Effect of the flowing gases of steam and CO₂ on the texture and catalytic activity for methane combustion of MgO powders

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• 作者：Fei Teng ; Wei Qu ; Guodong Wen ; Zheming Wang ; Zhijian Tian ; Xiaomei Yang ; Ping Xu ; Yongfa Zhu ; Guoxing Xiong
• 关键词：MgO ; CO₂/H₂O ; Pore size distribution ; Surface area ; Methane combustion
• 刊名：Microporous and Mesoporous Materials
• 出版年：2008
• 期刊代码：78_13871811
• 类别：ch
• 出版时间：15 April 2008
• 卷：111
• 期：1-3
• 页码：620-626
• 文件大小：744 K

摘要

In this work, the MgO powders was prepared by the precipitation method with carbonate following calcination at 1200 °C, and then the obtained MgO powders was treated under the flowing gaseous mixture of steam and CO₂. The variations of textural properties and activity for methane combustion of the MgO sample were investigated. The sample was characterized by N₂ adsorption isotherm, TEM, XRD, and TG-DTA. The results showed that the treatment temperature and the CO concentration have a significant influence on the textural properties of the MgO sample. After run at 700 °C for 24 h under the flowing gaseous mixture of steam/CO₂/N₂ (CO₂/N₂ = 15/85 volume ratio), the maximum pore sizes varied and the pore volumes increased obviously; and remarkably, the surface area of the MgO sample increased from 37.9 to 80.1 m² g⁻¹. It was proposed that during the process, the disaggregation and rearrangement of the particles have occurred, leading to the obvious variations of the textural properties of the sample. As a result, the treated MgO sample showed a higher activity for methane combustion than the original one.