A new synthetic route and catalytic characteristics of pillared rectorite molecular sieves

This paper presents a new synthetic route and catalytic characteristics of pillared rectorite molecular sieves (PR-MS). The PR-MS was prepared with aluminum pillaring agent improved by poly (vinyl alcohol) according to route of mixing, drying to take shape, washing, and calcination. It has wide pore structure with basal spacings of 27-30 Angstrom. Under same conversion their activity for cracking heavy oil is 3-4 wt % higher and total yields of gasoline and light cycle oil are 6-7 wt % higher than that of commercial cracking catalysts containing USY zeolites. The catalysts developed from the PR-MS and Y-zeolites have high catalytic activity and low bottom yield. The PR-MS has also good light olefin selectivity. The catalysts containing the PR-MS and ZSM-5 type molecular sieves are a class of cracking catalysts for maximizing olefin production.