Catalytic combustion of methane over SnCuO catalysts

采用双股并流共沉淀法制备了SnCuO系列催化剂 ,测定了它们对甲烷燃烧反应的催化活性及抗硫中毒性能 ,并采用XRD ,BET ,XPS ,DTA TG和FT IR等技术对催化剂进行了表征 .比表面积和活性测试结果表明 ,SnCuO系列样品的比表面积均大于纯氧化物 ,其低温催化活性大大高于纯氧化物 .在Sn Cu原子数比接近 1时 ,其比表面积最大 (超过 10 0m2 g) .具有最大比表面积的样品SnCu4和SnCu5的活性最高 .进一步测定了SnCu4样品的抗硫中毒性能 .结果发现 ,在 5 0 0℃下 ,反应刚开始时甲烷的转化率为 98% ,随着SO2 的不断通入 ,催化剂的活性逐渐降...Catalytic combustion of methane is an effective way to utilize it as an energy source, or to prevent it from polluting the atmosphere. It was found that the binary metal oxides based on SnO2 displayed quite high activity for the deep oxidation of methane. The binary SnCuO catalysts were prepared by a modified co-precipitation method and characterized by XRD, BET, XPS, DTA-TG and FT-IR. The catalytic activity of the catalysts for methane combustion as well as their resistance to sulfur poisoning were investigated. The results showed that the surface areas of all SnCuO catalysts are bigger than pure SnO2 or CuO, especially for the samples with n(Sn)/n(Cu)approximate to1, their specific surface areas are bigger than 100 m(2)/g. The catalytic activity of the catalysts at low temperature is higher than pure SnO2 or CuO. SnCu4 and SnCu5 with the biggest specific surface area show the highest catalytic activity. For sample SnCu4, the resistance to sulfur poisoning, which is an important factor for the catalysts, was also investigated. SO2 was added into the source gas (phi(SO2)=0.02%) and the catalytic activity was measured at 500 degreesC. The CH4 conversion was 98% at the beginning, but decreased gradually and kept stable after 12 h with CH4 conversion of 50%. The mechanism of sulfur poisoning was further studied by FT-IR and DTA-TG methods and it was found that the deactivation of the catalysts under SO2 is due to transformation of CuO into CuSO4.SCI(E)中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)403229-2322