Surface enhanced dynamic nuclear polarization solid-state NMR spectroscopy sheds light on Bronsted-Lewis acid synergy during the zeolite catalyzed methanol-to-hydrocarbon process.

ABSTRACT: After a prolonged effort over two decades, the reaction mechanism of the zeolite-catalyzed methanol-to-hydrocarbon (MTH) process is now well-understood: the so-called 'direct mechanism' (via direct coupling of two methanol molecules) is responsible for the formation of the initial carbon-carbon bonds, while the hydrocarbon pool (HCP)-based dual cycle mechanism is responsible for the formation of reaction products. While most of the reaction events occur at zeolite Brønsted acid sites, the addition of Lewis acid sites (i.e., via the introduction of alkaline earth cations like calcium) has been shown to inhibit the formation of deactivating coke species and hence increase the catalyst lifetime. With the aim to have an in-depth mechanistic understanding, herein, we employ

SUBMITTER: Dutta Chowdhury A 

PROVIDER: S-EPMC7068724 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature