Abstract
The conversion of CH3OH by the hydrogen forms of three offretites with different contents of framework Al and Ga has been monitored by 13C NMR with magic-angle spinning. At 150 °C methanol is dehydrated to dimethyl ether. No hydrocarbons are produced below 300 °C, and the equilibrium product distribution is achieved only at 370 °C. The distribution of both the intermediates and the final products is different for each of the three catalysts. Thus, branched long-chain hydrocarbons form in the intracrystalline space of Ga-offretite but not in Al,Ga- and Al-offretites. More methane is formed over the aluminum-containing samples, ca. 3.2% in Al-offretite and ca. 3.7% in Al,Ga-offretite, than in Ga-offretite (ca. 2.0%). No appreciable amount of aromatic species is detected at any temperature. We believe that the methanol-to-gasoline process over Al,Ga-offretites is bifunctional and involves Bronsted acid sites as well as extraframework Ga species.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
