Dynamical Properties of a Ru/MgAl2O4 Catalyst during Reduction and Dry Methane Reforming

Jan Kehres, Jon Geest Jakobsen, Jens Wenzel Andreasen, Jakob Birkedal Wagner, Haihua Liu, Alfons Molenbroek, Jens Sehested, Ib Chorkendorff, Tejs Vegge

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume116
Pages (from-to)21407−21415
ISSN1932-7447
DOIs
Publication statusPublished - 2012

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