title: Trimethylsilylation of framework Brønsted acid sites in microporous zeolites and silico-aluminophosphates.
abstract: Framework-bound alkoxy groups are well-studied intermediates in zeolite chemistry, but their low stability complicates their spectroscopic study in high-temperature reactions such as alkylation or dealkylation. Taking advantage of the much higher bond strength of Si-O versus C-O, we synthesized trimethylsilylated zeolites by reacting them with phenyltrimethylsilane in a catalytic flow reactor at 648 K. In favorable cases, the reaction accurately titrated the acid sites, and 29Si and 13C MAS NMR spectra of the derivatized catalysts measured at room temperature confirmed the proposed reaction.
authors: Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, University Park, Los Angeles, CA 90089-1661, USA.
authors: Weiguo
authors: W
authors: Song
authors: David M
authors: DM
authors: Marcus
authors: Saifudin M
authors: SM
authors: Abubakar
authors: Emma
authors: E
authors: Jani
authors: James F
authors: JF
authors: Haw