以四水乙酸镁为前驱体,以大米粉形成的凝胶为模板,采用新的凝胶-模板法制各了一系列的氧化镁材料,并用X射线衍射、扫描电镜、低温氮气吸附-脱附、X射线荧光分析、热重-差示扫描量热、CO2程序升温脱附和氨程序升温脱附等手段对样品进行了表征.该方法主要利用大米粉在水中加热形成凝胶来分散镁盐前驱体,再通氧焙烧去除模板从而获得多孔MgO材料.结果表明,制得的MgO具有高比表面积(可达206m2/g)和双介孔结构(孔径分别位于3.9和5~40nm附近).与直接焙烧四水乙酸镁制得的MgO相比,这类新型高比表面积MgO具有较多的强碱位和较少的酸性位,并在异丙醇催化分解反应中表现出更高的丙酮收率和选择性,有望成为一类优良的固体碱催化剂.
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