Determination of heats of aluminothermic redox reaction of V2O5 and MnO2

Sarangi, B.; Ray, H. S.; Tripathy, K.K.; Sarangi, A.

doi:10.1007/bf02636134

Cited by 5 publications

(10 citation statements)

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“…So, the reduced chromium reacts with the excess of aluminium leading to the formation of AlCr 2 . Sarangi et al 7) have observed in the case of the reduction of V 2 O 5 and MnO 2 with Al the formation of V-Al and Mn-Al intermetallic compounds, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Since the aluminothermic reduction of metal oxides is both highly exothermic and rapid reactions, there are few attempts to study the kinetics of such a process. [1][2][3][4] The aluminothermic reduction of Fe 2 O 3 , 5,6) MnO 2 6,7) and V 2 O 5 , 7) have been studied using the simultaneous DTA-TG technique. In a DTA apparatus the heat losses cannot be accurately predicted, therefore it is impossible to estimate precisely the maximum temperature attainable by aluminothermic reacting mixtures in a DTA set-up.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the Non-isothermal Reduction of Cr2O3 with Aluminium

2004

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The present paper presents the results of a thermoanalytical investigation on the kinetics of the aluminothermic reduction of Cr 2 O 3 under non-isothermal conditions. Simultaneous differential thermal analysis (DTA) and thermogravimetry (TG) technique were used. It was determined the minimum molar ratio Cr 2 O 3 : Al for the completion of the reaction and the value of the change of enthalpy associated to the reduction. X-ray diffraction was used in order to identify the products of reduction. Since the oxidation of aluminium and the reduction of Cr 2 O 3 occur simultaneously, it was possible to study the kinetics by analysing the rate of generation of the peak area for the Cr 2 O 3 reduction (DTA) and the mass gain due to the oxidation of some of the excess of aluminium (TG). The reduction was controlled by first order chemical reaction and the reduction was isokinetic within the experimental conditions of the present work.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of the Non-isothermal Reduction of Cr2O3 with Aluminium

2004

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“…The nonisothermal values of activation energy for aluminothermic reduction of the following oxides have been reported by the authors: [2,3,4] Table I summarizes these values, obtained using two separate approaches, namely, one by Coats and Redfern [5] and another by Dixit and Ray. [6] In each case, the nonisothermal values are extrapolated to describe a hypothetical situation of isothermal reduction (Figures 1 and 2).…”

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confidence: 94%

“…[1] With a view to investigating the coreduction route, a series of reduction studies involving hydrogen gas has been carried out in this laboratory. This includes the reductions of tungsten oxides [2] and some transition metal tungstates, namely, nickel tungstate, [3] cobalt tungstate, [4] and iron tungstate. [5] As a continuation of the previous investigations, the present work aims at a study of the reduction of NiWO 4 -FeWO 4 solid solutions, (Ni, Fe)WO 4 , by hydrogen.…”

mentioning

confidence: 99%

“…A considerable body of literature giving details of the experimental procedure and on the various aspects of the aluminothermic reduction of several transition metal oxides has been published by the authors. [2][3][4][5] In a DTA-TG setup, aluminothermic reduction, which is in fact a redox type of reaction, is triggered by the exothermic heat made available by oxidation of excess aluminum, which necessarily requires oxygen gas.…”

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confidence: 99%

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