Sugunan, S; Devika Rani, G(Journal of Materials Science Letters, 1993)
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Abstract:
The electron donor properties of Nd2O3 activated at 300, 500 and 800°C were investigated
through studies on the adsorption of electron acceptors of various electron affinities - 7, 7, 8,8-tetracyanoquinodimethane (2.84 eV). 2, 3, 5, 6-tetrachloro-l , 4-benzoquinone (2.40 eV).
p-dinitrobenzene (1.77 eV), and m-dinitrobenzene (1.26 eV) in solvents acetonitrile and
1, 4-dioxan. The extent of electron transfer during adsorption has been found from magnetic
measurements and electronic spectral data. The corresponding data on mixed oxides of
neodymium and aluminium are reported for various. compositions. The acid-base properties of
catalysts were also determined using a set of Hammett indicators.
Sugunan, S; Devika Rani, G; Unnikrishnan, P A(Indian Journal of Engineering & Materials Sciences, October , 1995)
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Abstract:
Acid/base strength distribution of Y2O3 and its mixed
oxides with alumina catalysts are measured on Hammett
acidity function scale and expressed in terms of H0max
value. Basicity of Y2O3 increases with increase in activation
temperature and for mixed oxides the basicity increases
with increase in concentration of Y2O3, in the catalyst.