Influence of substrate structure on adsorption. II. Nitrogen and benzene adsorption on characterized silicas

Abstract

1557mental spectrum, and, the spurious peaks produced should not be confused with the real bands.A notable feature of the analysis is the rather large moduli of the cross-ring coupling constants; nonComputer Laboratory for his help. interconverting tetrasubstituted cyclobutanes6 have a modulus of about 1 cps for this type of coupling. The Also we wish to thank Mr. D. Collens of the University remaining magnitudes. (1966). constants are in signs and (6) C. H. Krauch, 5. Farid, and G . 0. Schenck, C h a . Ber., 99, 626

Evaluation of Surface Enthalpy of Porous Aluminosilicates of the MCM-41 Type Using Immersional Calorimetry: Effect of the Pore Size and Framework Si:Al Ratio

“…According to the results reported in the literature (16)(17)(18)(19), the concentration of surface hydroxyls on different alumina surfaces ranges between 1.3 and 8 OH nm −2 , whereas a fully hydrated smooth silica surface may reach a value of 4.6 OH nm −2 . Based on a close-packed hexagonal arrangement of hydroxyl groups, Peri (20) has evaluated the maximum density for 8 OH nm −2 on flat alumina.…”

Nitrogen adsorption on chemically modified silica gels

“…This indicates that the high energy adsorption sites eliminated were the hydroxyl groups on the surface. Whalen (21) represented the hydroxyl groups as being high energy nitrogen adsorption sites.…”

Interactions between surface hydroxyl groups and adsorbed molecules. I. The thermodynamics of benzene adsorption

“…There have been a number of studies concerned with the adsorption of aromatics on pure silicas. [4][5][6][7][8][9][10][11][12] Infrared spectroscopic9,11 or gravimetric6-8,12 methods were employed, but these two complementary techniques were rarely4 ,s used together. The adsorptions of various aromatics on porous glasses have also been examined13-21 (much of the work was reviewed by Little1), but these studies were not at all extensive.…”