| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308825 |
| ISSN: | 0104-6632 |
| Autores: | Gheno, S.M1 Urquieta-González, E.A |
| Instituciones: | 1Universidade Federal de Sao Carlos, Departamento de Engenharia Quimica, Sao Carlos, Sao Paulo. Brasil |
| Año: | 2002 |
| Periodo: | Jul |
| Volumen: | 19 |
| Número: | 3 |
| Paginación: | 335-342 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | The conversion of n-butane to iso-butene on gallium/HZSM-5 catalysts at 350°C and WHSV=2.5h8-1 was studied. The catalysts were prepared by ion exchange from a Ga(NO3)2 solution and further submitted to calcination in air at 530°C. TEM analysis with an EDAX detector and TPR-H2 data showed that after calcination the Ga species were present mainly as Ga2O3, which are reduced to Ga2O at temperatures near 610°C. The specific acid activity (SAA) of the catalysts increased with the increase in aluminum content in the zeolite, and for a fixed Si/Al ratio, the SAA increased with Ga content. Values for specific hydro/dehydrogenation activity (SH/DHA) were significantly higher than those for SAA, indicating that the catalytic process is controlled by the kinetics on acid sites. Moreover, the production of iso-butene with a selectivity higher than 25% was a evidence that in gallium/HZSM-5-based catalysts the rate of the hydrogenation reaction is lower than that of the dehydrogenation reaction; this behavior confirmed the dehydrogenation nature of gallium species, thereby showing great promise for iso-butene production |
| Disciplinas: | Química |
| Palabras clave: | Ingeniería química, Conversión química, N-butano, Iso-buteno, Catalizadores, Galio, Zeolitas, Deshidrogenación, Isomerización |
| Keyword: | Chemistry, Chemical engineering, Chemical conversion, N-butane, Iso-butene, Catalysts, Gallium, Zeolites, Dehydrogenation, Isomerization |
| Texto completo: | Texto completo (Ver HTML) |
