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A cracking catalyst composition for petroleum feedstocks b. >343°C, with increased selectivity to C 3-4 -alkenes and a C 5+ -gasoline fraction, consists of zeolite β and a shape-selective zeolite with a constraint index of 3-12, at a (wt% shape-selective zeolite)/(wt% shape-selective zeolite + zeolite β) ratio of 0.01-0.95 (matrix-free basis). Suitable shape-selective...