caa a22 4500 606174222 CHVBK 20210128100737.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11244-015-0378-9 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0378-9 Synthesis and Properties of Al2O3Al Metal-Ceramic Core-Shell Microstructures for Catalyst Applications [Elektronische Daten] [Jieun Kim, Doohwan Lee] Core-shell Al2O3@Al microstructures consisting of a highly heat conductive Al metal core encapsulated by a dense γ-Al2O3 shell formed by aggregation of porous γ-Al2O3 crystallites were obtained by hydrothermal surface oxidation of Al metal particles using two different methods: hydrothermal reactions at elevated temperatures above 423K under autogenous pressure and microwave-powered surface-activated hydrothermal reactions at atmospheric pressure. The phase transformation of Al into γ-Al2O3 at the core/shell interface and the resulting morphological and structural properties of γ-Al2O3 crystallites from these two synthesis routes differed significantly. The high temperature hydrothermal route led to formation of densely agglomerated plate and rhombic shaped γ-Al2O3 crystallites with properties attributed to temperature, pH, and the presence of anions (NO3 −, Cl−, SO4 2−) and metal cations (Na+, K+, Ca2+). The microwave-powered method was highly efficient for structure formation under benign temperature and pressure conditions, resulting in uniform core-shell microstructures with unique petal-like surface morphologies and a sharp pore size distribution. These core-shell structured Al2O3@Al metal-ceramic composites utilized as supports for Rh catalysts enabled facilitated heat transport for endothermic glycerol steam reforming reactions, which resulted in substantial rate enhancements compared to a conventional Rh/Al2O3 catalyst. Springer Science+Business Media New York, 2015 Core-shell catalyst nationallicence Metal-ceramic composite nationallicence Aluminum oxidation nationallicence Alumina microstructures nationallicence Glycerol reforming nationallicence Kim Jieun Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering, University of Seoul, Siripdae-gil 13, Jeonnong-dong, 130-743, Seoul, Republic of Korea aut Lee Doohwan Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering, University of Seoul, Siripdae-gil 13, Jeonnong-dong, 130-743, Seoul, Republic of Korea aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/4-6(2015-04-01), 375-385 1022-5528 58:4-6<375 2015 58 11244 https://doi.org/10.1007/s11244-015-0378-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0378-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Jieun Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering, University of Seoul, Siripdae-gil 13, Jeonnong-dong, 130-743, Seoul, Republic of Korea aut NATIONALLICENCE 700 1- Lee Doohwan Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering, University of Seoul, Siripdae-gil 13, Jeonnong-dong, 130-743, Seoul, Republic of Korea aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/4-6(2015-04-01), 375-385 1022-5528 58:4-6<375 2015 58 11244