IR spectroscopic insights into the coking-resistance effect of potassium on nickel-based catalyst during dry reforming of methane | DIGITAL.CSIC
- ️Odriozola, José Antonio
- ️Fri Oct 01 2021
Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/251396
COMPARTIR / EXPORTAR:
 |
Azancot, L., Bobadilla, L. F., Centeno, M. A., & Odriozola, J. A. (2021, May). IR spectroscopic insights into the coking-resistance effect of potassium on nickel-based catalyst during dry reforming of methane. Applied Catalysis B: Environmental. Elsevier BV. http://doi.org/10.1016/j.apcatb.2020.119822 |
| Título: | Autor: | ; Bobadilla, Luis F.; Centeno, Miguel Ángel CSIC ORCID; Odriozola, José Antonio CSIC ORCID | Financiadores: | Ministerio de Economía y Competitividad (España) | Palabras clave: | Dry reforming IR spectroscopy Ni-K interaction Coking-resistance effect |
Fecha de publicación: | 2021 | Editor: | Elsevier BV | Citación: | Applied Catalysis B: Environmental 285 (2021) | Resumen: | Dry reforming of methane (DRM) is an effective catalytic route for transforming CO and CH into valuable syngas and thus potentially attractive for mitigating the emission of environmental harmful gases. Therefore, it is crucial to develop rationally Ni-based catalysts highly resistant to coking and sintering. In this scenario, the addition of small amounts of potassium to nickel catalyst increases their resistance to coking during dry reforming of methane. Nonetheless, the specific role of potassium in these catalysts not have been fully understood and there are still important discrepancies between the different reported studies. This work provides a new approach on the anticoking nature of a K-promoted Ni catalyst by means of a combined IR spectroscopic study of in situ characterization by CO adsorption under static conditions and operando DRIFTS measurements under dynamic conditions of DRM reaction. The involved surface species formed during the reaction were elucidated by transient and steady-state operando DRIFTS studies. It was revealed that the existence of Ni-K interfacial sites favours the gasification of carbonaceous deposits towards reverse Boudouard reaction and reduces the sticking probability of CO dissociative adsorption. Moreover, the presence of strongly Mg-O-K basic sites leads to the formation of carbonate intermediates that are subsequently reduced into CO gaseous towards the associative mechanism by RWGS reaction. These results provide a fundamental understanding of the relevant anticoking effect of potassium on Ni-based catalysts. | Versión del editor: | http://dx.doi.org/10.1016/j.apcatb.2020.119822 | URI: | http://hdl.handle.net/10261/251396 | DOI: | 10.1016/j.apcatb.2020.119822 | Identificadores: | doi: 10.1016/j.apcatb.2020.119822 issn: 0926-3373 |
| Aparece en las colecciones: | (ICMS) Artículos |
Ficheros en este ítem:
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.