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<p>MoO<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> solid acid catalysts with MoO<sub>3</sub> loadings of 20, 50, and 80 mol% were synthesized via the impregnation method and extensively characterized using XRD, TG–DTA, N<sub>2</sub> adsorption–desorption, IR spectroscopy of adsorbed pyridine, and potentiometric titration. Increasing MoO<sub>3</sub> loading induced a clear structural evolution from highly dispersed Mo species to crystalline MoO<sub>3</sub> and Al<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> phases. Textural analyses revealed a progressive reduction in surface area and pore volume due to partial pore blockage by Mo-containing phases. Acidity measurements indicated a substantial increase in total acid site density and a distinct shift from Lewis-dominant to Brønsted-dominant acidity with higher MoO<sub>3</sub> content. Catalytic testing for isopropanol dehydration in the 260–400&#xa0;°C range showed that the MA-80 catalyst achieved complete (100%) conversion to propene at all tested temperatures and exhibited zero apparent activation energy, indicating exceptional catalytic efficiency. Lower-loaded catalysts required higher reaction temperatures to reach full conversion and displayed reduced activity. The superior performance of MA-80 was attributed to the predominance of Brønsted acid sites and enhanced acid strength, underscoring the pivotal role of MoO<sub>3</sub> loading in tuning surface acidity and optimizing catalytic performance for alcohol dehydration processes.</p>

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Catalytic dehydration of isopropanol to propene using MoO3/Al2O3 solid acid catalysts

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Hani Zeidan

摘要

MoO3/Al2O3 solid acid catalysts with MoO3 loadings of 20, 50, and 80 mol% were synthesized via the impregnation method and extensively characterized using XRD, TG–DTA, N2 adsorption–desorption, IR spectroscopy of adsorbed pyridine, and potentiometric titration. Increasing MoO3 loading induced a clear structural evolution from highly dispersed Mo species to crystalline MoO3 and Al2(MoO4)3 phases. Textural analyses revealed a progressive reduction in surface area and pore volume due to partial pore blockage by Mo-containing phases. Acidity measurements indicated a substantial increase in total acid site density and a distinct shift from Lewis-dominant to Brønsted-dominant acidity with higher MoO3 content. Catalytic testing for isopropanol dehydration in the 260–400 °C range showed that the MA-80 catalyst achieved complete (100%) conversion to propene at all tested temperatures and exhibited zero apparent activation energy, indicating exceptional catalytic efficiency. Lower-loaded catalysts required higher reaction temperatures to reach full conversion and displayed reduced activity. The superior performance of MA-80 was attributed to the predominance of Brønsted acid sites and enhanced acid strength, underscoring the pivotal role of MoO3 loading in tuning surface acidity and optimizing catalytic performance for alcohol dehydration processes.