Improving the catalytic activity in dry reforming reaction by enhancing the oxygen storage capacity of Ce0.8Zr0.2O2 support through hydrogen heat-treatment

We provided a different atmosphere (20% H-2/N-2, N-2, and ambient air) during the heat-treatment of the Ce0.8Zr0.2O2 support while preparing a Ni/Ce0.8Zr0.2O2 catalyst. The difference in heat-treatment conditions affected the physicochemical properties of the support and catalyst. In particular, it strongly affected the oxygen storage capacity (OSC) of the Ce(0.8)Zr(0.2)O(2 )support. Ni (5 wt%) was impregnated on each Ce0.8Zr0.2O2 support heat-treated in different atmospheres, and the characterizations of each support and catalyst were also conducted. Interestingly, the dispersion of Ni-0 in the catalyst showed a similar trend to the OSC of the support because of the anchoring effect. The dispersion of Ni-0 mainly determined the catalytic activity of the dry reforming reaction in this study, not the OSC of the Ni impregnated catalyst. The characterization and catalytic reaction results revealed a deep relationship between the OSC of the support and the dispersion of Ni-0, crystallite size of Ni-0, and catalytic activity. The catalyst prepared with the support heat-treated in 20% H-2/N-2 showed the highest OSC of the support, highest Ni-0 dispersion and smallest Ni-0 crystallite size of the catalyst after impregnating Ni, resulting in the highest catalytic activity in the dry reforming reaction. This result suggests that the improvement of the catalytic activity by enhancing the OSC of the Ce0.8Zr0.2O2 support is possible through hydrogen heat-treatment before the impregnation of Ni.

Automated summary

This study investigates the effect of heat-treatment conditions on the physicochemical properties of the support and catalyst, and reveals the important relationship between the oxygen storage capacity of the support and the catalytic activity of the catalyst.