D. Wolf et al., KINETIC-STUDY OF THE WATER-GAS SHIFT REACTION AND ITS ROLE IN THE CONVERSION OF METHANE TO SYNGAS OVER A PT MGO CATALYST/, Catalysis today, 40(2-3), 1998, pp. 147-156
Transient as well as steady-state kinetic experiments were applied for
the derivation of the reaction mechanism and kinetic constants of the
water-gas shift reaction over a Pt/MgO catalyst. Separate investigati
ons on Pt-black and MgO were performed to elucidate the interaction of
the metal and support component in the catalytic process. The rate of
equilibration of the water-gas shift reaction was compared with the r
ates of methane conversion to syngas by steam reforming, CO2 reforming
and partial oxidation. Among these reactions the water-gas shift reac
tion is the fastest reaction step. CO2 and H2 adsorbed on MgO, OH-grou
ps on MgO as well as CO adsorbed on Pt should be the reactive surface
species. Hence, Pt as well as MgO play an important role in the cataly
tic process. While MgO provides sites for CO2 adsorption and H-2 activ
ation, the formation of stable Pt-CO adsorbates should be the driving
force of CO2 dissociation. (C) 1998 Elsevier Science B.V.