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College Park, Maryland      June 6 - 10 , 2004

TP2: Structural Comparison of Two EUO-type Zeolites Investigated by Neutron Diffraction

I. Peral (Department of Materials Science and Engineering, University of Maryland; NIST Center for Neutron Research), C. Y. Jones (NIST Center for Neutron Research), S. P. Varkey (Department of Chemical Engineering, Northwestern University, Evanston, IL 60208), R. F. Lobo (Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716)

Souverijns et al. [1] found different molecular selectivity properties in two EUO-types zeolites that are crystallized in presence of two organic templates: hexamethonium (HM) and dibenzylammonium ions (DBDMA). They suggested that this dissimilarity in the molecular shape selectivity is originated from a different distribution of the active sites over the side pockets and the main channels of the EUO zeolites. We have studied the structure of both zeolites by neutron diffraction to investigate their thesis. The structural comparison of the two EUO-type zeolites agrees with the model proposed by Souverijns et al. [1].

[1] W. Souverijns, L. Rombouts, J.A. Martens and P.A. Jacobs, Microporous Materials, 4 (1995) 123.

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