On the nature of water bound to a solid acid catalyst

L. Smith, A. K. Cheetham*, R. E. Morris, L. Marchese, J. M. Thomas, P. A. Wright, J. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

162 Citations (Scopus)


The nature of the species formed when water interacts with Brønsted acid sites in a microporous solid acid catalyst, HSAPO-34, was studied by powder neutron diffraction and infrared spectroscopy. Previous infrared and computational studies had failed to unambiguously establish whether water is protonated to form hydronium (H3O+) ions or is merely hydrogen-bonded to acid sites inside the zeolite. Our experiments clearly showed that both species are present: An H3O+ ion is found in the eight-ring channel of the zeolite and a second water molecule is hydrogen-bonded to an acid site on the six-ring.

Original languageEnglish
Pages (from-to)799-802
Number of pages4
Issue number5250
Publication statusPublished - 9 Feb 1996


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