Journal
ACS CATALYSIS
Volume 7, Issue 3, Pages 1615-1625Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b03105
Keywords
catalytic combustion; methane; PdO; NiO; core-shell
Categories
Funding
- NSFC [21576298, 21425627]
- NSFC-SINOPEC Joint fund [U1663220]
- Science and Technology Plan Project [2013B090500029]
- NSF of Guangdong Province [2014A030313135, 2014A030308012]
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An alumina-supported core shell-structured NiO@PdO catalyst was prepared for lean CH4 combustion. NiO@PdO plays two roles in promoting the reaction. First, the enhanced NiO-PdO interfacial action accelerates the regular tetragonal PdO lattice construction, stabilizes the PdO particles, and suppresses the hydroxyl/water adsorption during the reaction. Second, the dispersion of shell PdO particles over core NiO improves PdO exposure and utilization efficiency. NiO@PdO/Al2O3 with a molar Ni/Pd ratio of 2/1 exhibits a (>)99% CH4 conversion and a good stability at 400 degrees C with a low 0.2 wt % Pd loading amount, which is among the best of the state-of-the-art Pd-based catalysts with respect to turnover frequency, Pd utilization efficiency, and Ni addition amount. Such interface promoted core shell-structured catalyst design strategy is inspiring for improving noble metal utilization efficiency in CH4 oxidation and other related reaction systems.
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