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Hydroconversion of n-octane over different MoO3 phase modified nanosized HZSM-5 zeolites

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Abstract

The n-octane hydroconversion catalysts were prepared by the impregnation of nanosized HZSM-5 with ammonium heptamolybdate or phosphomolybdic acid (PMA) precursors and were characterised by SEM, BET, FT-IR, UV–Vis, XRD, Py-IR and NH3-TPD. The hydroconversion of n-octane over a little phosphorus doping on the n-octane hydroconversion activity of MoO3/ZSM-5 catalysts has been investigated in order to obtain light isomers, alkanes and aromatic products with high octane number. In particular, the use of PMA increases the ability of aromatization and producing light iso-alkanes for nanosized HZSM-5 zeolites. The yield of total aromatics and i/n ratio over PMA-based MoO3/ZSM-5 catalysts reached 31.7 and 3.3 after 10 h of continuous reaction, respectively. When 0.2 wt% of phosphorus is added to the catalyst prepared from heptamolybdate, the activity is suppressed. A mixture of monoclinic β-MoO3 and orthorhombic α-MoO3 favors increasing aromatization performance over nanosized HZSM-5 zeolites, and orthorhombic α-MoO3 is beneficial to the production of light iso-alkanes. It could be attributed to the difference between orthorhombic α-MoO3 and monoclinic β-MoO3 as well as the structural dissimilarity between the two phases on nanosized HZSM-5 zeolites. The improved activity of n-octane hydroconversion over these catalysts and the mechanism of hydroconversion is discussed.

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Acknowledgements

This project was supported by the Project of the Education Department of Liaoning Province (No. LJKMZ22021404 and LF2019002) and China Postdoctoral Science Foundation (No. 20080441109).

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Authors and Affiliations

  1. Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, 110629, People’s Republic of China

    Qingxin Xu, Chang Cai, Xinyao Wang, Nan Zhao & Lidong Chen

  2. School of Chemistry & Chemical Engineering, Dalian Univesity of Technology, Dalian, 116024, People’s Republic of China

    Xiangsheng Wang

  3. Public Technology Center, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences (CAS), Ningbo, 315201, People’s Republic of China

    Bingxue Zhang

  4. College of Chemistry and Chemical Engineering, Bohai University, Jinzhou, 121013, People’s Republic of China

    Dongmei Ren

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  1. Qingxin Xu
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Contributions

QX carried out data analysis and wrote the article. CC, XW and NZ carried out the experiment. LC, XW, BZ and DR designed the experiment and carried out data analysis. All authors read and approved the final manuscript.

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Correspondence to Lidong Chen.

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Xu, Q., Cai, C., Wang, X. et al. Hydroconversion of n-octane over different MoO3 phase modified nanosized HZSM-5 zeolites. Reac Kinet Mech Cat 137, 825–842 (2024). https://doi.org/10.1007/s11144-024-02582-5

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