| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308955 |
| ISSN: | 0104-6632 |
| Autors: | Fontes, F.A.O1 Gomes, K.K.P Oliveira, S.A Souza, C.P Sousa, J.F |
| Institucions: | 1Universidade Federal do Rio Grande do Norte, Centro de Tecnologia, Natal, Rio Grande do Norte. Brasil |
| Any: | 2004 |
| Període: | Sep |
| Volum: | 21 |
| Número: | 3 |
| Paginació: | 393-403 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | A rotating cylinder reactor was designed for the synthesis of niobium carbide powders at 1173 K. Niobium carbide, NbC, was prepared by carbothermal reduction starting from commercial niobium pentoxide powders. The reactor was heated using a custom-made, two-part, hinged, electric furnace with programmable temperature control. The design and operational details of the reactor are presented. The longitudinal temperature gradient inside the reactor was determined. Total reaction time was monitored by a gas chromatograph equipped with an FID detector for determination of methane concentrations. The results show that time of reaction depended on rotation speed. NbC was also prepared in a static-bed alumina reactor using the same conditions as in the previous case. The niobium carbide powders were characterized by X-ray diffraction and compared with commercially available products. Morphological, particle size distribution and surface area analyses were obtained using SEM, LDPS and BET, respectively. Therefore, the present study offers a significant technological contribution to the synthesis of NbC powders in a rotating cylinder reactor |
| Disciplines | Química |
| Paraules clau: | Ingeniería química, Carburo de niobio, Reacción carbotérmica, Reactor de cilindro rotatorio, Metano |
| Keyword: | Chemistry, Chemical engineering, Niobium carbide, Carbothermal reaction, Rotating cylinder reactor, Methane |
| Text complet: | Texto completo (Ver HTML) |
