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采用共沉淀法、溶胶-凝胶法和反相微乳液法制备了六铝酸盐催化剂LaCu0.8Zn0.2Al11O19-δ,进行了X射线衍射(XRD)和BET表征,并考察了它们对N2O催化分解反应的活性,研究了制备方法对催化剂LaCu0.8Zn0.2Al11O19-δ的结构、粒径、比表面积和催化分解N2O活性的影响。结果表明,3种方法制备的催化剂经1200℃焙烧4h后,都能形成六铝酸盐晶相,其中反相微乳液法制备的催化剂具有较小的粒径和较大的比表面积,其催化分解N2O的活性表现最佳,起始反应温度(T10%)为494℃,完全反应温度(T99%)为678℃。
The hexaaluminate catalyst LaCu0.8Zn0.2Al11O19-δ was prepared by coprecipitation method, sol-gel method and reverse microemulsion method. The catalysts were characterized by X-ray diffraction (XRD) and BET. Their catalytic activities for N2O catalysis The effects of preparation methods on the structure, particle size, specific surface area and catalytic decomposition of N2O of LaCu0.8Zn0.2Al11O19-δ catalyst were studied. The results show that the hexaaluminate crystal phase can be formed after the three catalysts are calcined at 1200 ℃ for 4h. The catalyst prepared by the reverse microemulsion method has a smaller particle size and a larger specific surface area. The activity of decomposing N2O was the best. The initial reaction temperature (T10%) was 494 ℃, and the complete reaction temperature (T99%) was 678 ℃.