Abstract
The steam reforming of propane and LPG has been investigated over Ru, Rh, Ir, Pt, Pd and Re catalysts (1 wt%) dispersed on commercial metal oxide supports (Al2O3, TiO2, CeO2-ZrO2). The Ru and Rh catalysts exhibit higher activity, which is comparable to that of a reference 10%Ni/Al2O3 sample. The performance of the Al2O3-supported Rh and 10%Ni catalysts deteriorates with time-on-stream due to the deposition of polymeric (Cβ) and/or vermicular (CV) carbon. The Ru-containing catalysts are considerably more stable because of the formation of small amounts of easily gasified carbon. Best results were obtained for the Ru/CeO2-ZrO2 catalyst, which is characterized by high activity, high selectivity toward H2 and excellent stability with time-on-stream. This has been attributed to the formation of, mainly, monoatomic carbon (Cα) species under reaction conditions, the high efficiency of Ru to gasify carbon deposits, and the presence of labile lattice oxygen species on the CeO2-ZrO2 support.
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