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The type and concentration of hydroxy groups in MCM-41 as a function of the Si : A1 ratio have been investigated and compared with amorphous Si/Al oxide. Three hydroxy groups at 3745, 3715 and 3530 cm-' were observed in the IR spectra of siliceous MCM-41. For Al-containing samples the intensity of the bands at 3715 and 3530 cm-' increased with increasing A1 concentra-Paper 6/01807F;

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Based on data of n-butane conversion over HZSM5, different transition states are proposed for the Bronsted acid catalyzed reactions of alkanes involving carbonium ions as intermediates. Hydrogen~zleuterium exchange, dehydrogenation and cracking are proposed to proceed via pentacoordinated carbonium ions that are stabilized by the zeolite lattice.

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