Determining an optimum catalyst for liquid-phase dehydration of methanol to dimethyl ether

作者：Khandan Nahid; Kazemeini Mohammad^*; Aghaziarati Mahmoud

来源：Applied Catalysis A: General , 2008, 349(1-2): 6-12.

DOI：10.1016/j.apcata.2008.07.029

• Dehydration
• Methanol
• Dimethyl ether
• Zeolite
• Mordenite

The liquid-phase dehydration of methanol to dimethyl ether was investigated over various materials including synthetic zeolites, namely, ZSM-5, Y, Mordenite, Ferrierite and Beta as well as silica and alumina. The key characters investigated were the Si/Al ratio and cation exchange. The results showed that the Mordenite zeolite exchanged with H+ exhibited the highest activity in dehydration of methanol. After finding the most active catalyst, the Mordenite zeolite was modified with Cu, Zn, Ni, Al, Zr, Mg and Na via wet-impregnation method to further improve its selectivity, and characterized by AAS, XRD, NH3-TPD, NH3-FT-IR and BET Surface area techniques. It was found that these materials affected activity of HM zeolite by changing its acidity. Ultimately, amongst all catalysts studied, Al-modified Mordenite zeolite exhibited optimum activity, selectivity and stability for methanol dehydration to dimethyl ether.

• 出版日期2008-10-31