Zeolite-β with different crystal sizes have been used as catalysts for gas-oil cracking. An optimum compromise between stability, activity and selectivity, has been found for a sample with an average crystal size of 0.40 μm. This sample, before and after steaming gives a slightly lower selectivity for gasoline and coke than a high and a low unit cell size USY zeolite, respectively. The optimized zeolite- β produces more liquified petroleum gas alkenes and a relatively high i-butane yield that are useful for methyl tert. butyl ether and alkylation gasoline production.
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