Journal
JOURNAL OF CATALYSIS
Volume 213, Issue 1, Pages 39-46Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9517(02)00026-X
Keywords
coking; methanol; H-MFI; Raman; polyolefin; cyclopentadiene; polyaromatic
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The formation of retained hydrocarbons or coke in the conversion of methanol and dimethylether to hydrocarbons over zeolite H-MFI was studied using ultraviolet Raman spectroscopy. Polyolefin, cyclopentadienyl species, and polyaromatic hydrocarbons have been identified among the retained hydrocarbons from the Raman spectra. The results strongly support a reaction mechanism, proposed previously, where cyclopentadienyl species are identified as a key intermediate in the formation of aromatic and polyaromatic hydrocarbons by ring expansion. The spectra also suggest that the polyaromatic hydrocarbons have a chain-like topology, similar to polycenes, rather than a two-dimensional, sheet-like topology, similar to pyrene or coronene. (C) 2003 Elsevier Science (USA). All rights reserved.
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