Highly stable Fe/CeO(2) catalyst for the reverse water gas shift reaction in the presence of H(2)S

This study focused on evaluating the catalytic properties for the reverse water gas shift reaction (RWGS: CO(2) + H(2) → CO + H(2)O ΔH(0) = 42.1 kJ mol(−1)) in the presence of hydrogen sulfide (H(2)S) over a Fe/CeO(2) catalyst, commercial Cu–Zn catalyst for the WGS reaction (MDC-7), and Co–Mo catalyst for hydrocarbon desulfurization. The Fe/CeO(2) catalyst exhibited a relatively high catalytic activity to RWGS, compared to the commercial MDC-7 and Co–Mo catalysts. In addition, the Fe/CeO(2) catalyst showed stable performance in the RWGS environment that contained high concentrations of H(2)S. The role of co-feeding H(2)S was investigated over the Fe/CeO(2) catalyst by the temperature programmed reaction (TPR) of CO(2) and H(2) in the presence of H(2)S. The result of TPR indicated that the co-feeding H(2)S might enhance RWGS performance due to H(2)S acting as the hydrogen source to reduce CO(2).