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Applied Catalysis A: General, Vol.582, 2019
Study on the modification of unsupported hydrodesulfurization catalysts by the ZSM-5 zeolite nanoclusters
The influence of ZSM-5 zeolite nanoclusters on the unsupported Ni-Mo catalyst was investigated by correlating their physicochemical properties with the hydrodesulfurization (HDS) activity of dibenzothiophene (DBT). The physicochemical properties of the catalysts before and after modification were characterized by N-2 adsorption-desorption, XRD, SEM, FT-IR, H-2-TPR, Py-IR, and HRTEM techniques. Results showed that the specific surface area and Lewis acid of the unsupported Ni-Mo catalyst were improved obviously after modification, which indicate that the ZSM-5 zeolite nanoclusters were successfully introduced into the unsupported Ni-Mo catalysts. Besides, DBT HDS results revealed that the catalysts Z5-NiMo-10 g and 25-NiMo-14h exhibited high hydrodesulfurization activity (the desulfurization rate of 98.1% and 100.0%, respectively). In particular, the catalyst 25-NiMo-10 g produced the highest isomerization rate of 68.9% due to more dispersed structure and suitable acidity.