Abstract
Surface species created by the interaction of methanol and ethanol with HZSM-5 zeolite were studied using mass spectrometry with chemical traps at the temperature of the initial formation of olefins. C 1 species formed by the interaction of the zeolite with methanol (surface methoxyls and formaldehyde-like species) were found to react readily with benzene, ethane, propane and ethylene yielding primarily [ n + (CH 2) 1] homologues of these scavengers ( n). Surface ethanol species exhibited lower activity towards these chemical traps, reacting only with benzene to give ethylbenzene. Isotopic exchange experiments confirmed a weakening of the β-hydrogen bonds of ethanol during interaction with the zeolite.
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