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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 1
BKCSDE 24(1)
January 20, 2003 

Stability of ZnAl2O4 Catalyst for Reverse-Water-Gas-Shift Reaction (RWGSR)
Oh-Shim Joo, Kwang-Deog Jung
RWGSR, Reducibility, Stability, Spinel
Reverse-Water-Gas-Shift reaction (RWGSR) was carried out over the ZnO, Al2O3, and ZnO/Al2O3 catalysts at the temperature range from 400 to 700 oC. The ZnO showed good specific reaction activity but this catalyst was deactivated. All the catalysts except the ZnO/Al2O3 catalyst (850 oC) showed low stability for the RWGSR and was deactivated at the reaction temperature of 600 oC. The ZnO/Al2O3 catalyst calcined at 850 oC was stable during 210 hrs under the reaction conditions of 600 oC and 150,000 GHSV, showing CO selectivity of 100% even at the pressure of 5 atm. The high stability of the ZnO/Al2O3 catalyst (850 oC) was attributed to the prevention of ZnO reduction by the formation of ZnAl2O4 spinel structure. The spinel structure of ZnAl2O4 phase in the ZnO/Al2O3 catalyst calcined at 850 oC was confirmed by XRD and electron diffraction.
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