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Citation: Yi RU, Tao MENG, Zhaoteng XUE, Dongsen MAO. Synergistic catalysis of Al distribution and pore structure in ZSM-5 zeolite for bioethanol-to-propylene[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(2): 247-262. doi: 10.11862/CJIC.20250255 shu

Synergistic catalysis of Al distribution and pore structure in ZSM-5 zeolite for bioethanol-to-propylene

  • Faculty of Chemical Engineering and Energy Technology, Shanghai Institute of Technology, Shanghai 201418, China

Figures(14)

  • Magnesium (Mg) was successfully incorporated into the ZSM-5 zeolite framework via hydrothermal synthesis, and its effects on pore structure, acidity, framework aluminum (AlF) distribution, and catalytic performance in bioethanol-to-propylene (ETP) conversion were systematically investigated. It was demonstrated that the mesopore volume was significantly enhanced while the crystallinity was slightly reduced with increasing Mg content. By temperature programmed desorption (NH3-TPD) and pyridine infrared (Py-IR) analyses, it was revealed that the total acid amount and strong acid strength were effectively decreased by Mg incorporation, while the Brønsted-to-Lewis acid ratio was increased. Through solid-state nuclear magnetic resonance (27Al MAS NMR) and UV-visible diffuse reflectance spectra (UV-Vis DRS) characterizations, it was indicated that the migration of AlF from channel intersections to sinusoidal or straight channels was promoted by Mg, and the formation of aluminum pairs (Alpair) was reduced. In the ETP reaction, the 2-MgHZ5 catalyst with moderate Mg modification demonstrated superior performance, exhibiting an enhanced propylene selectivity (29.5%) compared to the unmodified ZSM-5(HZ5) (26.8%), along with a twofold extension in the time during which the propylene selectivity was maintained at no less than 10% (30 vs 15 h for HZ5). This improved catalytic performance was attributed to its moderate acid strength, well-developed mesoporous structure, and optimized aluminum distribution, through which aromatization and coke formation were collectively suppressed while the olefin-cyclopentadiene cycle pathway was promoted.
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