A green route of isobutane-butene alkylation catalyzed by Y zeolite modified with synergistic F-containing solution

• Published in: Microporous and mesoporous materials Vol. 364; p. 112874
• Main Authors: Zhang, Chengxi, Lin, Meng, Zhou, Shunli, Li, Yongxiang, Shu, Xingtian
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 15.01.2024
• Subjects: Cage window; Diffusion performance; Isobutane-butene alkylation; Synergistic F-containing solution modification; Zeolite Y; Zeolite Y; Isobutane-butene alkylation; Cage window; Diffusion performance; Synergistic F-containing solution modification
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2023.112874

Fast deactivation is a long-standing problem for zeolite catalyzed isobutane-butene alkylation that hinders its massive industrialization, and the optimization of the zeolites' acidity and pore structure is the key problem. A synergistic F-containing solution modification method was proposed to improve the diffusion performance without damaging the zeolites’ acidity. The low-temperature ammonium fluoride treatment precise partly opened the cage windows of the zeolites to increase the acidity accessibility and diffusion performance. And the following acid treatment of ammonium fluosilicate effectively removed the extra-framework aluminum generated by the former treatment to achieve a high acidity and Brönsted acid amount to Lewis acid amount ratio. The best modified zeolite Y-11 has a lifetime of 60 h, which is 32% higher compared to that of the reference zeolite. Our primary results provide a promising strategy for designing superior zeolite catalysts for alkylation reactions. A synergistic F-containing solution modification method was proposed to improve the diffusion performance without damaging the zeolites' acidity, which have promoted the catalyst's alkylation stability. [Display omitted] •A synergistic F-containing solution modification method was proposed to improve the diffusion performance without damaging the acidity.•The ammonium fluoride treatment precise opened the cage windows of the zeolites to increase the acidity accessibility and diffusion.•The best modified zeolite Y-11 has a lifetime of 60 h, which is 32% higher compared to that of the reference zeolite.