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A Well‐Defined Core–Shell‐Structured Capsule Catalyst for Direct Conversion of CO 2 into Liquefied Petroleum Gas
Author(s) -
Li Hangjie,
Zhang Peipei,
Guo Lisheng,
He Yingluo,
Zeng Yan,
Thongkam Montree,
Natakaranakul Jaru,
Kojima Tatsuki,
Reubroycharoen Prasert,
Vitidsant Tharapong,
Yang Guohui,
Tsubaki Noritatsu
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201903576
Subject(s) - catalysis , chemical engineering , fischer–tropsch process , selectivity , mesoporous material , x ray photoelectron spectroscopy , zeolite , chemistry , methanol , zsm 5 , materials science , organic chemistry , engineering
A Pd/SiO 2 @S1@H‐ZSM‐5 capsule catalyst (Pd/SiO 2 –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 2 hydrogenation reactions, which is attributed to the tandem reactions of methanol synthesis on the Pd/SiO 2 core catalyst and methanol dehydration to hydrocarbons on the H‐ZSM‐5 shell. The Pd/SiO 2 –SZ capsule catalyst has a similar mesoporous structure, narrow range of Pd particles size distribution, and consistent reduction characteristics to the Pd/SiO 2 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 2 core catalyst. Compared with the crushed capsule catalyst (Pd/SiO 2 –SZP), the well‐defined‐structured Pd/SiO 2 –SZ catalyst has a much higher LPG selectivity of 33.6 %, owing to the well‐matched reactions at the Pd/SiO 2 core and H‐ZSM‐5 shell.