Citation: ZHANG Hui-Min, HU Rui-Sheng, HU Jia-Nan, ZHANG Yu-Long. Preparation and Catalytic Activities of La2CoAlO6 for Methane Combustion[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1169-1175. doi: 10.3866/PKU.WHXB20110502
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A novel rare earth double perovskite-type catalyst (La2CoAlO6) was prepared by the sol-gel method using citric acid as complex agent. The catalyst was characterized by X-ray powder diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), specific surface area (BET), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and magnetic property measurement. This catalyst was evaluated for methane combustion. The results showed that a single-phase rare earth double perovskite oxide La2CoAlO6 could be formed by calcination at 1100 °C for 3 h. La2CoAlO6 gives od catalytic activity for methane combustion. It has a light-off temperature (T10) of 434.1 °C and a total conversion temperature (T90) of 657.4 °C. Compared with the single rare earth perovskite-type oxides LaCoO3 and LaAlO3, the T10 decreased by 56.5 and 138.2 °C, and T90 decreased by 84.6 and 108.9 °C, respectively. The FT-IR results indicate that all the synthesized oxides possess perovskite-type structures. Furthermore, the La2CoAlO6 samples showed excellent catalytic activity for methane combustion, which could be related to the decrease in reduction temperature that was observed in the H2-TPR experiments. This was probably because of the increased oxygen mobility that was promoted by the presence of aluminum. In addition, the rare earth double perovskite-type oxide La2CoAlO6 has a platelet morphology and is resistant to sintering. We also found that the double perovskite oxide La2CoAlO6 had special magnetic properties.
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