Substituted metal oxides containing ionic species have been attracting a great deal of attention because of their potential ability to reduce the usage of precious metals in heterogeneous catalysts. We investigate Pd-substituted CeO2 for C-H bond activation reactions including the partial oxidation and dry reforming of CH4. This catalyst has been previously studied for CO oxidation, NOx reduction, and the water-gas shift reaction.  Pd-substituted CeO2, Ce1-xPdxO2-d, was prepared as a powder with high surface area and a hollow sphere morphology using ultrasonic spray pyrolysis.  The catalysts were extensively characterized using synchrotron x-ray diffraction and other techniques, confirming phase pure samples up to 10 mol% Pd substitution. Ce0.95Pd0.05O2-d was found to be active for partial oxidation of CH4 around 500�C and higher. Our studies, including post-catalytic synchrotron diffraction, suggest that the single-phase Ce1-xPdxO2-d material is not the active species and that catalysis occurs instead over the reduced two-phase Pd0/CeO2. This observation has been further confirmed by verifying the activity of the reduced Pd0/CeO2 catalysts for ethylene hydrogenation, a reaction that is known to require Pd0.

C-H bond activation by Pd-substituted CeO<sub>2</sub>: Substituted ions vs. reduced species

243rd National Meeting (2012)

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C-H bond activation by Pd-substituted CeO2: Substituted ions vs. reduced species

C-H bond activation by Pd-substituted CeO₂: Substituted ions vs. reduced species