锆助剂含量对钴基费托合成催化剂的影响  

Effect of ZrO_2 Loadings on Catalytic Performance of Co/SiO_2 for F-T Synthesis

作　　者：陈建刚[1] 相宏伟[1] 王秀芝[1] 孙予罕[1] 刘涛[2] 胡天斗[2] 谢亚宁[2] 

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,太原030001 [2]中国科学院高能物理研究所

出　　处：《催化学报》2000年第4期359-362,共4页

基　　金：国家重点基础研究发展规划项目! (G1 9990 2 2 4 0 2 );北京正负电子对撞机国家实验室测试基金

摘　　要：考察了锆助剂含量对钴基催化剂的结构及费 托合成反应性能的影响 .结果表明 ,随着锆含量的增加 ,甲烷的生成受到抑制 ,重质烃选择性提高 ,重质烃合成的操作温度区间加宽 ,且催化剂仍保持较高的活性 .TPR ,H2 TPD ,XRD及EXAFS等表征结果表明 ,锆助剂单层分散于硅胶表面 ,而钴以一定尺寸的聚集态存在 ;随着锆含量的增加 ,锆覆盖的硅胶表面增加 ,裸露的硅胶表面减小 ,而钴的分散度几乎不变 .这使得钴锆界面增大 ,钴硅界面减小 ,有利于重质烃的生成 .另外 ,H2 TPD结果还表明 ,催化剂存在有从钴到锆硅载体的氢溢流 .The effect of ZrO 2 loadings on the structure and catalytic activity of Co based catalysts for F T synthesis was investigated. It was found that the addition of ZrO 2 enhanced the formation of heavy hydrocarbon and kept still high activity. The results of TPR, H 2 TPD, XRD and EXAFS indicated that ZrO 2 was dispersed in monolayer on SiO 2 while the Co species existed in certain agglomeration whose size was almost undisturbed by ZrO 2 loading. With the increase of ZrO 2 loading, the ZrO 2 covered silica surface increased whereas the Co dispersion kept fixed, resulting in a large Co ZrO 2 interface at the cost of Co SiO 2 interface. In thought of reactivity change, it might be concluded that the Co ZrO 2 interface favored the formation of heavy hydrocarbon. In addition, the hydrogen spillover from Co to ZrO 2/SiO 2 was evidenced by H 2 TPD.

关 键 词：锆助剂 钴基催化剂 费-托合成 液体燃料 

分 类 号：O643[理学—物理化学]