Издательство СО РАН

Издательство СО РАН

Адрес Издательства СО РАН: Россия, 630090, а/я 187
Новосибирск, Морской пр., 2

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Яндекс.Метрика

Поиск по журналу

Химия в интересах устойчивого развития

2005 год, номер 2

Synthesis of Cr2(MoO4)3 from Mechanically Activated Precursors

D. Klissurski1, M. Mancheva1, R. Iordanova1 and B. Kunev2
1Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences,
G. Bonchev str., bl.11, Sofia 1113 (Bulgaria), E-mail: dklis@igic.bas.bg; E-mail: mi720@abv.bg
2Institute of Catalysis, Bulgarian Academy of Sciences, G. Bonchev str., bl.11, Sofia 1113 (Bulgaria)
Страницы: 229-232

Аннотация

The effect of mechanical activation on the synthesis of Cr2(MoO4)3 is Studied.
Its formation was monitored by X-ray diffraction (XRD) and infrared spectroscopy (IR). Shape and size of the product particles were studied by scanning electron microscopy (SEM). The compound studied presents a special interest as a catalyst for mild oxidation of alcohols. A stoichiometric mixture of Cr(OH)3 and MoO3 in a 2:3 molar ratio was subjected to intense mechanical treatment in a planetary ball mill (Fritsch-7) for different periods of time, followed by calcination at various temperatures. The 2.5 h milling produced broadening and decrease in the intensity of the MoO3 XRD peaks, while the principle peaks of Cr2O3 appeared. Further milling (5 h) resulted in complete amorphization of the reagent mixture. IR spectroscopic analysis indicated occurrence of structural transformation in the mixture of solid reagents during the mechanical activation. These phase and structural changes are a precondition for a drastic decrease in the temperature of classical solid state synthesis of Cr2(MoO4)3 from 700 to 400oC.