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.
出处
《中国科学：化学》
CAS
CSCD
北大核心
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
