The variety of Bronsted acid sites in amorphous aluminosilicates and zeolites

被引：47

作者：

Caillot, Maxime ^{[1
,2
]}

Chaumonnot, Alexandra ^{[2
]}

Digne, Mathieu ^{[2
]}

van Bokhoven, Jeroen A. ^{[1
,3
]}

机构：

[1] ETH, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland

[2] IFP Energies Nouvelles, Direct Catalyse & Separat, Rondpoint Echangeur Solaize, F-69360 Solaize, France

[3] Paul Scherrer Inst, Lab Catalysis & Sustainable Chem, CH-5232 Villigen, Switzerland

来源：

JOURNAL OF CATALYSIS | 2014年 / 316卷

关键词：

ASA; Zeolite; Bronsted acidity; Siralox; TGA; M-XYLENE ISOMERIZATION; SILICA-ALUMINA; ETHANOL DEHYDRATION; TURNOVER FREQUENCY; SURFACE-ACIDITY; CO ADSORPTION; IR; CATALYSTS; ALCOHOLS; FTIR;

D O I：

10.1016/j.jcat.2014.05.002

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：

Bronsted acid sites of similar strength to those in zeolites are found in ASAs prepared by cogelation, as shown by thermogravimetric study of the dehydration of ethanol to ethylene. ASAs prepared by grafting and a commercial ASA (Siralox 30) show Bronsted acid sites that differ from those of zeolites. CO respectively ethanol adsorption followed by infrared spectroscopy identified the OH stretching frequency of the Bronsted acid sites specific to Si/Al2O3 and Al/SiO2 materials obtained by grafting to be ca. 3600 cm(-1) and 3640 cm(-1), respectively, although the intensity of the corresponding band is weak. These sites, contrary to those of a H-USY zeolite with very few extra-framework aluminum, are highly sensitive to the surface hydration state: Their number decreases with increasing temperature. The surface structure of Siralox 30 resembles that of Si/Al2O3 prepared in anhydrous conditions, showing similar isosurface acidic properties and distribution of silicon species. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：47 / 56

页数：10

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