Journal article
Dynamical Properties of a Ru/MgAl2O4 Catalyst during Reduction and Dry Methane Reforming
Center for Individual Nanoparticle Functionality, Department of Physics, and1
Nymøllevej 55, DK-2800 Kgs. Lyngby, Denmark2
Department of Energy Conversion and Storage3
Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics4
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.
| Language: | English |
|---|---|
| Publisher: | American Chemical Society |
| Year: | 2012 |
| Pages: | 21407-21415 |
| ISSN: | 19327455 and 19327447 |
| Types: | Journal article |
| DOI: | 10.1021/jp3069656 |
