1999•ACS symposium seriesRequires access

The Investigation on the Crystallinity of USY Zeolite during Hydrothermal Dealumination

Yuling Chen

Abstract

Hydrothermal dealumination is an important way for improving hydrothermal stability and catalytic activity of Y-zeolite. The changes in relative crystallinity of zeolite E prepared by hydrothermal-chemical dealumination and zeolite A prepared by conventional hydrothermal dealumination were characterized by IR, XRD, TEM, etc.. It was illustrated that the crystallinity of product E was greater than that of its precursor, HY. As compared with zeolite A, the zeolite E possessed higher crystallinity (≊100%) and more developed secondary pore system which would benefit bottoms conversion.

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Key concepts: Crystallinity, Zeolite, Hydrothermal circulation, Chemical engineering, Hydrothermal synthesis, Materials science, Inorganic chemistry, Mineralogy