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对水热法制备的LaMnAl11O19-α(LMA)催化剂和微乳液法制备的Ce0 .5Ba0 .5MnAl11O19-α(CBMA)催化剂进行了 10 0h的甲烷催化燃烧活性试验 ,考察了反应条件下的水蒸气处理对催化剂的结构和甲烷催化燃烧活性的影响。结果表明 :反应条件下的水蒸气处理促进了水热法制备的LMA催化剂中的六铝酸盐相晶粒长大 ,比表面积降低 ,从而引起活性下降。对微乳液法制备的CBMA催化剂 ,反应条件下的水蒸气处理使得催化剂中的γ -Al2 O3转化为α -Al2 O3从而引起比表面积的大幅度降低 ,但催化活性没有出现明显变化 ,仍保持着较高的甲烷燃烧活性。
The catalytic activity of methane for 100h was tested on LaMnAl11O19-α (LMA) catalyst prepared by hydrothermal method and Ce0.5Ba0.5MnAl11O19-α (CBMA) catalyst prepared by microemulsion method. The effects of steam treatment On the structure of the catalyst and the catalytic activity of methane combustion. The results show that the steam treatment under the reaction conditions promotes the growth of the hexaaluminate grains in the LMA catalyst prepared by the hydrothermal method, and the reduction of the specific surface area leads to the decrease of the activity. For the CBMA catalyst prepared by the microemulsion method, the steam treatment under the reaction conditions resulted in the conversion of γ -Al 2 O 3 in the catalyst into α -Al 2 O 3, which led to the significant reduction of the specific surface area, but no significant change in the catalytic activity Higher methane combustion activity.