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Cooperative Catalysis of Methane Oxidation through Modulating the Stabilization of PdO and Electronic Properties over Ti-Doped Alumina-Supported Palladium Catalysts
journal contribution
posted on 2019-11-01, 19:13 authored by Benxia Chen, Jia Lin, Xiaohua Chen, Yelin Chen, Yalan Xu, Zhixiong Wang, Wen Zhang, Ying ZhengPoor low-temperature
catalytic activity and durability are the
main drawbacks of palladium-based catalysts for methane combustion.
Herein, stable and active PdO particles are constructed by incorporating
Ti into an alumina support, which makes the catalysts exhibit satisfactory
methane combustion activity. The results of comprehensive characterization
reveal that an appropriate amount of Ti doping induces the optimization
of electron transfer and distribution, thus contributing to the construction
and stabilization of active PdO lattices. The reactive oxygen mobility
is improved and the optimal PdO/Pd0 combination is achieved,
thanks to the amplified PdO–support interaction. In addition,
the acid–base properties are regulated and Brønsted acid
sites are generated by virtue of the adjustment of electronic properties,
which facilitate stabilization of PdO as well. Hence, the Ti-containing
catalyst exhibits superior activity for methane oxidation at low temperatures.
Notably, the activity and cyclic performance of the catalyst can be
further enhanced when undergoing long-term and isothermal heat treatment
under the reactant stream and methane, and it demonstrates a high
performance with 90% CH4 conversion at 340 °C.
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methane combustion activityheat treatmentmethane oxidationPdO particlesTi-Doped Alumina-Supported Palladium Catalysts PoorTi dopingelectron transferElectronic Propertiesreactant streamreactive oxygen mobilityCHpalladium-based catalystsPdO latticescyclic performanceCooperative Catalysisalumina supportTi-containing catalyst exhibitscatalysts exhibitBr ønsted acid sitesMethane Oxidationmethane combustion
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