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Nanoporous and Highly Active Silicon Carbide Supported CeO 2 ‐Catalysts for the Methane Oxidation Reaction
Author(s) -
Hoffmann Claudia,
Biemelt Tim,
Lohe Martin R.,
Rümmeli Mark H.,
Kaskel Stefan
Publication year - 2014
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201300906
Subject(s) - materials science , catalysis , nanoporous , silicon carbide , chemical engineering , nanoparticle , pyrolysis , mesoporous material , sintering , methane , dispersity , porosity , nanotechnology , composite material , organic chemistry , polymer chemistry , chemistry , engineering
CeO x @SiO 2 nanoparticles are used for the first time for the generation of porous SiC materials with tailored pore diameter in the mesopore range containing encapsulated and catalytically active CeO 2 nanoparticles. The nanocasting approach with a preceramic polymer and subsequent pyrolysis is performed at 1300 °C, selective leaching of the siliceous part results in CeO x /SiC catalysts with remarkable characteristics like monodisperse, spherical pores and specific surface areas of up to 438 m 2 ·g −1 . Porous SiC materials are promising supports for high temperature applications. The catalysts show excellent activities in the oxidation of methane with onset temperatures of the reaction 270 K below the onset of the homogeneous reaction. The synthesis scheme using core‐shell particles is suited to functionalize silicon carbide with a high degree of stabilization of the active nanoparticles against sintering in the core of the template even at pyrolysis temperatures of 1300 °C rendering the novel synthesis principle as an attractive approach for a wide range of catalytic reactions.