Dynamical Properties of a Ru/MgAl2O4 Catalyst during Reduction and Dry Methane Reforming
Publication: Research - peer-review › Journal article – Annual report year: 2012
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Dynamical Properties of a Ru/MgAl2O4 Catalyst during Reduction and Dry Methane Reforming. / Kehres, Jan; Jakobsen, Jon Geest ; Andreasen, Jens Wenzel; Wagner, Jakob Birkedal; Liu, Haihua; Molenbroek, Alfons ; Sehested, Jens; Chorkendorff, Ib; Vegge, Tejs.
In: The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol. 116, 2012, p. 21407−21415.Publication: Research - peer-review › Journal article – Annual report year: 2012
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TY - JOUR
T1 - Dynamical Properties of a Ru/MgAl<sub>2</sub>O<sub>4</sub> Catalyst during Reduction and Dry Methane Reforming
A1 - Kehres,Jan
A1 - Jakobsen,Jon Geest
A1 - Andreasen,Jens Wenzel
A1 - Wagner,Jakob Birkedal
A1 - Liu,Haihua
A1 - Molenbroek,Alfons
A1 - Sehested,Jens
A1 - Chorkendorff,Ib
A1 - Vegge,Tejs
AU - Kehres,Jan
AU - Jakobsen,Jon Geest
AU - Andreasen,Jens Wenzel
AU - Wagner,Jakob Birkedal
AU - Liu,Haihua
AU - Molenbroek,Alfons
AU - Sehested,Jens
AU - Chorkendorff,Ib
AU - Vegge,Tejs
PB - American Chemical Society
PY - 2012
Y1 - 2012
N2 - Combined in situ small- and wide-angle X-ray scattering (SAXS/WAXS) studies were performed in a new laboratory setup to investigate the dynamical properties of a ruthenium/spinel (Ru/MgAl2O4) catalyst, w(Ru) = 4 wt %, during the reduction and subsequent dry methane reforming. The Ru particles in the fresh catalyst sample were found to be partially oxidized. High-resolution transmission electron microscopy (HRTEM) indicated a coexistence of pure Ru and RuO2 nanoparticles. Reduction in hydrogen occurred at a temperature between 373 and 393 K. The mean particle diameter as refined from SAXS of the size regime attributed to scattering from Ru/RuO2-particles decreases slightly by about 0.2 nm during the reduction. Dry methane reforming experiments were performed in a temperature interval from 723 to 1023 K by applying a gas mixture of carbon dioxide and methane in molar ratio of 3:1. The catalyst did not show any deactivation during the experiment of overall 32 h, indicated by stable turnover frequencies for methane. The mean Ru-particle diameter remained constant during the dry methane reforming experiments, revealing a high sintering stability of the Ru/MgAl2O4 catalyst.
AB - Combined in situ small- and wide-angle X-ray scattering (SAXS/WAXS) studies were performed in a new laboratory setup to investigate the dynamical properties of a ruthenium/spinel (Ru/MgAl2O4) catalyst, w(Ru) = 4 wt %, during the reduction and subsequent dry methane reforming. The Ru particles in the fresh catalyst sample were found to be partially oxidized. High-resolution transmission electron microscopy (HRTEM) indicated a coexistence of pure Ru and RuO2 nanoparticles. Reduction in hydrogen occurred at a temperature between 373 and 393 K. The mean particle diameter as refined from SAXS of the size regime attributed to scattering from Ru/RuO2-particles decreases slightly by about 0.2 nm during the reduction. Dry methane reforming experiments were performed in a temperature interval from 723 to 1023 K by applying a gas mixture of carbon dioxide and methane in molar ratio of 3:1. The catalyst did not show any deactivation during the experiment of overall 32 h, indicated by stable turnover frequencies for methane. The mean Ru-particle diameter remained constant during the dry methane reforming experiments, revealing a high sintering stability of the Ru/MgAl2O4 catalyst.
U2 - 10.1021/jp3069656
DO - 10.1021/jp3069656
JO - The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter
JF - The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter
SN - 1932-7447
VL - 116
SP - 21407−21415
ER -