SiO2 supported Cr2O3 catalysts with varying Cr content have been prepared a
nd are characterized by nitrogen adsorption, low temperature oxygen chemiso
rption (LTOC), X-ray diffraction (XRD) and electron spin resonance (ESR) te
chniques. Aromatization of isophorone is carried out on these catalysts. A
good correlation obtained between the oxygen uptake and aromatization yield
helped to identify the nature of the active species. (C) 2000 Elsevier Sci
ence B.V. All rights reserved.