Influence of grain size of acidic NiMo/TS-1 on its catalytic performance for hydrodesulfurization of dibenzothiophenes

Influence of grain size of acidic NiMo/TS-1 on its catalytic performance for hydrodesulfurization of dibenzothiophenes

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TS-1 zeolites with different grain sizes were prepared under hydrothermal conditions by tuning the amount of lochby venture pouch template agent, chelating agent, and temperature, which were further used as supports for the NiMo/TS-1 catalysts.The optimization of synthesis conditions has achieved controllable synthesis of grain sizes from nano-scale to micron-scale.TS-1 with smaller grain sizes possess larger specific surface area, external specific surface area, and pore volume, which can effectively shorten the diffusion path of the sulfide with complex structure.Nano-scale TS-1 has more highly-coordinated Ti species, acting as electronic additives to increase the sulfidation degree of the catalyst.

Nano-scale NiMo/TS-1 exhibits higher acidity, which is beneficial for hydrodesulfurization (HDS) reactions.Among the series of NiMo/TS-1 catalysts, NiMo/TS-1 cga 200 to cga 510 adapter (120 nm) catalyst exhibits the highest dibenzothiophene (DBT, 88.4 %) and 4,6-dimethylbenzothiophene (4,6-DMDBT, 62.1 %) HDS activities.