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<p>The methanol-to-olefins (MTO) process provides a promising non-oil-based route for light olefin production, but conventional HZSM-5 catalysts suffer from coke deposition and rapid deactivation. In this study, HZSM-5 was incorporated into silica microspheres (MS) via a novel microencapsulation strategy specifically designed to enable simultaneous tuning of acidity and porosity, addressing limitations of traditional catalyst modification methods. Catalysts with varying HZSM-5/SiO<sub>2</sub> weight ratios (0, 0.1, 0.25, 0.5) were synthesized and characterized using XRD, BET, DRIFTS, SEM, TEM, TGA, FTIR, and ICP-OES. Among them, 0.25HZSM-MS exhibited a balanced micro-mesoporous structure together with moderate Lewis/Brønsted acidity, achieving 85.6% methanol conversion&#xa0;with 48.7% light olefin selectivity. Remarkably, coke formation was reduced by 77% compared with parent HZSM-5, and activity was maintained over eight regeneration cycles. These findings highlight, for the first time, that this microencapsulation-based control of HZSM-5 dispersion within silica microspheres represents a distinct methodological advance, enabling synergistic tuning of acidity and porosity and offering a durable and selective catalyst for MTO applications.</p>

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HZSM-5-doped silica microsphere catalysts for methanol-to-olefins reaction: effect of HZSM5/SiO2 ratio

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月12日

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  • Pinar Degirmencioglu,
  • Huseyin Arbag,
  • Nuray Oktar

摘要

The methanol-to-olefins (MTO) process provides a promising non-oil-based route for light olefin production, but conventional HZSM-5 catalysts suffer from coke deposition and rapid deactivation. In this study, HZSM-5 was incorporated into silica microspheres (MS) via a novel microencapsulation strategy specifically designed to enable simultaneous tuning of acidity and porosity, addressing limitations of traditional catalyst modification methods. Catalysts with varying HZSM-5/SiO2 weight ratios (0, 0.1, 0.25, 0.5) were synthesized and characterized using XRD, BET, DRIFTS, SEM, TEM, TGA, FTIR, and ICP-OES. Among them, 0.25HZSM-MS exhibited a balanced micro-mesoporous structure together with moderate Lewis/Brønsted acidity, achieving 85.6% methanol conversion with 48.7% light olefin selectivity. Remarkably, coke formation was reduced by 77% compared with parent HZSM-5, and activity was maintained over eight regeneration cycles. These findings highlight, for the first time, that this microencapsulation-based control of HZSM-5 dispersion within silica microspheres represents a distinct methodological advance, enabling synergistic tuning of acidity and porosity and offering a durable and selective catalyst for MTO applications.