Effect of Ce/Ti ratio on the catalytic activity and stability of Ni/CeO2-TiO2 catalyst for dry reforming of methane

In this study, a series of catalysts of composition Ni/X% CeO2-Y% TiO2, (where X and Y range from 0% to 100%), was prepared by impregnation. The effects of different ratio of CeO2/TiO2 on the catalytic activity and stability were examined during methane dry reforming. Ni/TiO2 showed better initial activity than Ni/CeO2. However, Ni/CeO2 was much more stable. The Ni/CeO2-TiO2 catalyst, which has optimum Ce/Ti ratio, showed excellent activity and stability in dry reforming. XPS analysis, H2 TPR, and a reverse water gas shift reaction (RWGS) test confirmed that higher dispersion of Ni sites on the surface of the support could improve the catalytic activity, and that great reducibility of catalyst could improve the stability of catalyst.