C-H Bond Activation by Pd-substituted CeO2: Substituted Ions versus Reduced Species

Title
C-H Bond Activation by Pd-substituted CeO2: Substituted Ions versus Reduced Species
Author(s)
로렌 미쉬[로렌 미쉬]조쉬 쿠즈만[조쉬 쿠즈만]알란 더크[알란 더크]김영일람 세샤드리[람 세샤드리]호리아 메이투[호리아 메이투]에릭 맥팔랜드[에릭 맥팔랜드]갤런 스턱키[갤런 스턱키]
Keywords
OXYGEN STORAGE CAPACITY; GAS-SHIFT REACTION; METHANE COMBUSTION; CATALYTIC-ACTIVITY; NO REDUCTION; PALLADIUM CATALYSTS; CE1-XMXO2-DELTA M; NOBLE-METAL; HYDROCARBON OXIDATION; PEROVSKITE CATALYST
Issue Date
201112
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.23, no.24, pp.5432 - 5439
Abstract
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-delta, 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-delta was found to be active for partial oxidation of CH4 around 500 C and higher. including postcatalytic synchrotron diffraction, suggest that the single-phase Ce1-xPdxO2-delta material is not the active species and that catalysis occurs instead over the reduced two-phase Pd-0/CeO2. This observation has been further confirmed by verifying the activity of the reduced Pd-0/CeO2 catalysts for ethylene hydrogenation, a reaction that is known to require Pd.
URI
http://hdl.handle.net/YU.REPOSITORY/24164http://dx.doi.org/10.1021/cm202709y
ISSN
0897-4756
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이과대학 > 화학생화학부 > Articles
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