Abstract
Interior hydroxyl groups of molecular sieves MCM-41 and MCM-48 are investigated by NMR, FTIR and TG/DTA. The results show that in both mesoporous materials, 26–30% of the Si atoms carry OH groups. The internal surface is hydrophilic. Exchange experiments with D 2 and NH 3 adsorption studies show that these silanol groups are freely accessible and not acidic. MCM-48 contains more associated terminal OH groups than MCM-41 which could result in different reactivities towards grafting agents. Beside the silanol groups, Brønsted-acid sites are unambiguously detected after aluminum substitution.
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.
