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    Understanding of the structure activity relationship of PtPd bimetallic catalysts prepared by surface organometallic chemistry and ion exchange during the reaction of iso-butane with hydrogen

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    Type
    Article
    Authors
    Al-Shareef, Reem A. cc
    Harb, Moussab cc
    Saih, Youssef
    Ould-Chikh, Samy cc
    Roldan, Manuel A.
    Anjum, Dalaver H. cc
    Guyonnet, Elodie Bile cc
    Candy, Jean-Pierre
    Jan, Deng-Yang
    Abdo, Suheil F.
    Aguilar-Tapia, Antonio
    Proux, Olivier
    Hazemann, Jean-Louis
    Basset, Jean-Marie cc
    KAUST Department
    Chemical Science Program
    Electron Microscopy
    Imaging and Characterization Core Lab
    KAUST Catalysis Center (KCC)
    Lab Consumables & Gases
    Physical Science and Engineering (PSE) Division
    Purchasing
    Date
    2018-04-25
    Online Publication Date
    2018-04-25
    Print Publication Date
    2018-07
    Permanent link to this record
    http://hdl.handle.net/10754/627870
    
    Metadata
    Show full item record
    Abstract
    Well-defined silica supported bimetallic catalysts Pt100-x Pdx were prepared by Surface Organometallic Chemistry (SOMC) and Ionic-Exchange (IE) methods. For all investigated catalysts, iso-butane reaction with hydrogen under differential conditions led to the formation of methane and propane, n-butane, and traces of iso-butylene. The total reaction rate decreased with increasing the Pd loading for both catalysts series as a result of decreasing turnover rate of both isomerization and hydrogenolysis. In the case of Pt100-x Pdx(SOMC) catalysts, the experimental results in combination with DFT calculations suggested a selective coverage of Pt (1 0 0) surface by agglomerated Pd atoms like “islands”, assuming that each metal roughly keeps its intrinsic catalytic properties with relatively small electron transfer from Pt to Pd in the case of Pt-rich sample and from Pd to Pt in the case of Pd-rich sample. For the PtPd catalysts prepared by IE, the catalytic behavior could be explained by the formation of a surface alloy between Pt and Pd in the case of Pd-rich sample and by the segregation of a small amount of Pd on the surface in the case of Pt-rich sample, as demonstrated by TEM, EXAFS and DFT. The catalytic results were explained by a structure activity relationship based on the proposed mechanism of CH bond and CC bond activation and cleavage for iso-butane hydrogenolysis, isomerization, cracking and dehydrogenation.
    Citation
    Al-Shareef R, Harb M, Saih Y, Ould-Chikh S, Roldan MA, et al. (2018) Understanding of the structure activity relationship of PtPd bimetallic catalysts prepared by surface organometallic chemistry and ion exchange during the reaction of iso-butane with hydrogen. Journal of Catalysis 363: 34–51. Available: http://dx.doi.org/10.1016/j.jcat.2018.04.009.
    Sponsors
    This work was supported by King Abdullah University of Science and technology and in part by UOP LLC, a Honeycomb Company, Des plaines, Illinois 60017, United States (contract 1088).
    Publisher
    Elsevier BV
    Journal
    Journal of Catalysis
    DOI
    10.1016/j.jcat.2018.04.009
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0021951718301441
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jcat.2018.04.009
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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