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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...
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