Reduction of a Ni/Spinel Catalyst for Methane Reforming

Jan Kehres, Jens Wenzel Andreasen, Jostein Bø Fløystad, Haihua Liu, Alfons Molenbroek, Jon Geest Jakobsen, Ib Chorkendorff, Jane Hvolbæk Nielsen, Kristin Høydalsvik, Dag Werner Breiby, Tejs Vegge

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Abstract

A nickel/spinel (Ni/MgAl2O4) catalyst, w(Ni) = 22 wt%, was investigated in situ during reduction with wide angle X-ray scattering (WAXS) in a laboratory setup and with anomalous small angle X-ray scattering (ASAXS) at a synchrotron source. Complementary high resolution transmission electron microscopy (HRTEM) was performed on the fresh catalyst sample. The Ni particles in the fresh catalyst sample were observed to exhibit a Ni/NiO core/shell structure. A decrease of the Ni lattice parameter is observed during the reduction in a temperature interval from 413 – 453 K, which can be related to the reduction of the NiO shell, whereby stress due to the lattice mismatch of Ni and NiO is relieved.
Original languageEnglish
JournalThe Journal of Physical Chemistry Part C
Volume119
Issue number3
Pages (from-to)1424–1432
ISSN1932-7447
DOIs
Publication statusPublished - 2015

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