加压条件下负载型杂多酸复合催化剂催化甲醇脱水制备二甲醚  

Conversion of Methanol into Dimethyl Ether over Supported Heteropoly Acid Composite Catalyst at Elevated Pressure

作　　者：王守国[1] 邵允[1] 王元鸿[1] 龚剑[1] 瞿伦玉[1] 

机构地区：[1]东北师范大学化学学院,吉林长春130024

出　　处：《分子催化》2001年第3期201-205,共5页Journal of Molecular Catalysis(China)

基　　金：吉林省科委工业处资助项目

摘　　要：合成了负载型杂多酸复合催化剂 HSi W- L a2 O3/γ- Al2 O3,并用吡啶吸附 IR光谱、 NH3- TPD、 N2 吸附、UV - DRS、 XPS和 XRD等手段 ,对催化剂进行了表征 .该催化剂具有中孔结构 ,表面上具有 L酸和 B酸 ,酸分布以弱酸为主 .探讨了杂多酸含量、反应压力、反应温度和质量空速对甲醇脱水制备二甲醚转化率与选择性的影响 .实验表明 ,当 HSi W含量为 10 %～ 16 %时 ,催化剂的活性最佳 .反应的最佳条件为压力 0 .75～ 0 .85 MPa(gauge) ,温度 2 80～ 32 0℃ ,质量空速 (MHSV)为 1.5～ 2 .5 h- 1 .Supported heteropoly acid composite catalyst—HSiW La 2O 3/ γ Al 2O 3 was prepared and was characterized by N 2 adsorption, pyridine adsorption IR spectrum, NH 3 TPD, UV DRS, XPS and XRD. The catalyst possesses mesopores. There are two types of acid—the Brnsted acid and Lewis acid-on the surface of the catalyst, and most of them are Lewis acid. The content of HSiW, reaction pressure, reaction temperature and mass hour space velocity(MHSV) were studied in order to obtain high conversion of methanol and high selectivity to DME. The experimental result indicate that the catalyst with HSiW content of 10%~16% has the better catalytic performance than the others. The optimal reaction conditions are pressure 0.75～0.85 MPa (gauge), temperature 280～320 ℃ and MHSV 1.5～2.5 h -1 .

关 键 词：甲醇 二甲醚 脱水 负载型杂多酸复合催化剂 硅钨酸 Γ-氧化铝 催化活性 

分 类 号：O623.423[理学—有机化学] O643.36[理学—化学]