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    Comparing Pt/SrTiO3 to Rh/SrTiO3 for hydrogen photocatalytic production from ethanol

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    Type
    Article
    Authors
    Wahab, A. K.
    Odedairo, T.
    Labis, J.
    Hedhili, Mohamed N. cc
    Delavar, A.
    Idriss, H. cc
    KAUST Department
    Imaging and Characterization Core Lab
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Date
    2013-08-13
    Online Publication Date
    2013-08-13
    Print Publication Date
    2013-12
    Permanent link to this record
    http://hdl.handle.net/10754/550812
    
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    Abstract
    Photocatalytic hydrogen production from ethanol as an example of biofuel is studied over 0.5 wt% Rh/SrTiO3 and 0.5 wt% Pt/SrTiO3 perovskite materials. The rate of hydrogen production, rH2, over Pt/SrTiO3 is found to be far higher than that observed over Rh/SrTiO3 (4 × 10−6 mol of H2 g catal. −1 min−1 (1.1 × 10−6 mol of H2 m catal. −2 min−1) compared to 0.7 × 10−6 mol of H2 g catal. −1 min−1 (5.5 × 10−8 mol of H2 m catal. −2 min−1), respectively, under UV excitation with a flux equivalent to that from the sun light (ca. 1 mW cm−2). Analyses of the XPS Rh3d and XPS Pt4f indicate that Rh is mainly present in its ionic form (Rh3+) while Pt is mainly present in its metallic form (Pt0). A fraction of the non-metallic state of Rh in the catalyst persisted even after argon ion sputtering. The tendency of Rh to be oxidized compared to Pt might be the reason behind the lower activity of the former compared to the later. On the contrary, a larger amount of methane are formed on the Rh containing catalyst compared to that observed on the Pt containing catalyst due to the capacity of Rh to break the carbon–carbon bond of the organic compound.
    Citation
    Comparing Pt/SrTiO3 to Rh/SrTiO3 for hydrogen photocatalytic production from ethanol 2013, 3 (3-4):83 Applied Petrochemical Research
    Publisher
    Springer Nature
    Journal
    Applied Petrochemical Research
    DOI
    10.1007/s13203-013-0033-y
    Additional Links
    http://link.springer.com/10.1007/s13203-013-0033-y
    ae974a485f413a2113503eed53cd6c53
    10.1007/s13203-013-0033-y
    Scopus Count
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    Articles; Imaging and Characterization Core Lab

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