A novel catalyst, Ni/Ce-ZrO2, exhibits very high catalytic activity and sta
bility even in the stoichiometric steam reforming of methane (H2O/CH4 = 1).
Furthermore, when it was employed in oxy-steam reforming, it gave enhanced
CH4 conversion (99.1%) at 750 degreesC and the activity was maintained for
100 h. The high catalyst stability is mainly ascribed to the synergistic e
ffect of the Ce modifier resulting from high capacity to store oxygen and h
igh ability to produce mobile oxygen.