Mechanistic differences between methanol and dimethyl ether in zeolite-catalyzed hydrocarbon synthesis.

ABSTRACT: Water influences critically the kinetics of the autocatalytic conversion of methanol to hydrocarbons in acid zeolites. At very low conversions but otherwise typical reaction conditions, the initiation of the reaction is delayed in presence of H₂O. In absence of hydrocarbons, the main reactions are the methanol and dimethyl ether (DME) interconversion and the formation of a C₁ reactive mixture-which in turn initiates the formation of first hydrocarbons in the zeolite pores. We conclude that the dominant reactions for the formation of a reactive C₁ pool at this stage involve hydrogen transfer from both MeOH and DME to surface methoxy groups, leading to methane and formaldehyde in a 1:1 stoichiometry. While formaldehyde reacts further to other C₁ in

SUBMITTER: Kirchberger FM 

PROVIDER: S-EPMC8794837 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature