Md. Alba et al., KINETIC-STUDIES OF THE DEHYDRATION OF METHANOL OVER ALUMINOSILICATE AND GALLOSILICATE OFFRETITES, Journal of the Chemical Society. Faraday transactions, 93(6), 1997, pp. 1221-1224
Citations number
33
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The kinetics of the dehydration of CH3OH by the hydrogen forms of thre
e offretites with different contents of framework Al and Ga have been
monitored by C-13 magic-angle-spinning (MAS) NMR spectroscopy. No reac
tion takes place at room temperature. At 150 degrees C methanol is deh
ydrated to dimethyl ether. As expected, the catalytic activity of offr
etite for this reaction is lower than that of zeolite ZSM-5, and it de
creases with increasing framework gallium content. The rates of the de
hydration reaction are 0.045, 0.863 and 1.136 a.u.(-1) s(-1) for Ga-,
Al,Ga- and Al-offretites, respectively.