Dehydration of methanol to dimethyl ether over nanocrystalline Al2O3 with mixed γ- and χ-crystalline phases

被引：69
|
作者：
Khom-in, Jutharat [1 ]
Praserthdam, Piyasan [1 ]
Panpranot, Joongjai [1 ]
Mekasuwandumrong, Okorn [2 ]
机构：
[1] Chulalongkorn Univ, Fac Engn, Dept Chem Engn, Ctr Excellence Catalysis & Catalyt React Engn, Bangkok 10330, Thailand
[2] Silpakorn Univ, Fac Engn & Ind Technol, Dept Chem Engn, Nakhon Pathom 73000, Thailand
来源：
CATALYSIS COMMUNICATIONS | 2008年 / 9卷 / 10期
关键词：
methanol dehydration; dimethyl ether (DME); gamma-A1203; chi-Al203; mixed phases;
D O I：
10.1016/j.catcom.2008.03.009
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Dehydration of methanol to dimethyl ether (DME) was investigated over a wide range of narrocrystalline Al2O3 with mixed gamma- and chi-crystalline phases. The catalysts were characterized by X-ray diffraction (XRD), N-2 physisorption, ion-exchange titration, and NH3-tempearture programmed desorption (NH3-TPD). It was found that gamma-Al2O3 catalyst containing 20 wt% of chi-phase exhibited the highest yield (86%) with good stability for DIME synthesis. The NH3-TPD and ion-exchange titration results revealed that the existence of 20 wt% chi-phase in gamma-Al2O3 increased significantly both the density and the strength of surface acidity of alumina. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1955 / 1958
页数：4
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