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Author: search.filters.author.Vitidsant, TharapongSubject: search.filters.subject.capsule catalyst

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    A Well-Defined Core–Shell-Structured Capsule Catalyst for Direct Conversion of CO2 into Liquefied Petroleum Gas
    (2020-04-21)
    Li, Hangjie
    ;
    Zhang, Peipei
    ;
    Guo, Lisheng
    ;
    He, Yingluo
    ;
    Zeng, Yan
    A Pd/SiO<inf>2</inf>@S1@H-ZSM-5 capsule catalyst (Pd/SiO<inf>2</inf>–SZ) is fabricated through a dual-layer crystal growth method with an auxiliary hydrothermal reaction. The catalyst exhibits excellent selectivity to liquefied petroleum gas (LPG) in CO<inf>2</inf> hydrogenation reactions, which is attributed to the tandem reactions of methanol synthesis on the Pd/SiO<inf>2</inf> core catalyst and methanol dehydration to hydrocarbons on the H-ZSM-5 shell. The Pd/SiO<inf>2</inf>–SZ capsule catalyst has a similar mesoporous structure, narrow range of Pd particles size distribution, and consistent reduction characteristics to the Pd/SiO<inf>2</inf> core catalyst. It maintains the physical and chemical properties of the core catalyst throughout the H-ZSM-5 shell synthesis process. Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy results reveal that the H-ZSM-5 zeolite shell completely encapsulates the Pd/SiO<inf>2</inf> core catalyst. Compared with the crushed capsule catalyst (Pd/SiO<inf>2</inf>–SZP), the well-defined-structured Pd/SiO<inf>2</inf>–SZ catalyst has a much higher LPG selectivity of 33.6 %, owing to the well-matched reactions at the Pd/SiO<inf>2</inf> core and H-ZSM-5 shell.