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A core–shell ni/SiO_(2)@TiO_(2) catalyst for highly selective one-step synthesis of 2-propylheptanol from n-pentanal

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Chinese Journal of Chemical Engineering 2022年第6期35卷 104-112页

作者： Hualiang An Rui Wang Wenhao Wang Daolai Sun Xinqiang Zhao Yanji Wang Hebei Provincial Key Laboratory of Green Chemical Technology and Efficient Energy Saving Tianjin Key Laboratory of Chemical Process SafetySchool of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China

One-step synthesis of 2-propylheptanol(2-PH)from n-pentanal via a reaction integration of n-pentanal self-condensation and successive hydrogenation is of great significance for it can simplify process flow and reduce energy consumption.The key to promotion of 2-PH selectivity is to enhance the competitiveness of n-pentanal self-condensation with respect to its direct hydrogenation.For this purpose,a core–shell structured ni/SiO_(2)@TiO_(2) catalyst was designed and prepared.With the precise architecture of this core–shell structured catalyst,n-pentanal can be firstly in contact with TiO_(2) to 2-propyl-2-heptenal(2-PHEA)while the direct hydrogenation to n-pentanol can be effectively inhibited,and then 2-PHEA diffuses into the core of ni/SiO_(2) and is hydrogenated to 2-PH.The spatial threshold of the core–shell catalyst significantly enhanced its catalytic performance;a 2-PH selectivity of 77.9%was reached with a 100%npentanal conversion.The 2-PH selectivity is much higher than that obtained by employing ni/TiO_(2) catalyst.Furthermore,the reaction kinetics of one-step synthesis of 2-PH from n-pentanal catalyzed by ni/SiO_(2)@TiO_(2) was studied and its kinetic model was established which is useful for reactor design and scale-up.

关键词： Reaction integration n-pentanal 2-Propylheptanol Core-shell structure Reaction kinetics

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