Comparison Between Ceria–Zirconia and Alumina as Supports for Oxidative Steam Reforming of Biodiesel
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The objective of the study is to illustrate the advantages with using ceria–zirconia instead of promoted alumina as support for rhodium-based catalysts in oxidative steam reforming of biodiesel. The evaluation is based on long-term oxidative steam reforming experiments where the stability and durability of the catalysts are evaluated. The durability and fuel conversion of the two catalysts were comparable. However, the H2 yield of the ceria–zirconia supported catalyst was 10 % higher than for the catalyst supported on promoted alumina after 65 h on stream. Included are also measurements of the acidity of the catalysts, where it was concluded that the promoted alumina catalyst was significantly more acidic. The acidity of the materials could then be related to the amount of coke deposited, where the amount of coke on the alumina catalyst was almost five times higher after 50 h of operation compared to the ceria–zirconia catalyst.
KeywordsOxidative steam reforming Biodiesel Ceria–zircona Alumina Acidity Coking
The Swedish Foundation for Strategic Environmental Research (Mistra) is gratefully acknowledged for their financial support. The financial support from KICInnoEnergy through the Project SynCon is also gratefully acknowledged. Thanks to MEL Chemicals for providing the CeO2–ZrO2 support, Corning Inc. for supplying the cordierite monoliths and Neste for supplying the NExBTL biodiesel. Thanks also to KIT for the help with the fuel vaporization system in the fuel reformer setup at KTH .
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