LaDAlY型沸石表面羟基和酸性的研究

高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (5): 654.

LaDAlY型沸石表面羟基和酸性的研究

傅军, 鲍书林, 须沁华

南京大学化学系, 南京, 210008

收稿日期:1991-05-20 出版日期:1992-05-24 发布日期:1992-05-24
通讯作者: 须沁华
基金资助:
国家自然科学基金

Studies on the Surface OH Groups and Acidic Properties of LaDAIY

FU Jun, BAO Shu-lin, Xu Qin-hua

Department of Chemistry, Nanjing University, Nanjing, 210002

Received:1991-05-20 Online:1992-05-24 Published:1992-05-24

摘要/Abstract

摘要： 应用红外光谱和NH₃-TPD法对LaDAlY型沸石的表面羟基和酸性进行了研究,从将La³⁺离子引入NH₄Y和DAlY后表面羟基的变化中探讨了La³⁺离子在NH₄Y和DAlY中的分布,吡啶吸附及脱附的红外光谱表明,在DAlY中引入La³⁺后B酸和L中心数均减少;NH₃-TPD的结果表明,在DAlY中引入La³⁺离子后,其弱酸中心的强度稍有增加,而强酸中心的强度基本不变,酸中心数一般减少,其结果与吡啶-IR结果一致。

关键词: LaHY, LaDAlY, LaDAlY的表面羟基

Abstract: The surface hydroxyl groups and acidic properties of LaDAlY were examined by means of IR spectroscopy with pyridine adsorption and NH₃-TPD method.From the variations of hydroxyl groups, it is shown that La³⁺ ions are located at different positions in NH₄Y and DA1Y.The experiments further indicate that the number of both Bronsted and Lewis acid sites on DA1Y and NH₄Y was decreased after La³⁺ ions-exchanged.The NH₃-TPD results show that the strength of weak acid sites of DA1Y was increased, while the strength of strong acid sites was almost not changed after La³⁺ ions-exchanged, and the number of acid intes was decreased generally.The results are consistent with these obtained by infrared studies.

Key words: LaHY, LaDAlY, Surface hydroxyls in LaDAlY

TrendMD:

傅军, 鲍书林, 须沁华. LaDAlY型沸石表面羟基和酸性的研究. 高等学校化学学报, 1992, 13(5): 654.

FU Jun, BAO Shu-lin, Xu Qin-hua . Studies on the Surface OH Groups and Acidic Properties of LaDAIY. Chem. J. Chinese Universities, 1992, 13(5): 654.