Abstract
The performance of the ZSM-5 zeolite catalysts modified by Au only, Mn only and both Au and Mn for catalytic cracking of light diesel were evaluated in this study. The gold-manganese modified catalyst showed better catalytic activity than the manganese-only or gold-only modified catalysts, as indicated by the improved propylene selectivity and micro-reaction activity index. It was found that small and uniform manganese nanoparticles with a mean diameter of 20 nm were homogeneously dispersed on ZSM-5 while uneven larger Au (> 100 nm) particles were deposited separately on the ZSM-5 surface. Significantly higher values of surface acidity were obtained for the Au–Mn/ZSM-5 catalysts compared to those for the Mn/ZSM-5 catalysts and ZSM-5 itself. With increasing manganese content, the acid strength and total acid content first increased and then decreased. The AuMn-modified ZSM-5 catalysts largely retain the crystal structure of ZSM-5 after a hydrothermal treatment, showing that the hydrothermal stability of the catalysts was enhanced and the loss of their surface acidity was reinforced by the double AuMn modification. Among all of the catalysts, 1%Au-3%Mn/ZSM-5 shows the best performance, since it maintains the intact structure and even narrower pore size distribution of the parent ZSM-5 zeolite as well as moderate acidity.
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Acknowledgements
We gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 21773202 and 21802117). We also appreciate for the financial support from the Key Research and Development Plan of Yantai (Grant: 2019LJRC140 and 2021XDHZ068).
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Su, H., Wu, L., Sun, X. et al. High Promoting of Catalytic Cracking of Light Diesel by Au–Mn Modified ZSM-5 for Propylene Production. Catal Lett 152, 2110–2118 (2022). https://doi.org/10.1007/s10562-021-03785-4
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DOI: https://doi.org/10.1007/s10562-021-03785-4