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采用溶胶凝胶法中的金属醇盐水解技术制备LaMnAl11O19-δ六铝酸盐催化剂,通过X射线衍射、差热-热重、扫描电镜和比表面积分析等实验技术及甲烷燃烧,对催化剂的结构和性质进行了考察。主要考察了金属醇盐水解时加入不同含量的水对催化剂结构以及对甲烷催化燃烧活性的影响。结果表明,催化剂在1200℃焙烧后可以形成完整的六铝酸盐晶型,同时具有较高的催化性能和高温稳定性。水含量对催化剂的性能有较大的影响,水含量较大时催化剂的比表面积和活性明显下降。当水和醇盐的摩尔比为1.5时,所制备的LaMnAl11O19-δ具有较大的比表面积和催化活性。
LaMnAl11O19-δ hexaaluminate catalysts were prepared by metal alkoxide hydrolysis in sol-gel method. The structure of the catalyst was characterized by X-ray diffraction, DTA-TG, SEM and BET surface area analysis and methane combustion. And the nature of the inspection. The effects of adding different amounts of water on the catalyst structure and catalytic activity of methane during the hydrolysis of metal alkoxide were investigated. The results show that the catalyst can form a complete hexaaluminate crystal after calcination at 1200 ℃, and has high catalytic performance and high temperature stability. Water content has a greater impact on the performance of the catalyst, the water content of the catalyst when the specific surface area and activity decreased significantly. When the molar ratio of water to alkoxide is 1.5, the prepared LaMnAl11O19-δ has a large specific surface area and catalytic activity.