Effect of Type of Matrix on Formation of Aromatics by Cracking and Dehydrocyclization of <i>n</i>-Pentane Using ZnZSM-5 Metal Oxide Hierarchical Composite Catalysts

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  • ISHIHARA Atsushi
    Div. of Chemistry for Materials, Graduate School of Engineering, Mie University
  • MIZUNO Takuya
    Div. of Chemistry for Materials, Graduate School of Engineering, Mie University
  • HASHIMOTO Tadanori
    Div. of Chemistry for Materials, Graduate School of Engineering, Mie University

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  • ZnZSM-5–金属酸化物階層構造触媒を用いた<i>n</i>-ペンタンの分解および環化脱水素反応による芳香族生成に及ぼすマトリックスの影響
  • Effect of Type of Matrix on Formation of Aromatics by Cracking and Dehydrocyclization of n-Pentane Using ZnZSM-5 Metal Oxide Hierarchical Composite Catalysts

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<p>ZnZSM-5 metal oxide hierarchical composite catalysts were made using Zn-exchanged ZSM-5 and various oxides by the conventional kneading method. The effects of these oxides as matrices on the activity and selectivity for aromatics in cracking and dehydrocyclization of n-pentane were investigated. ZnZSM-5 50-85 wt% was mixed with oxide 0-35 wt% and alumina-sol binder 15 wt% using the kneading method. Al2O3 (A), TiO2 (T), ZrO2 (Zr) and kaolin (ka) were used as the oxide. Cracking and successive dehydrocyclization of n-pentane was carried out in a fixed-bed reactor under atmospheric H2 in the range 450-550 °C. Conversions of n-pentane at 550 °C decreased in the order ZnZSM/0A (85 wt% ZnZSM-5, 0 wt% Al2O3, 15 wt% binder) ≥ ZnZSM/10A > ZnZSM/10T > ZnZSM/10Zr > ZnZSM/10ka ≥ ZnZSM/35A. The selectivity for aromatics at 550 °C decreased in the order ZnZSM/10A > ZnZSM/0A > ZnZSM/10Zr = ZnZSM/10T = ZnZSM/10ka > ZnZSM/35A. These results suggested that the use of both ZnZSM-5 and matrix with large porosity for this reaction would optimize the catalytic functions. The product distribution indicated that aromatization of olefins to benzene, toluene, and xylene occurred through the Diels-Alder reaction on Zn species in the ZSM-5.</p>

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