In this research, a bimodal mesoporous AlMCM-41 (B-AM41) material was prepared and applied to support NiMo catalysts for the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene. Additionally, catalysts supported on smaller and larger single-pore AlMCM-41 (S-AM41 and L-AM41) were also prepared as reference catalysts. Detailed characterizations show that the proportion, stacking degree, and length of the MoS2 active phase on the different catalysts are distinct. As a result, HDS evaluation indicates that the NiMo/B-AM41 catalyst exhibited better catalytic activity with a reaction rate constant of 10.4 × 10−8 mol g−1 s−1 and a turnover frequency of 7.0 × 10−4 s−1, significantly surpassing the S-AM41 and L-AM41 supported catalysts. The superior activity of the NiMo/B-AM41 catalyst can be attributed to a high sulfidation degree that provides sufficient highly dispersed type Ⅱ MoS2 phases with minimal stacking and moderate slab length. Moreover, the bimodal mesoporous structure promotes the diffusion of 4,6-DMDBT and benefits its contact with active sites.

中文翻译：

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双峰介孔 AlMCM-41 负载型 NiMo 催化剂用于 4,6-二甲基二苯并噻吩的高效加氢脱硫


在本研究中，制备了一种双峰介孔 AlMCM-41 （B-AM41） 材料，并将其应用于 NiMo 催化剂，用于 4,6-二甲基二苯并噻吩加氢脱硫 （HDS）。此外，还制备了负载在较小和较大的单孔 AlMCM-41 （S-AM41 和 L-AM41） 上的催化剂作为参考催化剂。详细的表征表明，MoS2 活性相在不同催化剂上的比例、堆积程度和长度是不同的。结果，HDS 评估表明，NiMo/B-AM41 催化剂表现出更好的催化活性，反应速率常数为 10.4 × 10-8 mol g-1 s-1，周转频率为 7.0 × 10-4 s-1，明显优于 S-AM41 和 L-AM41 负载型催化剂。NiMo/B-AM41 催化剂的优异活性可归因于高硫化度，可提供足够的高度分散的 II. 型 MoS2 相，具有最小的堆积和适中的板坯长度。此外，双峰介孔结构促进了 4,6-DMDBT 的扩散，并有利于其与活性位点的接触。