Preparation of solid acid catalyst SO42-/TiO2/γ-Al2O3 for esterification: A study on catalytic reaction mechanism and kinetics

doi:10.1016/j.cjche.2018.11.021

摘要/Abstract

摘要： In this work, a series of SO₄^2-/TiO₂/γ-Al₂O₃ solid acid catalysts were synthesized by impregnation method, in which nano-TiO₂ was prepared by sol-gel method, and then the nano-TiO₂ sol was loaded on porous γ-Al₂O₃ supporter through impregnation. The structure and property of catalyst were characterized by XRD, N₂-BET, SEM, TEM, XPS, NH₃-TPD, Pyridine-IR and FT-IR. In addition, the catalyst of chelate bidentate coordination acid center model was established. The catalytic performance test was carried out in the esterification of n-butyl alcohol with lauric acid and the catalyst showed excellent activity. The experimental results showed that the medium strength acid sites were more dominant active sites than the strong and weak acid sites for the rapid esterification reaction. Its kinetic behaviors and activation energy were studied for the esterification under the catalytic reaction condition.

关键词: Solid acid catalyst, Nano-TiO₂, Esterification, Kinetics

Abstract: In this work, a series of SO₄^2-/TiO₂/γ-Al₂O₃ solid acid catalysts were synthesized by impregnation method, in which nano-TiO₂ was prepared by sol-gel method, and then the nano-TiO₂ sol was loaded on porous γ-Al₂O₃ supporter through impregnation. The structure and property of catalyst were characterized by XRD, N₂-BET, SEM, TEM, XPS, NH₃-TPD, Pyridine-IR and FT-IR. In addition, the catalyst of chelate bidentate coordination acid center model was established. The catalytic performance test was carried out in the esterification of n-butyl alcohol with lauric acid and the catalyst showed excellent activity. The experimental results showed that the medium strength acid sites were more dominant active sites than the strong and weak acid sites for the rapid esterification reaction. Its kinetic behaviors and activation energy were studied for the esterification under the catalytic reaction condition.

Key words: Solid acid catalyst, Nano-TiO₂, Esterification, Kinetics

Ying Yuan, Wenwei Jiang, Jinjin Li. Preparation of solid acid catalyst SO₄^2-/TiO₂/γ-Al₂O₃ for esterification: A study on catalytic reaction mechanism and kinetics[J]. 中国化学工程学报, 2019, 27(11): 2696-2704.

Ying Yuan, Wenwei Jiang, Jinjin Li. Preparation of solid acid catalyst SO₄^2-/TiO₂/γ-Al₂O₃ for esterification: A study on catalytic reaction mechanism and kinetics[J]. Chinese Journal of Chemical Engineering, 2019, 27(11): 2696-2704.

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Preparation of solid acid catalyst SO₄^2-/TiO₂/γ-Al₂O₃ for esterification: A study on catalytic reaction mechanism and kinetics

Preparation of solid acid catalyst SO₄^2-/TiO₂/γ-Al₂O₃ for esterification: A study on catalytic reaction mechanism and kinetics

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