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A study of a reduction of a micro- and nanometric bismuth oxide in hydrogen atmosphere

Abstract

A reduction of bismuth oxide in hydrogen atmosphere was investigated. The reaction was performed with a material in various structural forms: powder: with micrometric grains, powder with nanometric grains and powder pressed into pellets. The process was performed in both isothermal and non-isothermal conditions. An activation energy of the reaction calculated with Friedman method was found to be about 85 kJ/mol for the reduction of both micrometric powder and pellets. A model fitting analysis based on Coats-Redfern method suggests, that the reaction is limited by a diffusion of gaseous reactants, what is consistent with a structural analysis. An effect of liquid bismuth evaporation was noticed at the beginning of the process. This phenomenon was much stronger in the case of reduction of nanometric powder. The activation energy was estimated to be about 30 – 50 kJ/mol. The reaction could have been performed at lower temperature.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
THERMOCHIMICA ACTA no. 669, pages 99 - 108,
ISSN: 0040-6031
Language:
English
Publication year:
2018
Bibliographic description:
Trawiński B. J., Bochentyn B., Kusz B.: A study of a reduction of a micro- and nanometric bismuth oxide in hydrogen atmosphere// THERMOCHIMICA ACTA. -Vol. 669, (2018), s.99-108
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.tca.2018.09.010
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  29. FIGURE S5. Average activation energy -average correlation coefficient plot for different models of powder reduction; vertical lines mark an expected activation energy range 65-95 open in new tab
  30. kJ/mol; only models with av. correlation higher than 0.93 (17 from the group of 20) are shown FIGURE S6. Average activation energy -average correlation coefficient plot for different models of pellet reduction; vertical lines mark an expected activation energy range 65-105 open in new tab
  31. kJ/mol; only models with av. correlation higher than 0.93 (17 from the group of 20) are shown open in new tab
Sources of funding:
  • OPUS 11 umowa UMO-2016/21/B/ST8/03193
Verified by:
Gdańsk University of Technology

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