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 Δ H 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 .