热分解法制备的Co/SiO_2催化剂上费-托合成反应性能  

Catalytic performances of Co/SiO_2 prepared through thermal decomposition for Fischer-Tropsch synthesis

作　　者：李泽壮[1,2] 陈建刚[1] 王月伦[1,2] 孙予罕[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,山西太原030001 [2]中国科学院研究生院,北京100049

出　　处：《燃料化学学报》2011年第1期54-58,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(20303026);国家重点基础研究发展规划(973计划;2005CB221402)

摘　　要：以无定形二氧化硅为载体,分别采用浸渍法和热分解法制备了钴基催化剂Co/A200-I和Co/A200-D,采用TG、XRD、TEM和TPR等手段对其进行了表征,并考察了这些催化剂在费-托合成反应中的性能。结果表明,浸渍法制备的Co/A200-I催化剂中钴颗粒没有规则的形状,但却具有较高的费-托合成反应活性;热分解法制备的Co/A200-D催化剂中钴颗粒呈一种球形二次结构,直径比较均匀,对于费-托合成反应具有较高的轻质烃选择性。此外,载体比表面积对催化剂结构也有较大的影响;相对于Co/A200-D催化剂,Co/A380-D催化剂的载体比表面积较大,这使得金属-载体间的相互作用较强而较难还原,但还原后Co/A380-D催化剂拥有较高的钴分散度和较好的反应活性。Cobalt based catalysts supported on amorphous SiO2 were prepared through thermal decomposition as well as incipient wetness impregnation.They were characterized by means of TG,XRD,TEM and TPR and used in Fischer-Tropsch（F-T） synthesis.The results indicated that Co/A200-I catalyst prepared by impregnation exhibits high F-T synthesis activity,though cobalt particles in it are in irregular shape.In comparison,the cobalt particles in Co/A200-D catalyst prepared through decomposition are in secondary spherical structure with relatively uniform diameter and the Co/A200-D catalyst exhibits high selectivity to light hydrocarbon in F-T synthesis.The specific surface area of SiO2 support also influences the structure of catalysts obtained.Compared with the Co/A200-D catalyst,Co/A380-D catalyst prepared by decomposition with higher surface area support is more difficult in reduction due to the stronger metal-support interaction;however,Co/A380-D exhibits higher catalytic activity in F-T synthesis,probably due to the higher cobalt dispersion.

关 键 词：热分解法 浸渍法 钴基催化剂 费-托合成 分散度 

分 类 号：O643.3[理学—物理化学]