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In situ simultaneous synchrotron powder diffraction and mass spectrometry study of methane anaerobic combustion on iron‐oxide‐based oxygen carrier
Author(s) -
Gemmi Mauro,
Merlini Marco,
Cornaro Ugo,
Ghisletti Danila,
Artioli Gilberto
Publication year - 2005
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889805004784
Subject(s) - powder diffraction , methane , rietveld refinement , analytical chemistry (journal) , synchrotron , mass spectrometry , combustion , chemistry , oxide , diffraction , in situ , iron oxide , oxygen , materials science , crystal structure , crystallography , physics , organic chemistry , chromatography , nuclear physics , optics
Reduction of iron oxide/CeO 2 solid due to methane anaerobic combustion has been studied using in situ time‐resolved synchrotron X‐ray powder diffraction and mass spectrometry measurements. All the chemical reactions involved in the process have been mapped. Rietveld profile fitting analysis has given a quantitative estimation of the different phases at every step of the reaction. The reaction temperature has been estimated using thermal expansion of both Fe 2 O 3 and CeO 2 . From the structural parameters of CeO 2 it has been possible to claim that CeO 2 participates in the reduction process by transforming into a reduced CeO x form. The number, x , of O atoms per formula unit has been estimated by measuring the percentage variation of the unit‐cell parameters.