COAPO MOLECULAR-SIEVE ACIDITY INVESTIGATED BY ADSORPTION CALORIMETRY AND IR SPECTROSCOPY

被引：56

作者：

JANCHEN, J ^{[1
]}

PEETERS, MPJ ^{[1
]}

ANWOLPUT, MHMC ^{[1
]}

WOLTHUIZEN, JP ^{[1
]}

VANHOOFF, JHC ^{[1
]}

LOHSE, U ^{[1
]}

机构：

[1] CTR HETEROGENEOUS CATALYSIS, D-12489 BERLIN, GERMANY

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1994年 / 90卷 / 07期

关键词：

D O I：

10.1039/ft9949001033

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 acidic properties of cobalt- and silicon-substituted AlPO-5, -11 and -44 have been characterized by adsorption calorimetry and IR measurements. Adsorption calorimetric measurements indicate that the adsorption potential of the samples for acetonitrile is enhanced upon cobalt incorporation. The calorimetrically measured heats of adsorption indicate the formation of strong acid sites, due to this cobalt incorporation, as well as the presence of weaker acid sites, probably terminal P-OH groups. IR measurements of adsorbed ammonia and acetonitrile indicate that some Bronsted-bonded ammonia and acetonitrile are present, in combination with Lewis-bonded species. The Bronsted-bonded species presumably originate from interaction of the base with the weakly acidic P-OH groups. The Lewis-bonded species are due to the coordinative interaction of the lone pair of the base with framework cobalt ions.

引用

页码：1033 / 1039

页数：7

共 35 条

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