Synthetic and natural mordenites were used for the preparation of bulk and shell-catalysts in order to compare their catalytic characteristics. Hydroisomerization of n-hexane was applied as a test reaction. The catalytic activity of shell-catalysts was markedtly higher than that of bulk-catalysts although the amount of the active substance was the same. The decrease of shell thickness raised the catalytic activity and decreased the amount of coke deposited on the catalyst surface. The variation of the catalytic properties could partly be explained by the change of number and strength of the acidic centres.
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