Sugunan, S; Sherly, K B(Indian Journal of Chemistry, August , 1993)
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Abstract:
The electron donating properties of La2O3 activated at 300, 500 and 800·C and its mixed oxides with
alumina are reported from the studies on adsorption of electron acceptors of varying electron affinity on
La203. The electron acceptors with their electron affinity values given in parenthesis are:
7,7,8,8-tetracyanoquinodimethane (2.84 eV), 2,3,5,6-tetrachloro-I,4-benzoquinone (2.40 eV) and
p-dinitrobenzene(l.77eV). The basicity of the oxide has been determined by titration with n-butylamine and
Ho.max values are reported. The limit of electron transfer from the oxide to the electron acceptor is between
2.40 and 1.77 eV. It is observed that La203 promotes the surface electron properties of alumina without
changing its limit of electron transfer.
Sugunan, S; Jalaja, J M(Indian Journal of Chemistry, March , 1995)
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Abstract:
The electron donating properties of Ce02 and its mixed
oxides with alumina have been determined from the studies
of adsorption of electron acceptors of various electron
affinities on the surface of these oxides. The catalytic
activity of these oxides towards some reactions such as
oxidation of alcohols and reduction of ketones have been
Correlated with their surface electrondonor properties. The
surface acidity/basicity of these oxides have also been
determined by titration method using a set of Hammett
indicators.