Ni-CeO2, Ni-ZrO2 and Ni-Ce0.8Zr0.2O2 catalysts have been prepared by a co-precipitation method to develop catalysts suitable for synthesis gas production for gas to liquid (GTL) process. A conventional impregnation method was also employed to prepare Ni/CeO2, Ni/ZrO2 and Ni/Ce0.8Zr0.2O2 catalysts to compare the impregnated catalysts with the co-precipitated ones. Ni content was fixed at 15% for both cases. It has been confirmed that the co-precipitated Ni-CeO2 and Ni-Ce0.8Zr0.2O2 catalysts exhibited relatively high activity as well as stability, while the impregnated Ni/CeO2 and Ni/Ce0.8Zr0.2O2 catalysts slowly deactivated with time on stream at 800 °C. At the temperature range from 700 to 750 °C, co-precipitated Ni-Ce0.8Zr0.2O2 catalyst showed higher CH4 and CO2 conversion than Ni-CeO2 catalyst. The enhanced catalytic activity and stability of the co-precipitated Ni-Ce0.8Zr0.2O2 catalyst is due to the combination of nano-crystalline nature of cubic Ce0.8Zr0.2O2 support and finely dispersed nano-sized NiO crystallites resulting in intimate contact between Ni and support, better Ni dispersion, and enhanced oxygen transfer during the reaction.
Bibliographical noteFunding Information:
The authors would like to acknowledge the financial support of KEMCO and GTL Technology Development Consortium (Korea National Oil Corp., Daelim Industrial Co., Ltd., Doosan Mecatec Co., Ltd., Hyundai Engineering Co. Ltd. and SK Energy Co. Ltd.) under “Energy & Resources Technology Development Programs” of the Ministry of Knowledge Economy, Republic of Korea.
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