In situ FTIR studies of extraframework aluminum bound methoxy species in H-ZSM-5 zeolites

✍ Scribed by Xuan-Zhen Jiang

• Book ID: 104423328
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 167 KB
• Volume: 121
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(96)00445-1

✦ Synopsis

In situ infrared spectra of dimethyl ether or methanol adsorbed on three H-ZSM-5 zeolites are reported which are different in both lattice and extraframework aluminium contents. A number of dissociatively adsorbed dimethyl ether species associated respectively with the Brønsted acid sites, the external silanol groups and extraframework aluminium species at Ž . differing temperatures are identified. In particular, dimethyl ether or methanol reacts with non-acidic hydroxyl species associated with extraframework aluminium to form a third type of methoxy species, i.e. an extraframework aluminum bound methoxy group.