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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 60  2001
Crystallization of Chromium Oxide Prepared by Sol-Gel Route
J. Radhakrishna, J. V. Dehadraya, S. K. Mukerjee, V. N. Vaidya and V. Venugopal
Pages : 71-73
DOI : 10.1080/0371750X.2001.10799970
Abstract
Chromia finds large applications as a catalyst base. The aim of the present investigation was to prepare chemically, mechanically and thermally stable porous Cr20 3 microspheres. Chromia microspheres (500-700 IJm} were prepared by internal gelation technique of the sol-gel process. These microspheres were dried in air at various temperatures between room temperature and aoo•c for further thermal studies in air I oxygen I argon. These gel microspheres were subjected to X-ray diffraction analysis (XRD) and thermal analysis. Crystallization of chromia takes place at 44o•c in air and at 11o•c in argon. It is reported that in air amorphous Cr(lll} oxide partially gets oxidized to Cr(VI) below aso•c and reduces back to Cr(lll} during crystallization. Maximum oxidation of about 30% could be achieved by heating chromia microspheres in pure oxygen at aoo•c. The present study deals with a probable mechanism for the crystallization of chromia in presence of Cr(VI).
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