Abstract
The catalytic properties of Hungarian natural H-mordenite and H-clinoptilolite were studied. The accompanying substances in the rock were found to be catalytically inactive in the reaction investigated. The active centers of clinoptilolite and mordenite are the OH groups with IR bands at 3610 and 3600 cm−1, respectively. In the case of activation above 550 °C, active sites are also the Lewis centers formed during dehydroxylation. The initial rate of m-xylene isomerization can be described by a Langmuir type equation. In a single reaction step the shift of the methyl groups occurs only between two neighboring carbon atoms of the benzene ring.
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