Glycerol reforming on Pt/C and PtMo/C catalysts was characterized with kinetic testing, operando X-ray absorption spectroscopy (XAS), and density functional theory (DFT).  Kinetic experiments indicate the addition of Mo increases hydrogen production rate, while decreasing selectivity, particularly at higher conversions.  Operando XAS indicates that the PtMo catalyst takes an energetically less preferred configuration, with a Mo rich surface and Pt rich core.  DFT calculations suggest that this is due to using MoOx as a precursor material, which prefers enrich the surface of bimetallic particles.  DFT also predicts a decrease in CO binding energy on PtMo bimetallic particles compared to Pt.  Operando XAS at the near edge demonstrate the presence of CO on the surface of the Pt/C catalyst, but not PtMo/C, due to the decrease in CO binding energy and increase in water gas shift rate (WGS).  WGS has been demonstrated as a potential probe reaction for glycerol reforming.

Kinetic and spectroscopic analysis of Pt based aqueous phase reforming catalysts

244th National Meeting (2012)

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