Alumina-Supported Rare-Earth Oxides Characterized by Acid-Catalyzed Reactions and Spectroscopic Methods

Acid−base properties of alumina-supported rare-earth oxides (Ln/Al2O3; Ln = La, Ce, Eu, Tb, and Yb) were investigated with α-pinene isomerization, 2-butanol decomposition, and temperature-programmed desorption and FTIR techniques. The structural characterization was carried out by means of XRD, Rama...

Full description

Saved in:
Bibliographic Details
Published in:The journal of physical chemistry. B 2001-03, Vol.105 (9), p.1908-1916
Main Authors: Yamamoto, Takashi, Tanaka, Tsunehiro, Matsuyama, Takahiro, Funabiki, Takuzo, Yoshida, Satohiro
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Acid−base properties of alumina-supported rare-earth oxides (Ln/Al2O3; Ln = La, Ce, Eu, Tb, and Yb) were investigated with α-pinene isomerization, 2-butanol decomposition, and temperature-programmed desorption and FTIR techniques. The structural characterization was carried out by means of XRD, Raman, and XAFS spectroscopies. Differences in the catalyses, acid−base properties, and structures of Ln/Al2O3 catalysts because of loaded elements and the amounts were discussed. The addition of a lanthanoid atom (Ln) to γ-Al2O3 poisons both the original base and acid sites of γ-Al2O3 and generates new-type Lewis acid site. In a series of Ln/Al2O3 catalysts, 0.2−0.5 mmol of Yb/Al2O3 exhibited the highest activity for α-pinene isomerization. The supported Yb species form Yb−O−Al linkage which acts as a Lewis acid. The local structure around Yb and a generation mechanism of acidic property are analogous with Yb/Al2O3 and Yb/SiO2.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp003589x