Role of CeO2 in Ni/CeO2–Al2O3 catalysts for carbon dioxide reforming of methane |
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Authors: | Shaobin Wang and G Q Lu |
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Affiliation: | Department of Chemical Engineering, The University of Queensland St. Lucia 4072, Qld Australia |
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Abstract: | Ni catalysts supported on γ-Al2O3, CeO2 and CeO2–Al2O3 systems were tested for catalytic CO2 reforming of methane into synthesis gas. Ni/CeO2–Al2O3 catalysts showed much better catalytic performance than either CeO2- or γ-Al2O3-supported Ni catalysts. CeO2 as a support for Ni catalysts produced a strong metal–support interaction (SMSI), which reduced the catalytic activity and carbon deposition. However, CeO2 had positive effect on catalytic activity, stability, and carbon suppression when used as a promoter in Ni/γ-Al2O3 catalysts for this reaction. A weight loading of 1–5 wt% CeO2 was found to be the optimum. Ni catalysts with CeO2 promoters reduced the chemical interaction between nickel and support, resulting in an increase in reducibility and stronger dispersion of nickel. The stability and less coking on CeO2-promoted catalysts are attributed to the oxidative properties of CeO2. |
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Keywords: | CeO2 Methane reforming CO2 Ni catalyst |
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