关键词: 分子筛, 氮化, 原位漫反射红外, 酸碱性, 前驱体

Abstract: Nitrogen-incorporated microporous zeolites were prepared by calcining Y zeolite and HZSM-5 zeolite precursors at 800 ℃ and with pure ammonia as nitrogen source.The structure and acid-base properties of the samples were investigated by means of elemental analysis，nitrogen adsorption-desorption，XRD，and DRIFTS etc..Results indicated NaY was a good precursor which could obtain high BET surface area and intact structure of nitrogen-incorporated zeolite. DRIFTS experiments confirmed that N atoms have been introduced into the framework of each zeolite by nitridation to form —NH₂— or —NH—species.Moreover，Br-nsted and Lewis acid sites coexisted in two zeolites.When nitridation at high temperature， Br-nsted acid sites decreased sharply while Lewis acid sites changed slightly and the alkalinity became stronger.

Key words: zeolite, nitridation, in-situ DRIFTS, acidity and basicity, precursor