Acidic properties of silica—alumina gels as a function of chemical composition. Titration and catalytic activity measurements

1977 ◽  
Vol 73 (0) ◽  
pp. 372 ◽  
Author(s):  
Jean-Pierre Damon ◽  
Bernard Delmon ◽  
Jane-Marie Bonnier
Keyword(s):  
Catalytic Activity ◽  
Chemical Composition ◽  
Acidic Properties ◽  
Activity Measurements ◽  
Alumina Gels ◽  
Silica Alumina

scholarly journals Pore structure, acid property and catalytic activity of silica alumina gels prepared by various methods.

1989 ◽  
pp. 961-966 ◽  
Author(s):  
Hiroto HIRANO ◽  
Mitsuyasu HIRANUMA ◽  
Ken-ichi MUKAIDA ◽  
Haruo WATANABE
Keyword(s):  
Catalytic Activity ◽  
Pore Structure ◽  
Acid Property ◽  
Alumina Gels ◽  
Silica Alumina

Amorphous ferri-aluminosilicates in some tropical ferruginous soils

Clay Minerals ◽  
1976 ◽  
Vol 11 (2) ◽  
pp. 137-146 ◽  
Author(s):  
G. S. R. Krishna Murti ◽  
V. A. K. Sarma ◽  
P. Rengasamy
Keyword(s):  
Chemical Composition ◽  
Cation Exchange ◽  
Negative Correlation ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Molar Ratios ◽  
Silica Alumina ◽  
Fixation Capacity ◽  
Polymeric Component ◽  
Positively Charged

AbstractThe amorphous mineral selectively dissolved from the clay (<2 μm) fractions of twenty-six ferruginous soils contains considerable iron in addition to silicon and aluminium. SiO2/Al2O3 and SiO2/R2O3 molar ratios are between 2·03-3·52 and 1·72-2·95 respectively. The model of the amorphous ferri-aluminosilicate (AFAS) consists mainly of negatively charged tetrahedrally coordinated silica-alumina phase Si3AlO6(OH)4 containing domains of neutral FeOOH, with an outer positively charged hydroxyaluminium polymeric component [Al(OH)2.5]n.The calculated hydroxyl water content of the AFAS averages 17·8%; cation exchange capacity varies from 48·6 to 112·0 mEq/100 g and shows a negative correlation with the outer hydroxyaluminium octahedral component and a positive correlation with the ratio of the tetrahedral Si-Al component to the octahedral hydroxyaluminium component. The K-fixation capacity (1·9-6·1 mEq/100 g) of the AFAS does not appear to be related to the chemical composition. The genesis of the amorphous mineral is discussed.

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