Incorporation of titanium into mesoporous silica molecular sieve SBA-15

被引：343

作者：

Luan, ZH ^{[1
]}

Maes, EM ^{[1
]}

van der Heide, PAW ^{[1
]}

Zhao, DY ^{[1
]}

Czernuszewicz, RS ^{[1
]}

Kevan, L ^{[1
]}

机构：

[1] Univ Houston, Dept Chem, Houston, TX 77204 USA

来源：

CHEMISTRY OF MATERIALS | 1999年 / 11卷 / 12期

关键词：

D O I：

10.1021/cm9905141

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：

Mesoporous silica molecular sieve SBA-15 has been synthesized and incorporated with variable amounts of titanium via incipient-wetness impregnation with titanium isopropoxide in ethanol followed by calcination. Characterization by powder X-ray diffraction, nitrogen adsorption, X-ray photoelectron, Raman, and diffuse reflectance ultraviolet spectroscopies has been carried out to understand the chemical nature of the titanium. The results suggest that titanium is present in two distinct chemical farms and that their relative amounts depend on the titanium loading. At low titanium loading of 1 atom % relative to silicon, the titanium ions are monatomically dispersed and the pore size of SBA-15 is not altered. This isolated titanium species reaches a maximum concentration around 6 atom % relative to silicon. At higher titanium loading, titanium dioxide (anatase) is also formed. The materials with significant titanium dioxide formation have reduced pore diameters, which suggests that the titanium dioxide exists as a thin film anchored inside the mesopores of SBA-15. This new material may have potential as a novel catalyst.

引用

页码：3680 / 3686

页数：7

共 47 条

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