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Chatchai Veranitisagul,Nattamon Koonsaeng,Apirat Laobuthee,Navadol Laosiripojana 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
The ceria (CeO2) and gadolinia doped ceria (GDC; Ce1-xGdxO2-d with x = 0.10, 0.15, and 0.20) catalysts were successfully prepared via metal complex decomposition method at 900 8C for 2 h. The synthesized CeO2and GDC were found to have useful activity to convert ethane to syngas via the steam reforming reaction at the temperature range of 800–900 8C. The catalytic activity was improved with increasing Gd doping amount from 0 to 0.1 and 0.15; nevertheless, at higher Gd doping content (0.2), the improvement becomes less pronounced. Among all catalysts, Ce0.85Gd0.15O2-d showed the best steam reforming activity;furthermore, the amount of carbon formation over this catalyst was relatively low. These enhancements are mainly due to the high specific surface area and the good oxygen storage capacity (OSC) of the material. During the steam reforming process, the gas–solid reactions between the gaseous components presented in the system (C2H6, C2H4, and CH4) and the lattice oxygen (Ox) on the surface CeO2 or GDC occurs. The reactions of hydrocarbons adsorbed on the surface with Ox (CnHm + Ox! nCO + m/2(H2) + Ox-n) can prevent the formation of carbon species from hydrocarbons decomposition reaction (CnHm, nC + m/2H2). Moreover, the formation of carbon via Boudouard reaction (2CO , CO2 + C) is also reduced by the gas–solid reaction of CO with the lattice oxygen (CO + Ox, CO2 + Ox-1).
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