| Revista: | Brazilian journal of chemical engineering |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000308986 |
| ISSN: | 0104-6632 |
| Autors: | Batista, M.S1 Wallau, M Urquieta-González, E.A |
| Institucions: | 1Universidade Federal de Sao Carlos, Departamento de Engenharia Quimica, Sao Carlos, Sao Paulo. Brasil |
| Any: | 2005 |
| Període: | Sep |
| Volum: | 22 |
| Número: | 3 |
| Paginació: | 341-351 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, aplicado |
| Resumen en inglés | Fe-ZSM-5 catalysts were prepared by ion exchange in aqueous medium or in the solid state and tested in the catalytic reduction of NO with iso-butane. X-ray powder diffraction (XRD), atomic absorption spectroscopy (AAS), electron paramagnetic resonance spectroscopy (EPR), X-ray absorption spectroscopy (XANES, EXAFS), temperature-programmed reduction by H2 (H2-TPR) and Mössbauer spectroscopy (MÖS-S) were used for sample characterisation. Irrespective of the method used in catalyst preparation, EPR, XANES and MÖS-S showed Fe atoms in the oxidation state of 3+. MÖS-S and H2-TPR data on Fe-ZSM-5 prepared by ion exchange in the solid state allowed quantification of a lower hematite (Fe2O3) concentration and a higher proportion of Fe cations than samples prepared in an aqueous medium. In all the catalysts studied these Fe cations were the active sites in the reduction of NO to N2 and in the oxidation of iso-butane. It is further suggested that coordination of Fe species is another important aspect to be considered in their behaviour |
| Disciplines | Química |
| Paraules clau: | Ingeniería química, Oxido nitroso, Reducción catalítica selectiva, Catalizadores, Iso-butano, Espectroscopía Mossbauer |
| Keyword: | Chemistry, Chemical engineering, Nitrous oxide, Selective catalytic reduction, Catalysts, Iso-butane, Mossbauer spectroscopy |
| Text complet: | Texto completo (Ver HTML) |
