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Evaluation of the Acidity of Pillared Montmorillonites by Pyridine Adsorption
Acidity Al-Pillared Montmorillonite Mesoporous Materials Pyridine Adsorption Zr-Pillared Montmorillonite
2011/12/6
Abstract: Two series of pillared clays were prepared from a purified montmorillonite (95%) from La Serrata of Nijar, Spain, and polycations of Al and Zr using various methods. The effect of both the p...
Effects of Acidity on the Hydrothermal Synthesis of Kaolinite from Silica-Gel and Gibbsite
Crystallite size Crystallization Hydrothermal synthesis Kaolinite pH Stacking fault
2011/12/27
Abstract: A comparative study is reported in which kaolinite has been hydrothermally synthesized at several pH conditions. The syntheses were carried out at 220 亱C for 3 to 10 d with distilled water o...
Acidity of Montmorillonite-(Ce or Zr) Phosphate Cross-linked Compounds
Layered phosphates Montmorillonite Surface acidity
2011/12/28
The nature and number of acid sites per unit weight on a series of materials obtained by interaction of a montmorillonite with zirconium or cerium hydrogenphosphates precipitated in situ by reaction b...
Study of the Nature of Acid Sites of Montmorillonites Pillared with Aluminium and Oligosilsesquioxane Complex Cations. 1. Bronsted Acidity
Bronsted acidity Diffuse reflectance IR-spectroseopy Montmorillonites Pillared clays
2011/12/29
Two samples, obtained by pillaring a Wyoming montmorillonite with hydroxy aluminium and oligosilsesquioxane cations, were studied by stepwise thermal desorption of ammonia and by highly sensitive diff...
Surface Acidity of Palygorskite-Supported Rhodium Catalysts
Pyridine Catalysis Palygorskite Rhodium Surface acidity
2012/1/4
Infrared spectra of adsorbed pyridine have been used to obtain qualitative information on the nature of the interaction of pyridine with different rhodium catalysts supported on palygorskite and silic...
SURFACE ACIDITY OF PALYGORSKITE-SUPPORTED RHODIUM CATALYSTS
Pyridine Catalysis Palygorskite Rhodium Surface acidity
2011/11/14
Infrared spectra of adsorbed pyridine have been used to obtain qualitative information on the nature of the interaction of pyridine with different rhodium catalysts supported on palygorskite and silic...
Infrared Studies of Surface Acidity and Reversible Folding in Palygorskite
Infrared spectroscopy Lewis-acid sites Palygorskite Protonation Pyridine
2012/1/9
The infrared absorption spectra of a palygorskite sample from Cáceres, Spain, showed two previously unreported bands in the OH-stretching region at 3420–3440 and 3220–3230 cm−1 after evacuation ...
INFRARED STUDIES OF SURFACE ACIDITY AND REVERSIBLE FOLDING IN PALYGORSKITE
Infrared spectroscopy Lewis-acid sites Palygorskite Protonation Pyridine
2011/11/14
The infrared absorption spectra of a palygorskite sample from Cficeres, Spain, showed two previously unreported bands in the OH-stretching region at 3420-3440 and 3220-3230 cm -~ after evacuation at 9...
An Ultraviolet Spectroscopic Method for Monitoring Surface Acidity of Clay Minerals under Varying Water Content
Monitoring Surface Clay Minerals Varying Water Content
2012/2/15
The ability of a clay mineral surface to function as an acid is not represented by bulk pH measurements. A method using u.v. analysis and organic indicators has been developed to monitor surface acidi...
Effect of Acidity in Montmorillonite Interlayers on the Sorption of Aniline Derivatives
Acidity Montmorillonite Interlayers Sorption Aniline Derivatives
2012/2/21
Sorption of aniline and its derivatives by montmorillonite substituted by cations of widely different acidity depends upon the polarizing power of the interlayer cations. Infra-red spectra indicate th...
Surface Acidity of Smectites in Relation to Hydration, Exchangeable Cation, and Structure
Surface Acidity Smectites Hydration Exchangeable Cation Structure
2012/2/21
Equilibrium studies on clay films exposed to NH3 and H2O vapors demonstrate the effect of exchangeable cations on surface acidity and its relationship to hydration. At a relative humidity of 98 per ce...