Unsupported catalysts have attracted much attention for high activity in comparison with the traditional supported catalyst. Meanwhile, the clear structure of unsupported catalysts is helpful for the recognition of active phase for conducting the industry production. The NiMoW unsupported catalyst was prepared by hydrothermal synthesis and characterized by BET, XRD and HRTEM. The effects of naphthalene, quinoline and H2S on the hydrodesulfurization reactivity of dibenzothiophene (DBT) were investigated in both a batch autoclave and a continuous 10 ml fixed bed micro-reactor over NiMoW and supported catalyst for comparison. The results showed that the hydrogenation reaction and the hydrogenolysis reaction occurred on different active sites. For supported catalyst, the inhibition was relatively weaker, and the inhibition of the hydrodesulfurization pathway was much higher than the direct desulfurization pathway. Although unsupported catalyst was very sensitive to quinoline and H2S in this experiment, the HDS ratio on the unsupported catalyst was maintained at a high level above 99.7%, which is attributed to the very high active site density of unsupported catalysts.

中文翻译：

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萘喹啉和H2S对无载体NiMoW催化剂上DBT加氢脱硫的影响

与传统的负载型催化剂相比，非负载型催化剂因其高活性而备受关注。同时，无载体催化剂的清晰结构有助于识别活性相进行工业生产。NiMoW无载体催化剂通过水热合成制备，并通过BET、XRD和HRTEM表征。萘、喹啉和 H2S 对二苯并噻吩 (DBT) 加氢脱硫反应性的影响在间歇高压釜和连续 10 ml 固定床微反应器中通过 NiMoW 和负载型催化剂进行研究，以进行比较。结果表明，加氢反应和氢解反应发生在不同的活性位点上。对于负载型催化剂，抑制作用相对较弱，加氢脱硫途径的抑制作用远高于直接脱硫途径。尽管在本实验中无载体催化剂对喹啉和 H2S 非常敏感，但无载体催化剂上的 HDS 比率保持在 99.7% 以上的高水平，这归因于无载体催化剂非常高的活性中心密度。