采用SEM,XRD,EDS及N2吸附-脱附方法研究了骨架型MoOx-SiO2催化剂和负载型MoOx/SiO2催化剂的物理化学结构,并在常压固定床流动反应器上考察了两种催化剂对正庚烷异构化反应的催化性能. 结果表明,在MoOx-SiO2催化剂中,44.6%的SiO2即可起到很好的骨架支撑作用; MoOx晶相以足够大的空间区域聚集包裹在SiO2骨架中,形成类似MoOx催化剂的独特的中孔结构. 与MoOx催化剂相比,MoOx-SiO2催化剂显著提高了机械强度,并维持了MoOx催化剂较高的活性和选择性. 由于钼物种和载体之间的相互作用,负载型MoOx/SiO2催化剂表现出较低的比活性. 脉冲注入H2S实验结果表明,MoOx-SiO2催化剂具有较好的抗硫性能.
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