Coadsorption of toluene and methanol on HZSM-5 zeolites

Gabriele Mirth, Johannes A. Lercher

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72 Scopus citations


Coadsorption of toluene and methanol on HZSM-5 at 308 and 473 K was studied to investigate adsorption complexes formed in the zeolite pores prior to alkylation reactions. Methanol is adsorbed in the form of methoxonium ions at the Si-O--Al groups of the zeolite, and toluene is hydrogen bonded to these methoxonium ions. The thermal stability of the coadsorption complex, however, is low, as concluded from temperature-programmed desorption (TPD) measurements. Toluene desorbs prior to methanol, dimethyl ether in minor amounts is the only reaction product detected in the gas phase during TPD.

Original languageEnglish
Pages (from-to)3736-3740
Number of pages5
JournalJournal of Physical Chemistry
Issue number9
StatePublished - 1991
Externally publishedYes


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