Dehydrogenation–cracking synergistic pathway of n–pentane by core–shell MFI zeolite to produce light olefins

A core@shell MFI type zeolite supporting PtZn alloys catalyst was prepared by dry gel conversion method, which is used for catalytic cracking of n–pentane. The shell and core of catalyst is composed of nanosheet silicalite–1 and microporous ZSM–5, respectively. A proposed dehydrogenation–cracking pathway was demonstrated, which facilitate the generation of light olefins. At 600 °C with WHSV of 6.26 h−1, the yield of ethylene and propylene in the product attained up to 35.3 wt% and 33.4 wt%, respectively.