J Am Chem Soc. 2017 May 24;139(20):6888-6898. doi: 10.1021/jacs.7b01422. Epub 2017 May 09.

Periodic Trends in Olefin Epoxidation over Group IV and V Framework-Substituted Zeolite Catalysts: A Kinetic and Spectroscopic Study.

Journal of the American Chemical Society

Daniel T Bregante, David W Flaherty

PMID: 28453262 DOI: 10.1021/jacs.7b01422

Abstract

Group IV and V framework-substituted zeolites have been used for olefin epoxidation reactions for decades, yet the underlying properties that determine the selectivities and turnover rates of these catalysts have not yet been elucidated. Here, a combination of kinetic, thermodynamic, and in situ spectroscopic measurements show that when group IV (i.e., Ti, Zr, and Hf) or V (i.e., Nb and Ta) transition metals are substituted into zeolite *BEA, the metals that form stronger Lewis acids give greater selectivities and rates for the desired epoxidation pathway and present smaller enthalpic barriers for both epoxidation and H

Publication Types

• Journal Article
• Research Support, U.S. Gov't, Non-P.H.S.