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Reverse-Water-Gas-Shift reaction (RWGSR) was carried out over the ZnO, Al 2 O 3 , and ZnO/Al 2 O 3 catalysts at the temperature range from 400 to 700 °C. The ZnO showed good specific reaction activity but this catalyst was deactivated. All the catalysts except the ZnO/Al 2 O 3 catalyst (850 °C) showed low stability for the RWGSR and was deactivated at the reaction temperature of 600 °C. The ZnO/Al 2 O 3 catalyst calcined at 850 °C was stable during 210 hrs under the reaction conditions of 600 °C and 150,000 GHSV, showing CO selectivity of 100% even at the pressure of 5 atm. The high stability of the ZnO/Al 2 O 3 catalyst (850 °C) was attributed to the prevention of ZnO reduction by the formation of ZnAl 2 O 4 spinel structure. The spinel structure of ZnAl 2 O 4 phase in the ZnO/Al 2 O 3 catalyst calcined at 850 °C was confirmed by XRD and electron diffraction.

Stability of ZnAl2O4Catalyst for Reverse-Water-Gas-Shift Reaction (RWGSR)

Stability of ZnAl₂O₄Catalyst for Reverse-Water-Gas-Shift Reaction (RWGSR)