XRD data I Metcalfe B Ray E Papaioannou D Mak C De Leeuwe 10.17634/080913-1 https://data.ncl.ac.uk/articles/dataset/XRD_data/10280900 Processed data used in figures, unprocessed exhaust gas data and XRD data. 2018-01-01 00:00:00 XRD Oxygen partial pressure Oxygen content Conversion Mole fraction Carbon dioxide Carbon monoxide Water Hydrogen Perovskite OCM Reverse flow Chemical looping Water-gas shift