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Acidity, Crystallite Size and Pore Structure as Key Factors Influencing 1,3,5-Trimethylbenzene Hydrodealkylation Performance of NiMoS/ZSM-5

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Abstract

NiMoS supported on ZSM-5 with different Si/Al ratio, crystallite size and pore structure was prepared by incipient impregnation method and applied in 1, 3, 5-trimethylbenzene (1, 3, 5-TMB) hydrodealkylation (HDAK). The physicochemical properties of samples were characterized by XRD, FTIR, SEM, N2 adsorption–desorption, NH3-TPD, Py-FTIR, H2-TPR, HRTEM and TGA. It is demonstrated that for microporous NiMoS/ZSM-5, acid amount and crystallite size of HZSM-5 are key factors affecting HDAK performance. The larger acid amount and smaller crystallite size can promote the conversion of 1, 3, 5-TMB, especially the dealkylation reaction, resulting in higher BTX yield. Compared to NiMoZ-3, mesopores in micro-mesoporous NiMoAKZ-3 are beneficial to accessibility of 1, 3, 5-TMB to NiMoS and acid sites in close proximity, and the diffusion of reactant and product molecules inside pores, thus resulting in superior HDAK performance of NiMoAKZ-3. Moreover, the reaction network of 1, 3, 5-TMB HDAK was revealed according to product distribution.

Graphic Abstract

NiMoS supported on ZSM-5 was developed for heavy aromatic hydrodealkylation (HDAK). Acid amount and crystallite size of microporous ZSM-5 are key factors affecting 1,3,5-trimethylbenzene (1,3,5-TMB) HDAK. Mesopores inside ZSM-5 facilitate accessibility of 1,3,5-TMB to NiMoS and acid sites in close proximity and improve HDAK performance.

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Manuscript including all data correct and unpublished.

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Acknowledgements

The authors would like to acknowledge the support provided by Natural Science Research Project of Guangdong University of Petrochemical Technology (2017rc02 and 2017qn25), Science and Technology Planning Project of Maoming (2018022 & 2019400), Young Innovative Talents Project of Guangdong Province (2018KQNCX158 & 2020KQNCX051), Open fund of Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province, Guangdong Basic and Applied Basic Research Fund (2020A1515110729, 2020A1515110552 & 2021A1515010278), the Training Program for Guangdong Provincial Characteristic Innovation Projects of Universities (2018KTSCX149), and the Project of PhDs’ Start-up Research of Guangdong University of Petrochemical Technology (2020bs002).

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Authors and Affiliations

  1. College of Chemical Engineering, Guangdong University of Petrochemical Technology, 139 Guandu Second Road, Maoming, 525000, People’s Republic of China

    Shufeng Shan, Yiting Tian, Feifei Chen, Shikui Wu, Rujin Zhou, Ying Xie, Ning Li, Xingye Zeng & Cunhui Lin

  2. Key Laboratory of Inferior Crude Oil Processing of Guangdong Provincial Higher Education Institutes, Guangdong University of Petrochemical Technology, 139 Guandu Second Road, Maoming, 525000, People’s Republic of China

    Shufeng Shan & Feifei Chen

  3. Chemical and Materials Engineering Department, University of Auckland, Level 8, 20 Symond Street, Auckland, 1010 CBD, New Zealand

    Wei Yu

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  1. Shufeng Shan
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Contributions

SS-conduct the experiment and write an original draft. YT-conduct the whole experiment. FC-writing, review, and editing. SW, RZ, YX, NL, XZ, CL-investigation. WY-review and editing.

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Correspondence to Feifei Chen.

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Shan, S., Tian, Y., Chen, F. et al. Acidity, Crystallite Size and Pore Structure as Key Factors Influencing 1,3,5-Trimethylbenzene Hydrodealkylation Performance of NiMoS/ZSM-5. Catal Surv Asia 26, 35–45 (2022). https://doi.org/10.1007/s10563-021-09344-6

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