HZSM-5-doped silica microsphere catalysts for methanol-to-olefins reaction: effect of HZSM5/SiO<sub>2</sub> ratio

DEĞİRMENCİOĞLU P., ARBAĞ H., OKTAR N.

RESEARCH ON CHEMICAL INTERMEDIATES, cilt.52, sa.4, ss.2519-2546, 2026 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 52 Sayı: 4
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1007/s11164-025-05907-8
  • Dergi Adı: RESEARCH ON CHEMICAL INTERMEDIATES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, Environment Index, Academic Search Ultimate (EBSCO), Natural Science Collection (ProQuest), Biological Science Database (ProQuest), Engineering Source (EBSCO), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
  • Sayfa Sayıları: ss.2519-2546
  • Gazi Üniversitesi Adresli: Evet

Özet

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/Br & oslash;nsted 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.