SURFACE-ACIDITY AND PROPERTIES OF TITANIA-SILICA CATALYSTS

被引：44

作者：

GALANFERERES, M ^{[1
]}

ALEMANY, LJ ^{[1
]}

MARISCAL, R ^{[1
]}

BANARES, MA ^{[1
]}

ANDERSON, JA ^{[1
]}

FIERRO, JLG ^{[1
]}

机构：

[1] UNIV DUNDEE,DEPT CHEM,DUNDEE DD1 4HN,SCOTLAND

来源：

CHEMISTRY OF MATERIALS | 1995年 / 7卷 / 07期

关键词：

D O I：

10.1021/cm00055a011

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：

Titania-coated silica microspheres containing between 8 and 48 wt % TiO2 have been prepared by the homogeneous precipitation of TiC3 with a diluted ammonia solution up to a final pH close to 7. All these TiO2-SiO2 materials were physically characterized by X-ray diffraction, UV-visible reflectance, Raman, Fourier transform infrared, and photoelectron spectroscopic techniques. Calcination of the silica-supported precipitates leads to the formation of titanium dioxide. These TiO2 species are scattered on the surface as small crystals of anatase. Their structures become better defined as the titania loading increases. It was also observed that the TiO2-SiO2 oxides show much stronger acidic properties than the single TiO2 and SiO2 oxides. Bronsted acid sites appear to be associated with thee interface between octahedral titanium sites and silica. The infrared spectra of chemisorbed ammonia was very useful to charaterize acid properties in these materials.

引用

页码：1342 / 1348

页数：7

共 47 条

[1] SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH AMMONIA .2. MONOLAYERS OF VANADIA IMMOBILIZED ON TITANIA SILICA MIXED GELS [J].