INFLUENCE OF FRAMEWORK AND NONFRAMEWORK ALUMINUM ON THE ACIDITY OF HIGH-SILICA, PROTON-EXCHANGED FAU-FRAMEWORK ZEOLITES

被引：167

作者：

BEYERLEIN, RA ^{[1
]}

MCVICKER, GB ^{[1
]}

YACULLO, LN ^{[1
]}

ZIEMIAK, JJ ^{[1
]}

机构：

[1] EXXON RES & ENGN CO,ROUTE 22 E,ANNANDALE,NJ 08801

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1988年 / 92卷 / 07期

关键词：

ALUMINUM AND ALLOYS - CATALYSIS - CATALYSTS - Materials - HYDROCARBONS - Processing;

D O I：

10.1021/j100318a051

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：

Measured selectivities and activities in isobutane conversion investigations on high-silica FAU materials prepared by different methods of dealumination indicate that the strong acidity exhibited by hydrothermally dealuminated (ultrastable) materials, while directly related to framework aluminum content, depends on a balance between aluminum in the framework and dislodged or nonframework aluminum that is entrained in the lattice during steam treatment. Isobutane conversions over ultrastable FAU materials containing low fractions of dislodged aluminum exhibit markedly enhanced activities, indicating that conventionally prepared ultrastable materials may contain a higher fraction of dislodged aluminum than is optimum.

引用

页码：1967 / 1970

页数：4