Preparation of Magnesia-Silica Oxides: Effect of Mg/Si Ratio and Sulfate on Acidity View Full Text


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Article Info

DATE

1997-01

AUTHORS

T. Lopez, M.E. Llanos, J. Navarrete, I. Schifter, P. Salas, R. Gomez

ABSTRACT

Mg-Si binary oxides were prepared by the sol-gel method, using magnesium diethoxide and tetraethoxysilane as starting materials. Mg-Si mixed oxides were prepared at pH3 and 9 at nominal concentrations of 1.3, 4.0, and 6.7 mole% MgO. Density and strength of the acid sites were determined by pyridine thermal programmed desorption. Comparable Lewis acidity was found in pH3 and 9 preparations. However, when the samples were sulfated with sulfuric acid, strong Bronsted acidity was developed, reaching a maximum at 6.7 mole% MgO. The strong acidity of sulfated samples was corroborated using the isopropanol decomposition reaction as catalytic test. Similar conversions are obtained at 100°C on sulfated samples, whereas 260°C are required for non-sulfated ones. More... »

PAGES

321-325

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1026487018502

DOI

http://dx.doi.org/10.1023/a:1026487018502

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1046838316


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