不同载体负载的钴基费-托合成催化剂性能研究

Fischer-Tropsch Synthesis Performance of Co-Based Catalysts on Different Supports

考察了碳纳米管与传统氧化物作为载体负载的钴基催化剂用于费-托合成反应的性能.采用等体积浸渍法制备了钴基催化剂,并对催化剂进行了TPR、TEM、H2-化学吸附等表征分析.结果表明,Co/SiO2和Co/CNTs催化剂具有较低的还原温度且Co/SiO2催化剂还原峰较狭窄.TEM的结果显示Co/γ-Al2O3催化剂和Co/CNTs催化剂中的钴颗粒粒径分布范围较宽,而Co/SiO2催化剂的钴颗粒粒径分布较为均匀,这是导致其还原峰温范围不同的原因之一.费-托合成反应结果显示Co/CNTs催化剂和Co/γ-Al2O3催化剂具有比Co/SiO2催化剂更高的一氧化碳转化率,而Co/γ-Al2O3和Co/SiO2催化剂具有比Co/CNTs催化剂更高的C5+选择性和较高的α值.

Effect of support（carbon nanotubes and oxides）on catalytic performance of cobalt catalysts for Fischer-Tropsch synthesis（FTS）was investigated.The supported cobalt catalyst was prepared using incipient wetness impreg-nation method.Catalyst characterization techniques such as TPR,TEM and H2-chemisorption were also used.The TEM results show that both Co/SiO2 and Co/CNTs catalysts had lower reduction temperature than Co/γ-Al2O3 catalyst.The Co/SiO2 catalyst has narrow reduction temperature range due to its uniform Co particle size.Both Co/γ-Al2O3 and Co/CNTs catalysts have wider reduction temperature range due to the wider range of cobalt particle size distribution.The FTS reaction results suggest that both Co/CNTs and Co/γ-Al2O3 catalysts have higher CO conversion rate than Co/SiO2 catalyst,while Co/γ-Al2O3 and Co/SiO2 catalysts have higher selectivity C5＋ and α value than Co/CNTs catalyst.