Wu Peng Hu Ruisheng Long Zerong Meng He (College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China)
<正> 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 (LaFeAl11O19) 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 LaFeAl11O19 contained in the catalysts made by maltose and citric acid. The catalysts has about 17.04 m2 ·g-1 specific 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.
hexaaluminate; sol-gel; methane combustion; complex agent; rare earths
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