US EPA

7854087 

Journal Article 

Acidity/basicity, electron donor properties and catalytic activity of sulphate modified ceria 

Sugunan, S; Seena, CRK 

1999 

1 

Indian Journal of Chemistry. Section A
ISSN: 0376-4710
EISSN: 0975-0975 

38 

11 

1123-1128 

English 

WOS:000084927400006 

The changes in surface acidity/basicity and catalytic activity of cerium oxide due to surface modification by sulphate ion have been investigated. Electron donor properties of both the modified and unmodified oxides have been studied using electron acceptors of various electron affinity values, viz. 7,7,8,8-tetracyanoquinodimethane, 2,3,5,6-tetrachloro-1,4-benzoquinone, p-dinitrobenzene and m-dinitrobenzene in order to find out whether the increase in acidity on suphation is due to the generation of new acidic sites or they are formed at the expense of some of the basic sites. The surface acidity/basicity has been determined using a set of Hammett indicators. The data have been correlated with the catalytic activity of the oxides for esterification of acetic acid using 1-butanol, reduction of cyclohexanone with 2- propanol and oxidation of cyclohexanol using benzophenone.