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Título: | Boron Compounds as Stabilizers of a Complex Microstructure in a Co-B-based Catalyst for NaBH4 Hydrolysis |
Autor: | Arzac, G.M. CSIC ORCID CVN; Rojas, T. Cristina; Fernández-Camacho, A. CSIC ORCID | Palabras clave: | Boron Cobalt Heterogeneous catalysis Hydrogen generation Nanoparticles |
Fecha de publicación: | 8-ago-2011 | Editor: | Wiley-VCH | Citación: | ChemCatChem 3(8): 1305-1313 (2011) | Resumen: | Co⋅B-based materials are widely used as catalysts for hydrogen generation through sodium borohydride self-decomposition. In the mid 1990 s, the aqueous and organic chemistry involved in Co⋅B synthesis and handling was studied. Nevertheless, the exact microstructure of these catalysts has remained unsolved. Herein we present an exhaustive study which shows a new and complete microstructural view of a Co⋅B-based material together with the chemistry of the cobalt and boron involved. By using nanoscale-resolution microscopy and spectroscopy techniques, we have elucidated the role of boron compounds as stabilizers in a complex microstructure, which also explains its high catalytic performance and long-term stability. The catalyst is proposed to be made up of 1–3 nm hcp Co0 nanoparticles embedded in amorphous CoxB (x=1, 2, 3), CoxOy, Co(BO2)2, and B2O3 phases alternatively or all together. All of these amorphous phases protect the nanocrystalline metallic core from growth and oxidation. | Descripción: | 9 páginas | Versión del editor: | http://dx.doi.org/10.1002/cctc.201100101 | URI: | http://hdl.handle.net/10261/56094 | DOI: | 10.1002/cctc.201100101 | E-ISSN: | 1867-3899 |
Aparece en las colecciones: | (ICMS) Artículos |
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