Evolution of the acidic properties of silica—alumina gels as a function of chemical composition: infrared approach

1977 ◽  
Vol 73 (0) ◽  
pp. 359 ◽  
Author(s):  
Paul O. Scokart ◽  
Francois D. Declerck ◽  
Raymond E. Sempels ◽  
Paul G. Rouxhet
Keyword(s):  
Chemical Composition ◽  
Acidic Properties ◽  
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.

Silica-Alumina, Gels

1945 ◽  
Vol 37 (4) ◽  
pp. 327-331 ◽  
Author(s):  
P. B. Elkin ◽  
C. G. Shull ◽  
L. C. Roess
Keyword(s):  
Alumina Gels ◽  
Silica Alumina

Alteration of allophane and imogolite by alkaline digestion

Clay Minerals ◽  
1977 ◽  
Vol 12 (3) ◽  
pp. 195-198 ◽  
Author(s):  
V. C. Farmer ◽  
B. F. L. Smith ◽  
J. M. Tait
Keyword(s):  
Partial Solution ◽  
Selective Dissolution ◽  
Alkaline Digestion ◽  
Degree Of Dispersion ◽  
Alumina Gels ◽  
Silica Alumina ◽  
Reactive Silica

AbstractSince digestion of imogolite or allophane in 5% Na2CO3 at 95°C for periods of 2–100 h leads to solid products different in structure and composition from the starting materials, the procedure is unsuitable for selective dissolution of reactive silica-alumina gels from complex clay mixtures. Cold 5% Na2CO3 does not alter these clays, but effects partial solution, the extent of which depends on the degree of dispersion of the clay and the ratio of solids to solution.

Adsorption of Cyclic Hydrocarbons on Silica Alumina Gels in Natural Gas Processing

2017 ◽  
Vol 89 (7) ◽  
pp. 935-943 ◽  
Author(s):  
Frederik Berg ◽  
Christoph Pasel ◽  
Michael Luckas ◽  
Tobias Eckardt ◽  
Dieter Bathen
Keyword(s):  
Natural Gas ◽  
Cyclic Hydrocarbons ◽  
Gas Processing ◽  
Natural Gas Processing ◽  
Alumina Gels ◽  
Silica Alumina
Sign in / Sign up

Export Citation Format

Share Document