The action of nanosized Pt-containing Al 2 O 3 catalysts to avoid coking and sintering was studied in steam reforming of glycerol. The solids exhibited almost 100% conversion toward syngas produced at a suitable water to glycerol ratio. Depending on the promoter, a drastic drop in hydrogen yield was observed due to coking and sintering effects. Spent catalyst characterizations by Raman, HRTEM, XRD, TG and SEM-EDS as well as textural property techniques showed that coking, rather than sintering, was the main cause that determined the low hydrogen selectivity of nanosized Pt-containing Al 2 O 3 with La 2 O 3 or ZrO 2 . In contrast, coking did not cover the active sites of Pt-containing Al 2 O 3 with MgO or CeO 2 . Thus, steam suppressed carbon deposition and improved the nanosized Pt/MgO-Al 2 O 3 catalyst stability in the steam reforming of glycerol.
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