
%0 Journal Article
%A Sayed, MB 
%A Cooney, RP 
%T A mechanism for methanol conversion over HZSM-5 catalyst
%J Australian Journal of Chemistry
%D 1982/12/01
%V 35
%N 12
%P 2483-2495
%K 
%R https://doi.org/10.1071/CH9822483
%U https://www.publish.csiro.au/paper/CH9822483 
%X Mechanistic stages in the conversion of methanol into hydrocarbons, over the zeolitic catalyst HZSM-5, have been studied by means of infrared spectroscopy. Data are reported for both internal surface and gas-phase species. Evidence is presented on the following aspects: the involvement of Lewis sites in the initial dehydration of methanol; the existence of carboxylate side reactions generating CO and CO2; a role for intermediate isobutene; and the reformation of methanol. The extent of the CO2 side reaction appears to correlate with the extent of aromatic product formation. This is interpreted in terms of the involvement of the co-product, hydrogen, in the disproportionation of aromatic products. These observations are embodied in a mechanism invoking both organic species and surface sites for the overall process. 
