分别以γ-Al2O3、无定形硅铝和含少量稀土分子筛的γ-Al2O3为载体,制备了不同系列的NiW体系加氢脱硫催化剂,并在连续流动微反装置上评价了催化剂对4,6-二甲基二苯并噻吩(DMDBT)加氢脱硫反应的催化性能. 结果表明,NiW体系催化剂对该反应具有较高的芳烃加氢和脱硫活性; 先加氢后脱硫是加氢脱硫(HDS)反应的主要途径,提高加氢活性是提高HDS活性最有效的途径; 增强载体的酸性,直接脱硫和裂解活性均有所提高. 同时,酸性载体负载的催化剂还显示出一定的异构化性能,但其加氢活性低于氧化铝负载的催化剂. 酸性载体负载的NiW催化剂的异构化性能在邻二甲苯异构化反应中得到进一步证实. 根据实验结果,讨论了NiW体系催化剂上DMDBT转化反应的不同途径.
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