Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison
In this study, the temperature-dependent activity of Au/AC nanocatalysts in redox catalytic reactions was investigated. To this end, a series of colloidal gold catalysts supported on activated carbon and titania were prepared by the sol immobilization method employing polyvinyl alcohol as a polymeri...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-03-01
|
| Series: | Catalysts |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4344/12/3/323 |
| _version_ | 1797472451482877952 |
|---|---|
| author | Stefano Scurti Alessandro Allegri Francesca Liuzzi Elena Rodríguez-Aguado Juan Antonio Cecilia Stefania Albonetti Daniele Caretti Nikolaos Dimitratos |
| author_facet | Stefano Scurti Alessandro Allegri Francesca Liuzzi Elena Rodríguez-Aguado Juan Antonio Cecilia Stefania Albonetti Daniele Caretti Nikolaos Dimitratos |
| author_sort | Stefano Scurti |
| collection | DOAJ |
| description | In this study, the temperature-dependent activity of Au/AC nanocatalysts in redox catalytic reactions was investigated. To this end, a series of colloidal gold catalysts supported on activated carbon and titania were prepared by the sol immobilization method employing polyvinyl alcohol as a polymeric stabilizer at different hydrolysis degrees. The as-synthesized materials were widely characterized by spectroscopic analysis (XPS, XRD, and ATR-IR) as well as TEM microscopy and DLS/ELS measurements. Furthermore, 5-hydroxymethylfurfural (HMF) oxidation and 4-nitrophenol (4-NP) reduction were chosen to investigate the catalytic activity as a model reaction for biomass valorization and wastewater remediation. In particular, by fitting the hydrolysis degree with the kinetic data, volcano plots were obtained for both reactions, in which the maximum of the curves was represented relative to hydrolysis intermediate values. However, a comparison of the catalytic performance of the sample Au/AC_PVA-99 (hydrolysis degree of the polymer is 99%) in the two reactions showed a different catalytic behavior, probably due to the detachment of polymer derived from the different reaction temperature chosen between the two reactions. For this reason, several tests were carried out to investigate deeper the observed catalytic trend, focusing on studying the effect of the reaction temperature as well as the effect of support (metal–support interaction) by immobilizing Au colloidal nanoparticles on commercial titania. The kinetic data, combined with the characterization carried out on the catalysts, confirmed that changing the reaction conditions, the PVA behavior on the surface of the catalysts, and, therefore, the reaction outcome, is modified. |
| first_indexed | 2024-03-09T20:01:56Z |
| format | Article |
| id | doaj.art-7035ac2e79c548b191057c5b3e4564ab |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T20:01:56Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-7035ac2e79c548b191057c5b3e4564ab2023-11-24T00:42:54ZengMDPI AGCatalysts2073-43442022-03-0112332310.3390/catal12030323Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction ComparisonStefano Scurti0Alessandro Allegri1Francesca Liuzzi2Elena Rodríguez-Aguado3Juan Antonio Cecilia4Stefania Albonetti5Daniele Caretti6Nikolaos Dimitratos7Industrial Chemistry “Toso Montanari” Department, University of Bologna, Viale Risorgimento 4, 40136 Bologna, ItalyIndustrial Chemistry “Toso Montanari” Department, University of Bologna, Viale Risorgimento 4, 40136 Bologna, ItalyIndustrial Chemistry “Toso Montanari” Department, University of Bologna, Viale Risorgimento 4, 40136 Bologna, ItalyDepartamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, 29071 Málaga, SpainDepartamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, 29071 Málaga, SpainIndustrial Chemistry “Toso Montanari” Department, University of Bologna, Viale Risorgimento 4, 40136 Bologna, ItalyIndustrial Chemistry “Toso Montanari” Department, University of Bologna, Viale Risorgimento 4, 40136 Bologna, ItalyIndustrial Chemistry “Toso Montanari” Department, University of Bologna, Viale Risorgimento 4, 40136 Bologna, ItalyIn this study, the temperature-dependent activity of Au/AC nanocatalysts in redox catalytic reactions was investigated. To this end, a series of colloidal gold catalysts supported on activated carbon and titania were prepared by the sol immobilization method employing polyvinyl alcohol as a polymeric stabilizer at different hydrolysis degrees. The as-synthesized materials were widely characterized by spectroscopic analysis (XPS, XRD, and ATR-IR) as well as TEM microscopy and DLS/ELS measurements. Furthermore, 5-hydroxymethylfurfural (HMF) oxidation and 4-nitrophenol (4-NP) reduction were chosen to investigate the catalytic activity as a model reaction for biomass valorization and wastewater remediation. In particular, by fitting the hydrolysis degree with the kinetic data, volcano plots were obtained for both reactions, in which the maximum of the curves was represented relative to hydrolysis intermediate values. However, a comparison of the catalytic performance of the sample Au/AC_PVA-99 (hydrolysis degree of the polymer is 99%) in the two reactions showed a different catalytic behavior, probably due to the detachment of polymer derived from the different reaction temperature chosen between the two reactions. For this reason, several tests were carried out to investigate deeper the observed catalytic trend, focusing on studying the effect of the reaction temperature as well as the effect of support (metal–support interaction) by immobilizing Au colloidal nanoparticles on commercial titania. The kinetic data, combined with the characterization carried out on the catalysts, confirmed that changing the reaction conditions, the PVA behavior on the surface of the catalysts, and, therefore, the reaction outcome, is modified.https://www.mdpi.com/2073-4344/12/3/323gold colloidal nanoparticleshydrogenation of 4-nitrophenolHMF oxidationPVA hydrolysis degree |
| spellingShingle | Stefano Scurti Alessandro Allegri Francesca Liuzzi Elena Rodríguez-Aguado Juan Antonio Cecilia Stefania Albonetti Daniele Caretti Nikolaos Dimitratos Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison Catalysts gold colloidal nanoparticles hydrogenation of 4-nitrophenol HMF oxidation PVA hydrolysis degree |
| title | Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison |
| title_full | Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison |
| title_fullStr | Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison |
| title_full_unstemmed | Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison |
| title_short | Temperature-Dependent Activity of Gold Nanocatalysts Supported on Activated Carbon in Redox Catalytic Reactions: 5-Hydroxymethylfurfural Oxidation and 4-Nitrophenol Reduction Comparison |
| title_sort | temperature dependent activity of gold nanocatalysts supported on activated carbon in redox catalytic reactions 5 hydroxymethylfurfural oxidation and 4 nitrophenol reduction comparison |
| topic | gold colloidal nanoparticles hydrogenation of 4-nitrophenol HMF oxidation PVA hydrolysis degree |
| url | https://www.mdpi.com/2073-4344/12/3/323 |
| work_keys_str_mv | AT stefanoscurti temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT alessandroallegri temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT francescaliuzzi temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT elenarodriguezaguado temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT juanantoniocecilia temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT stefaniaalbonetti temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT danielecaretti temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison AT nikolaosdimitratos temperaturedependentactivityofgoldnanocatalystssupportedonactivatedcarboninredoxcatalyticreactions5hydroxymethylfurfuraloxidationand4nitrophenolreductioncomparison |