Abstract
In this work, a series of palladium supported on the La0.8Sr0.2MnO3.15 perovskite catalysts (Pd/LSM-x) with different Pd loading were prepared by microwave irradiation processing plus incipient wetness impregnation method and characterized by XRD, TEM, H2-TPR and XPS. These catalysts were evaluated on the lean CH4 combustion. The results show that the Pd/LSM-x samples prepared by microwave irradiation processing possess relative higher surface areas than LSM catalyst. The addition of Pd to the LSM leads to the increase in the oxygen vacancy content and the enhancement in the mobility of lattice oxygen which play an important role on the methane combustion. The Pd/LSM-3 catalysts with 4.2wt% Pd loading exhibited the best performance for CH4 combustion that temperature for 10% and 90% of CH4 conversion is 315 and 520 °C.
Highlights
Natural gas (> 90% methane, CH4) is promising alternative sources for heat and energy production[1]
We had investigated the preparation of La-Mn-O perovskite catalyst by microwave irradiation method (MIM) and sol-gel method, and found that the La-Mn-O perovskite catalyst prepared by microwave method showed much better performance for methane combustion[37]
We investigated the preparation and characterization of La0.8Sr0.2MnO3.15 (LSM) perovskite catalyst by microwave irradiation method and its application used as support to obtained Pd/LSM catalysts by combining the incipient wetness impregnation and microwave irradiation method
Summary
Natural gas (> 90% methane, CH4) is promising alternative sources for heat and energy production[1]. Perovskite (ABO3) is a versatile catalyst which has been used in methane partial oxidation[10] This can be attributed to its unique crystalline structure, ion mobility, and thermal stability[10,11,12]. Palladium-based catalysts are currently recognized as the most active in the total combustion of methane and other hydrocarbons, and boast the largest use in the catalytic cleanup of emissions from stationary sources under lean-burn conditions at low temperatures[21,22]. The traditional methods e.g., sol-gel[31], citrate[32], solid-state reaction[33] and co-precipitation[34], involve in high-temperature and long time. This could damage to the environment and waste materials. The catalytic performances of the Pd/LSM catalysts and the role of Pd species were studied for methane combustion
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