Effect of ZSM-5 Particle Size and Framework Silica-to-Alumina Ratio on Hexane Aromatization
Catalysis Research(2022)
Abstract
Parent ZSM-5 and Ga-modified ZSM-5 catalysts with different Si/Al ratios and particle sizes were prepared. The physicochemical properties of the prepared catalysts were investigated by performing X-ray powder diffraction analysis, BET surface area analysis, and NH3-TPD analysis. The performance of the aromatization reaction of the prepared catalysts was evaluated with 1-hexane as a model compound. The zeolite catalysts with a low SiO2/Al2O3 ratio possessed better activity than those with a high SiO2/Al2O3 ratio. Ga modification significantly improved the catalyst aromatization selectivity. Through aromatization, the acid sites of Ga-modified nano-sized zeolites promoted the selective conversion of produced olefin to aromatics by removing H-atoms. For the parent ZSM-5 and Ga-modified catalysts, the catalyst stability increased with an increase in the SiO2/Al2O3 molar ratio. The nano-sized ZSM-5 catalyst with a high SiO2/Al2O3 ratio exhibited better catalytic stability than the microscale ZSM-5, and the nano-sized catalyst with a low SiO2/Al2O3 ratio showed very low stability.
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Key words
hexane,silica-to-alumina
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