Inhomogeneity in the interaction between methanol molecules and Brønsted acid sites of H-ZSM-5 directly detected by 2D CPMAS 13C NMR spectroscopy

Abstract

1D and 2D exchange ¹³C NMR investigation of the states of methanol adsorbed on H-ZSM-5 at ambient temperature demonstrates the coexistence of methanol strongly interacting with Brønsted acid sites and methanol physisorbed or hydrogen-bonded, and provides the first spectroscopic evidence of a wide distribution in the strength of its interaction with Brønsted acid sites.