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Infantes-Molina A, Villanova A, Talon A, Kohan MG, Gradone A, Mazzaro R, Morandi V, Vomiero A, Moretti E. Au-Decorated Ce-Ti Mixed Oxides for Efficient CO Preferential Photooxidation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:38019-38030. [PMID: 32687700 PMCID: PMC7458359 DOI: 10.1021/acsami.0c08258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
We investigated the photocatalytic behavior of gold nanoparticles supported on CeO2-TiO2 nanostructured matrixes in the CO preferential oxidation in H2-rich stream (photo-CO-PROX), by modifying the electronic band structure of ceria through addition of titania and making it more suitable for interacting with free electrons excited in gold nanoparticles through surface plasmon resonance. CeO2 samples with different TiO2 concentrations (0-20 wt %) were prepared through a slow coprecipitation method in alkaline conditions. The synthetic route is surfactant-free and environmentally friendly. Au nanoparticles (<1.0 wt % loading) were deposited on the surface of the CeO2-TiO2 oxides by deposition-precipitation. A benchmarking sample was also considered, prepared by standard fast coprecipitation, to assess how a peculiar morphology can affect the photocatalytic behavior. The samples appeared organized in a hierarchical needle-like structure, with different morphologies depending on the Ti content and preparation method, with homogeneously distributed Au nanoparticles decorating the Ce-Ti mixed oxides. The morphology influences the preferential photooxidation of CO to CO2 in excess of H2 under simulated solar light irradiation at room temperature and atmospheric pressure. The Au/CeO2-TiO2 systems exhibit much higher activity compared to a benchmark sample with a non-organized structure. The most efficient sample exhibited CO conversions of 52.9 and 80.2%, and CO2 selectivities equal to 95.3 and 59.4%, in the dark and under simulated sunlight, respectively. A clear morphology-functionality correlation was found in our systematic analysis, with CO conversion maximized for a TiO2 content equal to 15 wt %. The outcomes of this study are significant advancements toward the development of an effective strategy for exploitation of hydrogen as a viable clean fuel in stationary, automotive, and portable power generators.
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Affiliation(s)
- Antonia Infantes-Molina
- Departamento
de Química Inorgánica, Cristalografía y Mineralogía
(Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain
| | - Andrea Villanova
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, Via Torino 155, 30172 Mestre Venezia, Italy
| | - Aldo Talon
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, Via Torino 155, 30172 Mestre Venezia, Italy
| | - Mojtaba Gilzad Kohan
- Division
of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - Alessandro Gradone
- CNR-IMM
Bologna Section, Via
Piero Gobetti 101, 40129 Bologna, Italy
- Chemistry
Department “Giacomo Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
| | - Raffaello Mazzaro
- CNR-IMM
Bologna Section, Via
Piero Gobetti 101, 40129 Bologna, Italy
| | - Vittorio Morandi
- CNR-IMM
Bologna Section, Via
Piero Gobetti 101, 40129 Bologna, Italy
| | - Alberto Vomiero
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, Via Torino 155, 30172 Mestre Venezia, Italy
- Division
of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, 97187 Luleå, Sweden
| | - Elisa Moretti
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, Via Torino 155, 30172 Mestre Venezia, Italy
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Barroso-Martín I, Infantes-Molina A, Talon A, Storaro L, Rodríguez-Aguado E, Rodríguez-Castellón E, Moretti E. CO Preferential Photo-Oxidation in Excess of Hydrogen in Dark and Simulated Solar Light Irradiation over AuCu-Based Catalysts on SBA-15 Mesoporous Silica-Titania. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1203. [PMID: 30011796 PMCID: PMC6073442 DOI: 10.3390/ma11071203] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 06/26/2018] [Accepted: 07/10/2018] [Indexed: 12/13/2022]
Abstract
In this work, SBA-15 silica and silica-titania have been used as supports for photocatalysts based on AuCu alloy (Au:Cu = 1) to be used in the preferential oxidation of CO (CO-PROX) in excess of hydrogen at room temperature and atmospheric pressure both in the dark and under simulated solar light irradiation. To study their textural, structural, chemical and optical properties, the samples were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), adsorption-desorption of N₂ at -196 °C, 13C and 29Si solid state nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance ultraviolet-visible (DRUV-vis) spectroscopy. Titanium was present mainly in the form of titania aggregates, but also as small particles interacting with the SBA support. In both catalysts, the metal alloy nanoparticles displayed an average size of 4 nm as demonstrated by TEM measurements. AuCu/Ti-SBA turned out to be photoactive and selective in the photo-CO-PROX reaction showing the highest activity, with conversion and selectivity towards CO₂ of 80%, due both to the presence of titania incorporated in SBA-15 and to the synergistic effect of Cu when alloyed with Au.
