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Title: Distribution effect of the second phase in disperse silica/X oxides (X = Al{sub 2}O{sub 3}, TiO{sub 2}, GeO{sub 2}) on their surface properties

Abstract

Highly disperse oxides X/SiO{sub 2} (synthesized by using high-temperature hydrolysis of a SiCl{sub 4} and MCI{sub n} (M = Al, Ti) blend or chemical vapor deposition (CVD) technique for preparation of CVD-X (X = TiO{sub 2}, GeO{sub 2}) on a fumed silica substrate) were studied by means of {sup 1}H NMR, one-pass temperature-programmed desorption time-of-flight mass spectrometry (OPTPD-TOFMS), optical and photon correlations spectroscopies, electrophoresis, and quantum chemical methods. The nature and the concentration of the X phase (C{sub x}), its distribution in (or on) the silica matrix, and pretreatment conditions have a strong influence on the features of the X/SiO{sub 2} surfaces, e.g., type, concentration, and strength of active surface sites such as Broensted (B) and Lewis acid (L) sites. Also, these surface features affect the interaction of X/SiO{sub 2} with different adsorbates and other properties, which depend nonlinearly on the C{sub x} value and exhibit an extreme character.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Institute of Surface Chemistry, Kiev (UA)
OSTI Identifier:
20000514
Report Number(s):
CONF-9808111-
Journal ID: ISSN 0743-7463; LANGD5
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 15; Journal Issue: 18; Conference: Third international symposium on effects of surface heterogeneity in adsorption and catalysis on solids, Torun (PL), 08/09/1998--08/16/1998; Other Information: PBD: 31 Aug 1999; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON OXIDES; ALUMINIUM OXIDES; TITANIUM OXIDES; GERMANIUM OXIDES; PHASE STUDIES; SURFACE PROPERTIES; CATALYSTS; ADSORBENTS

Citation Formats

Gun'ko, V.M., Zarko, V.I., Turov, V.V., Leboda, R., and Chibowski, E. Distribution effect of the second phase in disperse silica/X oxides (X = Al{sub 2}O{sub 3}, TiO{sub 2}, GeO{sub 2}) on their surface properties. United States: N. p., 1999. Web. doi:10.1021/la981311e.
Gun'ko, V.M., Zarko, V.I., Turov, V.V., Leboda, R., & Chibowski, E. Distribution effect of the second phase in disperse silica/X oxides (X = Al{sub 2}O{sub 3}, TiO{sub 2}, GeO{sub 2}) on their surface properties. United States. doi:10.1021/la981311e.
Gun'ko, V.M., Zarko, V.I., Turov, V.V., Leboda, R., and Chibowski, E. Tue . "Distribution effect of the second phase in disperse silica/X oxides (X = Al{sub 2}O{sub 3}, TiO{sub 2}, GeO{sub 2}) on their surface properties". United States. doi:10.1021/la981311e.
@article{osti_20000514,
title = {Distribution effect of the second phase in disperse silica/X oxides (X = Al{sub 2}O{sub 3}, TiO{sub 2}, GeO{sub 2}) on their surface properties},
author = {Gun'ko, V.M. and Zarko, V.I. and Turov, V.V. and Leboda, R. and Chibowski, E.},
abstractNote = {Highly disperse oxides X/SiO{sub 2} (synthesized by using high-temperature hydrolysis of a SiCl{sub 4} and MCI{sub n} (M = Al, Ti) blend or chemical vapor deposition (CVD) technique for preparation of CVD-X (X = TiO{sub 2}, GeO{sub 2}) on a fumed silica substrate) were studied by means of {sup 1}H NMR, one-pass temperature-programmed desorption time-of-flight mass spectrometry (OPTPD-TOFMS), optical and photon correlations spectroscopies, electrophoresis, and quantum chemical methods. The nature and the concentration of the X phase (C{sub x}), its distribution in (or on) the silica matrix, and pretreatment conditions have a strong influence on the features of the X/SiO{sub 2} surfaces, e.g., type, concentration, and strength of active surface sites such as Broensted (B) and Lewis acid (L) sites. Also, these surface features affect the interaction of X/SiO{sub 2} with different adsorbates and other properties, which depend nonlinearly on the C{sub x} value and exhibit an extreme character.},
doi = {10.1021/la981311e},
journal = {Langmuir},
issn = {0743-7463},
number = 18,
volume = 15,
place = {United States},
year = {1999},
month = {8}
}