Abstract
Abstract A new shape selectivity index, RCN, the ratio of sorption of cyclohexane to that of n-hexane, is proposed as a simple and versatile measure to describe the shape selectivity of zeolite catalysts. The C.I. (constraint index) values for 12-membered-ring zeolites are around 1, and hence these are not satisfactory to describe observed discrimination. Another index, S.I. (spaciousness index), is applicable only to 12-membered-ring zeolites, since all the reported values for 10- and 8-membered ring zeolites are again ca. 1. RCN apparently discriminates among 8-, 10-, and 12-membered-ring zeolites, and is a linear function of their aperture size. C.I. and S.I. values for zeolites in their effective range were found to be linearly dependent on RCN. The applicability of RCN to describe shape-selective catalysts was demonstrated for the alkylation of naphthalene and biphenyl compounds.
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