The morphology-performance relation is of great importance for designing a catalyst with high performance in the selective hydrodesulfurization (HDS) of fluid catalytic cracking (FCC) gasoline. Herein, we report a simple one-pot hydrothermal method to prepare the unsupported MoS₂ catalysts with controlled morphology by adjusting the pH values and using different precursors. It is found that smaller MoS₂ crystallites are produced when the pH value decreases in the synthetic process. With the increased MoS₂ crystallite size, the HDS selectivity factor (SF) increases from 1.46 to 1.52 for non-promoted MoS₂ catalysts, and from 13.96 to 19.69 for Co-promoted MoS₂ catalysts. On the other hand, for MoS₂ catalysts with similar stacking, the MoS₂ with longer slab length exhibits improved HDS selectivity (SF from 2.90 to 2.99). These results confirm that the slab length instead of the stacking for MoS₂ particles is more important to influence the HDS selectivity. Due to the fact that the corner sites could catalyze both HDS and HYD reactions while edge sites only catalyze the HDS reaction, thus increasing the edge/corner ratio by preparing (Co)MoS₂ catalysts with longer MoS₂ slab length is an efficient way to improve the selectivity in the selective HDS of FCC gasoline.

形态-性能关系对于设计在流化催化裂化（FCC）汽油的选择性加氢脱硫（HDS）中具有高性能的催化剂至关重要。在本文中，我们报告了一种简单的一锅法水热法，可通过调节pH值和使用不同的前体来制备形态可控的无载体MoS ₂催化剂。发现当在合成过程中pH值降低时，产生较小的MoS ₂晶体。随着增加的MoS ₂的微晶尺寸，HDS选择性因子（SF）从1.46增加到1.52非促进的MoS _2种催化剂，并从13.96到19.69为共同促进的MoS _2种催化剂。另一方面，对于MoS_在具有相似堆积的_2种催化剂中，具有更长板坯长度的MoS ₂表现出提高的HDS选择性（SF从2.90到2.99）。这些结果证实，平板长度而不是MoS ₂颗粒的堆积对于影响HDS选择性更为重要。由于以下事实：边角位点可以催化HDS和HYD反应，而边缘位点只能催化HDS反应，因此通过制备具有更长MoS ₂板坯长度的（Co）MoS ₂催化剂来增加边缘/角比是一种有效的方法提高了FCC汽油选择性HDS的选择性。