,高温吸附氢量下降 .CO-TPD及吸附态 CO的红外光谱表明锆助剂使 CO在钴催化剂上的吸附强度减弱 ,但其吸附量增大 .钴基催化剂的费-托合成反应性能可以用吸附态物种的变化来解释 .Both Co/SiO2 and Co/ZrO2/SiO2 catalysts for F-T synthesis were characterized by temperature programmed desorption (TPD) and FT-IR spectra. H-2-TPD evidenced that there were two H-2 desorption peaks over Co/SiO2 catalyst and that the amount of H-2 adsorption decreased upon introduction of ZrO2. CO-TPD and CO-IR showed that addition of ZrO2 weakened the intensity of CO adsorption but increased the amount of adsorbed CO. In F-T synthesis, ZrO2 promoter enhanced the formation of heavy hydrocarbons in addition to keeping high activity. Such a shift of product array to heavier hydrocarbon was related to the increase of surface H-2/CO ratio.

关 键 词：费-托合成 钴基催化剂 锆助剂 表面吸附物种 红外光谱 一氧化碳 氢气 

分 类 号：O647[理学—物理化学] O643.3[理学—化学]