ON THE UNUSUAL MECHANISM OF LEWIS ACIDITY MANIFESTATION IN HZSM-5 ZEOLITES

被引：69

作者：

MEDIN, AS ^{[1
]}

BOROVKOV, VY ^{[1
]}

KAZANSKY, VB ^{[1
]}

PELMENTSCHIKOV, AG ^{[1
]}

ZHIDOMIROV, GM ^{[1
]}

机构：

[1] ACAD SCI USSR, INST CATALYSIS, NOVOSIBIRSK, USSR

来源：

ZEOLITES | 1990年 / 10卷 / 07期

关键词：

HZSM-5; i.r; spectroscopy; Lewis acidic sites;

D O I：

10.1016/0144-2449(90)90077-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption of CD3CN and NH3 on HZSM-5 zeolites containing prechemisorbed olefins were studied using diffuse reflectance i.r. spectroscopy. It is shown that in the presence of strong bases the unusual manifestation of Lewis acidity in these zeolites takes place as a result of fission of the Al←O bond in bridged alkoxyl groups by adsorbed base molecules. Nonempirical quantum-chemical calculations confirm this experimental finding and define the requirements of such Lewis acidity generation. © 1990.

引用

页码：668 / 673

页数：6

共 18 条

[1]

ALEXEEV AA, 1982, VESTN AN SSSR+, V264, P626

[2] INFRARED SPECTROSCOPIC INVESTIGATION OF ZEOLITES AND ADSORBED MOLECULES .4. ACETONITRILE [J].