Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis
<p> We study the optimization of the catalytic properties of entirely magnetic Co–Pt compact and mesoporous nanowires of different diameters (25–200 nm) by using magnetic actuation. The nanowires are a single-entity, robust, magnetic-catalyst with a huge catalytically-active surface...
| Authors: | ; ; ; ; ; |
|---|---|
| Format: | Article |
| Publication date: | 2017 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2072/305760 |
| Online Access: | http://hdl.handle.net/2072/305760 https://doi.org/10.1016/j.apcatb.2017.05.071 |
| Access Level: | Open access |
| Keyword: | Mesoporous magnetic nanowires Magnetically-actuated catalysis Water remediation Hydrogen production Catalyst recyclability |
| _version_ | 1878732775500021760 |
|---|---|
| author | Serra, Albert |
| author2 | Grau, Sergi Gimbert-Suriñach, Carolina Sort, Jordi Nogues, Josep Valles, Elisa |
| author2_role | author author author author author |
| author_browse | Gimbert-Suriñach, Carolina Grau, Sergi Nogues, Josep Serra, Albert Sort, Jordi Valles, Elisa |
| author_facet | Serra, Albert Grau, Sergi Gimbert-Suriñach, Carolina Sort, Jordi Nogues, Josep Valles, Elisa |
| author_role | author |
| collection | Recercat. Dipósit de la Recerca de Catalunya |
| description | <p> We study the optimization of the catalytic properties of entirely magnetic Co–Pt compact and mesoporous nanowires of different diameters (25–200 nm) by using magnetic actuation. The nanowires are a single-entity, robust, magnetic-catalyst with a huge catalytically-active surface area. We show that apart from conventional parameters, like the size and morphology of the nanowires, other factors can be optimized to enhance their catalytic activity. In particular, given the magnetic character of the nanowires, rotating magnetic fields are a very powerful approach to boost the performance of the catalyst. In particular, the magnetic field induces them to act as nano-stirrers, improving the local flow of material towards the active sites of the catalyst. We demonstrate the versatility of the procedure by optimizing (i) the degradation of different types of pollutants (4-nitrophenol and methylene blue) and (ii) hydrogen production. For example, by using as little as 0.1 mg mL−1 of 25 nm wide Co–Pt mesoporous nanowires (with ∼3 nm pore size) as catalysts, kinetic normalized constants <em>knor</em> as high as 20,667 and 21,750 s−1 g−1 for 4-nitrophenol and methylene blue reduction, respectively, are obtained. In addition, activity values for hydrogen production from borohydride are as high as 25.0 L H2 g−1 min−1, even at room temperature. These values outperform any current state-of-the-art proposed catalysis strategies for water remediation reactions by at least 10-times and are superior to most advanced approaches to generate hydrogen from borohydride. The recyclability of the nanowires together with the simplicity of the synthetic method makes this approach (using not only Co–Pt, but also other mesoporous magnetic catalysts) very appealing for very diverse types of catalytic applications.</p> <p> </p> |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_498967775db757fd99f3e814acc4e71e |
| institution | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| instname_str | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:recercat.cat:2072/305760 |
| publishDate | 2017 |
| publishDateSort | 2017 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| reponame_str | Recercat. Dipósit de la Recerca de Catalunya |
| spelling | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis Serra, Albert Grau, Sergi Gimbert-Suriñach, Carolina Sort, Jordi Nogues, Josep Valles, Elisa Mesoporous magnetic nanowires Magnetically-actuated catalysis Water remediation Hydrogen production Catalyst recyclability <p> We study the optimization of the catalytic properties of entirely magnetic Co–Pt compact and mesoporous nanowires of different diameters (25–200 nm) by using magnetic actuation. The nanowires are a single-entity, robust, magnetic-catalyst with a huge catalytically-active surface area. We show that apart from conventional parameters, like the size and morphology of the nanowires, other factors can be optimized to enhance their catalytic activity. In particular, given the magnetic character of the nanowires, rotating magnetic fields are a very powerful approach to boost the performance of the catalyst. In particular, the magnetic field induces them to act as nano-stirrers, improving the local flow of material towards the active sites of the catalyst. We demonstrate the versatility of the procedure by optimizing (i) the degradation of different types of pollutants (4-nitrophenol and methylene blue) and (ii) hydrogen production. For example, by using as little as 0.1 mg mL−1 of 25 nm wide Co–Pt mesoporous nanowires (with ∼3 nm pore size) as catalysts, kinetic normalized constants <em>knor</em> as high as 20,667 and 21,750 s−1 g−1 for 4-nitrophenol and methylene blue reduction, respectively, are obtained. In addition, activity values for hydrogen production from borohydride are as high as 25.0 L H2 g−1 min−1, even at room temperature. These values outperform any current state-of-the-art proposed catalysis strategies for water remediation reactions by at least 10-times and are superior to most advanced approaches to generate hydrogen from borohydride. The recyclability of the nanowires together with the simplicity of the synthetic method makes this approach (using not only Co–Pt, but also other mesoporous magnetic catalysts) very appealing for very diverse types of catalytic applications.</p> <p> </p> Elsevier http://hdl.handle.net/2072/305760 https://doi.org/10.1016/j.apcatb.2017.05.071 |
| spellingShingle | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis Serra, Albert Mesoporous magnetic nanowires Magnetically-actuated catalysis Water remediation Hydrogen production Catalyst recyclability |
| title | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
| title_full | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
| title_fullStr | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
| title_full_unstemmed | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
| title_short | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
| title_sort | Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
| topic | Mesoporous magnetic nanowires Magnetically-actuated catalysis Water remediation Hydrogen production Catalyst recyclability |
| topic_facet | Mesoporous magnetic nanowires Magnetically-actuated catalysis Water remediation Hydrogen production Catalyst recyclability |
| url | http://hdl.handle.net/2072/305760 https://doi.org/10.1016/j.apcatb.2017.05.071 |