Catalytic properties of the proton conductor materials: Sr3CaZr0.5Ta1.5O8.75, BaCe0.9Y0.1O2.95 and Ba3Ca1.18Nb1.82O8.73 for reverse water gas shift

The proton conductors Sr3CaZr0.5Ta1.5O8.75 (SCZT), BaCe0.9Y0.1O2.95 (BCY10) and Ba3Ca1.18Nb1.82O8.73(BCN18) have been shown to be active heterogeneous catalysts for the reverse water gas shift (RWGS) reaction. Catalytic characterisation was conducted in a quartz fixed-bed reactor with a silica fritted disk and monitored by a gas chromatograph. X-ray diffraction and TGA + MS were used to characterise samples before and after catalytic tests. BCY10 reaches 45% CO2 conversion at 900 °C, 3% more than BCN18 (42% total conversion) at 900 °C. SCZT reaches 36% CO2 conversion at 900 °C, but has the lowest conversion onset temperature and activation energy of the materials studied.