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Synthesis and Properties of Core–Shell Metal–Ceramic Microstructures and their Application as Heterogeneous Catalysts
Author(s) -
Kim Jieun,
Lee Doohwan
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402274
Subject(s) - catalysis , spinel , calcination , materials science , chemical engineering , ceramic , microstructure , hydrothermal circulation , dispersion (optics) , heterogeneous catalysis , shell (structure) , chemistry , composite material , metallurgy , organic chemistry , physics , optics , engineering
A facile synthesis of core–shell metal–ceramic microcomposites with unique structural and chemical properties and their superior performance as heterogeneous catalysts are reported. These core–shell microstructures were prepared by hydrothermal surface oxidation of Al particles in water with or without the presence of heterometal species followed by calcination. The crystalline porous MgAl 2 O 4 spinel, which has complex morphological features, allowed the superior dispersion and stability of Rh clusters, and the core–shell microarchitecture provided facilitated heat and mass transport concomitantly, which enabled a significant enhancement in the glycerol conversion turnover rate to hydrogen compared to the conventional Rh/MgAl 2 O 4 catalyst. This simple and scalable heterogeneous catalyst design approach offers practical applicability for catalytic reactions that require extensive heat and mass flux and rapid process response, such as for micro‐fuel‐processing in fuel cells.