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
Type
ArticleAuthors
Al-Shareef, Reem A.
Harb, Moussab

Saih, Youssef
Ould-Chikh, Samy

Roldan, Manuel A.
Anjum, Dalaver H.

Guyonnet, Elodie Bile

Candy, Jean-Pierre
Jan, Deng-Yang
Abdo, Suheil F.
Aguilar-Tapia, Antonio
Proux, Olivier
Hazemann, Jean-Louis
Basset, Jean-Marie

KAUST Department
Chemical Science ProgramElectron Microscopy
Imaging and Characterization Core Lab
KAUST Catalysis Center (KCC)
Lab Consumables & Gases
Physical Science and Engineering (PSE) Division
Purchasing
Date
2018-04-25Online Publication Date
2018-04-25Print Publication Date
2018-07Permanent link to this record
http://hdl.handle.net/10754/627870
Metadata
Show full item recordAbstract
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 BVJournal
Journal of CatalysisAdditional Links
http://www.sciencedirect.com/science/article/pii/S0021951718301441ae974a485f413a2113503eed53cd6c53
10.1016/j.jcat.2018.04.009