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Pd/SAPO-41 Bifunctional Catalysts with Enhanced Pd Dispersion Prepared by Ultrasonic-Assisted Impregnation: High Selectivity for n-Hexadecane Hydroisomerization

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Abstract

The preparation of bifunctional catalysts with high catalytic selectivity for the n-alkanes hydroisomerization still remains challenging for the production of bio-diesel. Herein, two series of Pd/SAPO-41 bifunctional catalysts are prepared by the ultrasonic-assisted impregnation (xPd/S41-U) with different treating time and conventional incipient wetness impregnation methods (0.30Pd/S41-I) on the SAPO-41 molecular sieve, respectively. The physico-chemical property of the synthesized SAPO-41 and prepared catalysts were studied by XRD, SEM, ICP, N2 physical adsorption, H2 chemisorption and Py-IR measurements. The catalytic performance for the n-hexadecane hydroisomerization over all catalysts is also studied. The characteristic results indicate that the xPd/S41-U catalysts show stronger Brønsted acidity compared with the 0.30Pd/S41-I catalyst. In addition, the Pd dispersion of the xPd/S41-U catalysts is almost two times higher than that of the 0.30Pd/S41-I catalyst, which leads more Pd cluster to enter into the micropores of the SAPO-41 molecular sieve. Furthermore, the 0.30Pd/S41-U catalyst with 0.30 wt % Pd loading shows promoted catalytic performance than that of the 0.30Pd/S41-I catalyst with the same Pd loading because of the stronger metal function and more favourable metal-acid balance caused by the larger CPd/CH+ ratio. Therefore, the ultrasonic-assisted impregnation prepared Pd/SAPO-41 catalysts are potential to be widely employed for the n-alkane hydroisomerization.

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ACKNOWLEDGMENTS

This work is supported by the National Natural Science Foundation of China (No.21676074, No.21706053), Intergovernmental International Science and Technology Innovation Cooperation Key Project (2018YFE0108800), National Ministry of Education “Silk Road 1+1” Research Cooperation Project, the Transformation for Science and Technology Achievements in University of Department of Education of Heilongjiang Province (TSTAU-C2018015) and Heilongjiang University graduate student innovation research project funding (YJSCX2019-175HLJU).

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Authors and Affiliations

  1. National Center for International Research on Catalytic Technology, Key Laboratory of Functional Inorganic Material Chemistry (Ministry of Education), School of Chemistry and Material Sciences, Heilongjiang University, Harbin, 150080, Heilongjiang, China

    Guozhi Jia, Wei Wang, Xuefeng Bai, Xiaomeng Wei, Xiaofang Su, Tong Li, Chunmu Guo & Wei Wu

  2. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia

    A. L. Maximov

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  1. Guozhi Jia
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Correspondence to Wei Wang or Wei Wu.

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Co-author A.L. Maksimov claims to be the editor-in-chief of the Journal of Applied Chemistry; the remaining co-authors have no conflict of interest.

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Jia, G., Maximov, A.L., Wang, W. et al. Pd/SAPO-41 Bifunctional Catalysts with Enhanced Pd Dispersion Prepared by Ultrasonic-Assisted Impregnation: High Selectivity for n-Hexadecane Hydroisomerization. Russ J Appl Chem 93, 502–511 (2020). https://doi.org/10.1134/S1070427220040047

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