Infrared study of surface properties of .alpha.-chromia. IV. Pyridine and heavy water adsorption on oxygen-covered surface

1972 ◽  
Vol 76 (4) ◽  
pp. 571-577 ◽  
Author(s):  
A. Zecchina ◽  
E. Guglielminotti ◽  
L. Cerruti ◽  
S. Coluccia
Keyword(s):  
Surface Properties ◽  
Heavy Water ◽  
Water Adsorption ◽  
Infrared Study

Near-Infrared Study of Water Adsorption on Homo-Ionic Forms of Montmorillonite

2016 ◽  
Vol 64 (5) ◽  
pp. 571-585 ◽  
Author(s):  
Valéria Bizovská ◽  
Helena Pálková ◽  
Jana Madejová
Keyword(s):  
Water Adsorption ◽  
Near Infrared ◽  
Infrared Study ◽  
Ionic Forms

scholarly journals Effect of Water Adsorption on Cation-Surface Interaction Energy in the Na-Mordenite of 5.5 : 1 Si/Al Ratio

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Sekou Diaby
Keyword(s):  
Activation Energy ◽  
Surface Properties ◽  
Surface Potential ◽  
Water Adsorption ◽  
Adsorbed Water ◽  
Material Surface ◽  
Water Molecules ◽  
Zeolite Surface ◽  
Inner Surface ◽  
Insight Into

The mobility of the Na+cations localized at the inner surface of the studied mordenite zeolite depends on the material surface properties. In this work, we show that the activation energy,ΔEhop, relating to the Na+cation hopping displacement is associated to the surface potential and therefore can be used to get a better insight into the zeolite surface properties. Indeed, when molecules as water are adsorbed at the surface, they modify the surface potential energy and hence influence the value ofΔEhop. If the adsorbed molecules are polar they directly interact with the cations which become more mobile. The more theΔEhopvalue is, the less the amount of adsorbed water molecules is. Alterations of theΔEhopvalue with respect to the amount of adsorbed water molecules are interpreted using the Dubinin model which is based on simple adsorption principle.

Surface properties of Fe2O3-SiO2 mixed oxide and the activity for but-1-ene reaction

1982 ◽  
Vol 35 (5) ◽  
pp. 919 ◽  
Author(s):  
T Iizuka ◽  
H Tatsumi ◽  
K Tanabe
Keyword(s):  
Surface Properties ◽  
Oxidative Dehydrogenation ◽  
Mixed Oxide ◽  
Infrared Study ◽  
Ene Reaction ◽  
Isotope Tracer ◽  
Carbenium Ion ◽  
Intermediate Mechanism

The oxidative dehydrogenation and isomerization of but-1-ene were studied over Fe2O3-SiO2 catalysts of different composition. It was observed that the activity and selectivity to buta-1,3-diene increased markedly on adding a small amount of SiO2 to Fe2O3. To examine the activity and the mechanism of these reactions, an experiment with deuterium isotope tracer, as well as an infrared study, was carried out. On the basis of the results, it was concluded that the ally1 intermediate mechanism was operative for but-1-ene isomerization and buta-1,3-diene formation over Fe2O3-rich catalysts, and the carbenium ion mechanism was operative for but-1-ene isomerization over SO2-rich catalysts.

Surface properties of Ni(OH)2 and NiO. I. Water adsorption and heat of immersion of Ni(OH)2

1976 ◽  
Vol 55 (3) ◽  
pp. 540-545 ◽  
Author(s):  
F.J Micale ◽  
M Topić ◽  
C.L Cronan ◽  
H Leidheiser ◽  
A.C Zettlemoyer
Keyword(s):  
Surface Properties ◽  
Water Adsorption ◽  
Heat Of Immersion
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