介孔氧化铝的制备及其在甲醇脱水制二甲醚反应中的应用  

Preparation of Mesoporous Alumina and Its Application in Dehydration of Methanol to Dimethyl Ether

作　　者：聂仁峰[1] 王军华[1] 费金华[1] 侯昭胤[1] 郑小明[1] 

机构地区：[1]浙江大学化学系催化研究所,浙江杭州310028

出　　处：《催化学报》2011年第2期379-384,共6页

基　　金：国家自然科学基金(21073159;90610002);浙江省自然科学基金(Z406142);国家重点基础研究发展计划(973计划;2007CB2l0207)

摘　　要：以硝酸铝为铝源,以十六烷基三甲基溴化铵为阳离子模板剂,采用均匀沉淀法成功制得热稳定性较高和高度有序的介孔Al2O3(其比表面积179.8m2/g,孔径5.4nm,孔体积0.3cm3/g),并用于甲醇脱水制二甲醚反应中.结果表明,在280oC,液时空速为30h-1条件下,甲醇转化率为90.2%,二甲醚时空收率最高可达15.4g/(g·h).通过制备方法的对比和催化剂的酸性表征,进一步探讨了介孔Al2O3结构和酸性等对其催化活性的影响,发现催化剂活性与其酸密度密切相关.Ordered mesoporous alumina was synthesized by the homogeneous precipitation method from aqueous Al（NO3）3·9H2O solution using cationic cetyltrimethylammonium bromide as template.Characterization results showed that the surface area,average pore diameter,and pore volume of the calcined mesoporous alumina are 179.8 m2/g,5.4 nm and 0.3 cm3/g,respectively.Over the mesoporous alumina,the space time yield of dimethyl ether（DME） in methanol dehydration reaches 15.4 g/（g·h） at 280 oC and 30 h-1 with 90.2% methanol conversion.The activity of the mesoporous alumina samples for methanol dehydration to DME was compared.The detected activity for methanol dehydration strongly depends on the surface acid density of the alumina.

关 键 词：介孔氧化铝 甲醇 脱水 二甲醚 均匀沉淀法 

分 类 号：TQ223.24[化学工程—有机化工]