A series of catalysts were prepared by using complex sol-gel methods.Experimental results confirm the effect of different agents on structure and activity of Fe-substituted rare earth hexaaluminate catalyst (LaFeAl11 O19 ) for methane combustion.The catalyst is yielded by complex sol-gel, respectively using three different complex agents (maltose, glucose and citric acid).XRD demonstrated that haxaaluminate is the major phase of catalyst prepared by maltose,while LaAlO3 is the major one of the catalyst by glucose and citric acid.At the same time, there is a little LaFeO3 and surface areas as well as 29.5 nm particle diameter when the complex agent is maltose.However, T10 ( temperature for 10% conversion of methane) and T100 ( temperature for 100% conversion of methane) for catalyst by glucose is 543 and 758 ℃, which is the best among the three complex agents for methane combustion.
用微乳法和异丙醇-聚乙二醇法制备了磁铅石型稀土高温燃烧催化剂L aM nA l11O19,并用XRD,BET和TPR技术及甲烷燃烧活性对其进行了表征,实验结果表明,微乳法和异丙醇-聚乙二醇法在1400℃的高温下焙烧3小时均可制备出主相结构为L aM nA l11O19的六铝酸盐催化剂,异丙醇-聚乙二醇法制备的L aM nA l11O19具有较高的比表面,微乳法制备的L aM nA l11O19具有较高甲烷催化燃烧活性。
