Abstract
The correlation between the occurrence state of surface Pd species of Pd/CeO2 for lean CH4 combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized a highly active 0.5% PdO/CeO2-RE catalyst, in which the Pd nanoparticles are evenly dispersed on the CeO2 nanorods CeO2-R. Based on comprehensive characterization, we have revealed that the uniformly dispersed Pd nanoparticles with a particle size distribution of 2.3 ± 0.6 nm are responsible for the generation of PdO and PdxCe1−xO2−δ phase with –Pd2+–O2−–Ce4+– linkage, which can easily provide oxygen vacancies and facilitate the transfer of reactive oxygen species between the CeO2-R and Pd species. As a consequence, the remarkable catalytic activity of 0.5% Pd/CeO2-RE is related to the high concentration of PdO species on the surface of the catalyst and the synergistic interaction between the Pd species and the CeO2 nanorod.
Highlights
Natural gas, which contains 85% methane, has an extensive range of applications because of its abundant reserves, environmental friendliness and safety [1,2,3]
We reveal that the excellent catalytic activity is associated with the proportion of surface PdO species, and closely bound to the oxygen vacancy and defect provided by
A series of Pd/CeO2 catalysts with different surface Pd species occurrence states had been rationally engineered for lean methane combustion
Summary
Natural gas, which contains 85% methane, has an extensive range of applications because of its abundant reserves, environmental friendliness and safety [1,2,3]. Natural gas as a vehicle fuel has the advantages of high calorific value, low exhaust pollution and cost-effectiveness. It has been popularized and applied all over the world. Catalytic oxidation is a typical gas-solid catalytic reaction. It has become one of the most effective means to abate low concentration methane by opting for an appropriate catalyst to reduce the activation energy of the reaction and make it a flameless reaction at a lower ignition temperature of 250–350 ◦ C [4]
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