CO2 Reforming of CH4 over Ni／CeO2-ZrO2-Al203 Prepared by Hydrothermal Synthesis Method

The Ni/CeO2-ZrO2-A12O3 catalyst with different A12O3 and NiO contents were prepared by hydrothermal synthesis method. The catalytic performance for CO2 reforming of CH4 reaction, the interaction among components and the relation between Ni content and catalyst surface basicity were investigated. Results show that the interaction between NiO and A12O3 is stronger than that between NiO and CeO2-ZrO2. The addition of A12O3 can prevent the formation of large metallic Ni ensembles, increase the dispersion of Ni, and improve catalytic activity, but excess A12O3 causes the catalyst to deactivate easily. The interaction between NiO and CeO2 results in more facile reduction of surface CeO2. The existence of a small amount of metallic Ni can increase the number of basic sites. As metallic Ni may preferentially reside on the strong basic sites, increasing Ni content can weaken the catalyst basicity.

CO2 Reforming of CH4 over Ni/CeO2-ZrO2-Al2O3 Prepared by Hydrothermal Synthesis Method

The Ni/CeO2-ZrO2-Al2O3 catalyst with dierent Al2O3 and NiO contents were preparedby hydrothermal synthesis method. The catalytic performance for CO2 reforming of CH4 reaction, theinteraction among components and the relation between Ni content and catalyst surface basicity wereinvestigated. Results show that the interaction between NiO and Al2O3 is stronger than that between NiOand CeO2-ZrO2. The addition of Al2O3 can prevent the formation of large metallic Ni ensembles, increasethe dispersion of Ni, and improve catalytic activity, but excess Al2O3 causes the catalyst to deactivateeasily. The interaction between NiO and CeO2 results in more facile reduction of surface CeO2. Theexistence of a small amount of metallic Ni can increase the number of basic sites. As metallic Ni maypreferentially reside on the strong basic sites, increasing Ni content can weaken the catalyst basicity.