n-Butylamine Adsorption onto Amorphous Silica

1972 ◽  
Vol 50 (6) ◽  
pp. 907-911 ◽  
Author(s):  
Colin Clark-Monks ◽  
Bryan Ellis
Keyword(s):  
Elevated Temperature ◽  
Reaction Mechanism ◽  
Ethylene Oxide ◽  
Hydroxyl Groups ◽  
Surface Groups ◽  
Vicinal Surface ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Strong Adsorption ◽  
Oxide Vapor

Gravimetric and infrared spectroscopic observations of n-butylamine adsorption onto silica have shown that strong adsorption is associated primarily with isolated surface hydroxyl groups and also with some vicinal surface groups. Adsorbed material can be totally removed from the surface by outgassing at elevated temperature (to 200 °C) without irreversible changes to the underlying surface. The interaction between adsorbed amine and ethylene oxide vapor has been investigated and a possible reaction mechanism is presented.

Role of the surface hydroxyl groups of modified titanium oxide in catalytic ethylene oxide hydration

2011 ◽  
Vol 52 (5) ◽  
pp. 659-671 ◽  
Author(s):  
D. E. Zavelev ◽  
M. V. Tsodikov ◽  
G. M. Zhidomirov ◽  
R. A. Kozlovskii
Keyword(s):  
Ethylene Oxide ◽  
Titanium Oxide ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

Controllable synthesis of phosphate-modified BiPO4 nanorods with high photocatalytic activity: surface hydroxyl groups concentrations effects

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 99712-99721 ◽  
Author(s):  
Yan Li ◽  
Yawen Wang ◽  
Yu Huang ◽  
Junji Cao ◽  
Wingkei Ho ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Hydroxyl Groups ◽  
Controllable Synthesis ◽  
Surface Hydroxyl ◽  
Methylene Orange ◽  
Surface Hydroxyl Groups

Surface modification by phosphate efficiently improves the photocatalytic performance of BiPO4 for the degradation of methylene orange (MO), by enhancing the concentration of surface hydroxyl groups and improving its hydrophilicity.

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