Shape-Selective Catalysis Determined by the Volume of a Zeolite Cavity: Selective Production of Propylene

Highly selective production of C₃H₆ from olefins (C₂H₄, C₄H₈ and C₅H₁₀) can be accomplished by employing a new concept of b-scission of the specific carbenium ions: adjusting the pore volume of a zeolite to accommodate the volume of the specific carbenium ions, as opposed to a conventional molecular sieve approach.