| SnO2is an n-type semi-conductor with surface deficient oxygen, which has the potential to be applied as catalytic meterials. Both CO and CH4are harmful gases to the atmosphere. Catalytic oxidation has been proven to be effective in preventing them from polluting the air. Supported Pt and Pd precious metal catalysts have been studied intensively over the last few decades and have been concluded to be the most active types of catalyst for the reactions. Owing to the special properties of both RuO2and SnO2, which enables them to form a stable soild solution with improved redox reversibility. SnO2catalysts modified by Ru have been studied extensively as electrodes for fuel cells, super capacitors and other materials. However, to the best of our knowledge, no work has been reported previously using SnO2catalysts modified by Ru as a catalyst for CO and CH4oxidation. In this paper, we have discussed the application of SnO2catalysts modified by Ru in CO and CH4oxidation.1.In the first part of this paper, RuO2supported on calcined and uncalcined SnO2were prepared by the impregnation method. The catalysts were evaluated for CO and CH4oxidation, and characterized by N2-BET, XRD, H2-TPR, EDS-SEM and TGA-DSC techniques to investigate the causes of activity differences. In addition, the catalysts are compared with Ru/Al2O3. It is noted here that Ru/SnO2catalysts are also very stable for the reactions, even in the presence of5%water vapour.2. In the second part of this paper, SnRu composit oxide catalysts with different Ru loadings were prepared by co-precipitation(CP), deposition-precipitation(DP), and impregnation (IMP) methods. The catalysts were evaluated for CO and CH4oxidation, as well as characterized by N2-BET, XRD, H2-TPR and XPS techniques to investigate the effect of preparation methods on the physicochemical properties of the catalysts. In contrast, Ru/Al2O3and Ru/SiO2with different Ru loadings were also prepared by impregnation method and studied with the same methods. |
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