水对SBA-15负载的钴基费-托合成催化剂催化性能的影响  

Effect of water on Fischer-Tropsch synthesis over SBA-15 supported cobalt catalysts

作　　者：赵燕熹[1] 张煜华[1] 韦良[1] 李金林[1] 

机构地区：[1]催化材料科学国家民委一教育部重点实验室,中南民族大学化学与材料科学学院,武汉430074

出　　处：《中国科学：化学》2014年第10期1627-1632,共6页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(21203253,21473259);湖北省重大科技创新计划(2013AGB002)资助

摘　　要：以SBA-15分子筛为载体,采用等体积浸渍法制备了负载量为20%的钴基催化剂,采用TEM、XRD、H2-TPR和N2物理吸附-脱附等方法对催化剂进行了表征,并在浆态床反应器中考察了水的加入对费-托合成反应性能的影响.结果表明,金属钴物种进入到SBA-15载体的孔道中;产物在孔道中的滞留以及水促进的金属钴物种的团聚,引起了催化剂活性的降低;水的加入有利于反应物和产物在孔道中的传输,增加CO的转化率;在SBA-15负载的钴基催化剂中,产物在孔道中的滞留对催化剂活性影响较大,引起的扩散限制是催化剂活性降低的重要原因.SBA-15 supported cobalt-based catalysts were prepared by incipient wetness impregnation method with a cobalt loading of 20%. The catalysts were characterized by TEM, XRD, temperature-programmed reduction, and N2adsorption-desorption techniques. The effect of the addition of water on the performance of catalysts in FTS was measured in a continuously stirred tank reactor. The results indicate that most of the Co3O4 nanoparticles were introduced into the SBA-15 channels. The CO conversion of 20% Co/SBA-15 increased upon the addition of water. The enhanced CO conversion by water addition was due to an improved diffusion effect of reactants and products in the pores.

关 键 词：费-托合成 水的影响 SBA-15 钴 

分 类 号：O643.36[理学—物理化学]