Production Of Nbc from Nb2O5 in a rotating cylinder reactor: Kinetic study of reduction/carburization reactions
| Autor: | M. B. D. Bezerra, Francisco de Assis Oliveira Fontes, J. F. de Sousa, Carlson Pereira de Souza, M. Benachour |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Work (thermodynamics)
Chemistry General Chemical Engineering Nucleation Thermodynamics General Chemistry Kinetic energy Industrial and Manufacturing Engineering Isothermal process Cylinder (engine) law.invention chemistry.chemical_compound law Phase (matter) Environmental Chemistry Niobium carbide Stoichiometry |
| Zdroj: | Chemical Engineering Journal. 175:534-538 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2011.09.105 |
| Popis: | The present work aims at a kinetic model for converting NbO 2 into NbC in the isothermal region of the second reduction/carburization reaction. The model presented for the solid phase was based on the variation of the mass obtained for experiments with reactions interrupted at different times and processed at temperatures of 1148, 1173 and 1223 K. The reaction took place in a rotating cylinder reactor, with rotation velocity of 5 rpm, gas phase flow of 4.033 × 10 6 m 3 /s and initial mass of Nb 2 O 5 0.004 kg (nominal). The conversion of NbO 2 was found from the mass balances performed based on the set of stoichiometric equations of the reduction/carburization of Nb 2 O 5 into NbC and used to validate the nucleation model using two parameters ( N , M ) which indicate, respectively, the tridimensional growth of the nuclei formed and a fourfold increase in the growth velocity of the nuclei. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect