초록

The acid activity of a high silica content crystalline zeolite that contains framework boron is increased by hydrolyzing a portion of the boron and compositing the crystals with a binder that contains alumina.

대표청구항 ▼

An improved method for enhancing the catalytic activity of a composition consisting essentially of crystals of a high silica content crystalline zeolite that contains from about 0.1 wt % to about 2.5 wt % of framework boron, said crystals having a silica to alumina mole ratio of at least 100, which

An improved method for enhancing the catalytic activity of a composition consisting essentially of crystals of a high silica content crystalline zeolite that contains from about 0.1 wt % to about 2.5 wt % of framework boron, said crystals having a silica to alumina mole ratio of at least 100, which method comprises simultaneously treating and compositing said crystals under hydrous conditions with fine particles of an alumina-containing material whereby from about 10% to about 95% of said boron is hydrolyzed and said catalytic activity is increased, and recovering said composited treated crystals of enhanced catalytic activity. The method described in claim 2 wherein said high silica crystalline zeolite has a silica to alumina ratio greater than about 500 and is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.