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Affiliation(s)
- Isabel Barroso-Martín
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
| | - Antonia Infantes-Molina
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
| | - Aldo Talon
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, National Interuniversity Consortium of Materials Science and Technology (INSTM) Venice Research Unit, Via Torino 155/B, Mestre, 30172 Venezia, Italy.
| | - Loretta Storaro
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, National Interuniversity Consortium of Materials Science and Technology (INSTM) Venice Research Unit, Via Torino 155/B, Mestre, 30172 Venezia, Italy.
| | - Elena Rodríguez-Aguado
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
| | - Enrique Rodríguez-Castellón
- Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
| | - Elisa Moretti
- Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia, National Interuniversity Consortium of Materials Science and Technology (INSTM) Venice Research Unit, Via Torino 155/B, Mestre, 30172 Venezia, Italy.
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Abstract
Despite of the huge number of papers about the catalytic preferential oxidation of CO (CO-PROX) for the purification of H2 streams, there is still a need for more effective catalysts in order to reduce the large required catalyst volume of CO-PROX unity. In this work, large surface area nanometric ceria was used as support for CuO/CeO2 catalysts with CuO load up to 10 wt % easily dispersed by wet impregnation. Catalysts were characterized by ICP-MS, XRD, SEM/EDS, N2 physisorption, H2 temperature programmed reduction (TPR), and CO2 temperature programmed desorption (TPD) and tested under different reaction conditions (including under feed containing inhibiting species such as CO2 and H2O). Catalytic tests revealed that our samples show high activity and selectivity even under stringent reaction conditions; moreover, they result among the most active catalysts when compared to those reported in the scientific literature. The high activity can be related to the enhanced amount of highly dispersed copper sites in strong interaction with ceria related to the nature of the nanometric support, as evidenced by the characterization techniques. Despite the high concentration of active copper sites, catalytic performance is limited by CO2 desorption from ceria in the neighborhood of copper sites, which prevents a further improvement. This suggests that new catalyst formulations should also provide a lower affinity towards CO2.
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Sustainable photo-assisted CO oxidation in H 2 -rich stream by simulated solar light response of Au nanoparticles supported on TiO 2. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.09.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Jiang Z, Chen C, Ma M, Guo Z, Yu Y, He C. Rare-earth element doping-promoted toluene low-temperature combustion over mesostructured CuMCeOx (M = Y, Eu, Ho, and Sm) catalysts: the indispensable role of in situ generated oxygen vacancies. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01849a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synergetic effect between Ho and the CuCeOx framework creates abundant active oxygen vacancies and significantly enhances the toluene destruction activity.
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Affiliation(s)
- Zeyu Jiang
- Department of Environmental Science and Engineering
- State Key Laboratory of Multiphase Flow in Power Engineering
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
| | - Changwei Chen
- Department of Environmental Science and Engineering
- State Key Laboratory of Multiphase Flow in Power Engineering
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
| | - Mudi Ma
- Department of Environmental Science and Engineering
- State Key Laboratory of Multiphase Flow in Power Engineering
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
| | - Zheng Guo
- Department of Environmental Science and Engineering
- State Key Laboratory of Multiphase Flow in Power Engineering
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
| | - Yanke Yu
- Department of Environmental Science and Engineering
- State Key Laboratory of Multiphase Flow in Power Engineering
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
| | - Chi He
- Department of Environmental Science and Engineering
- State Key Laboratory of Multiphase Flow in Power Engineering
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
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Total Oxidation of Propane Using CeO2 and CuO-CeO2 Catalysts Prepared Using Templates of Different Nature. Catalysts 2017. [DOI: 10.3390/catal7040096] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Cecilia JA, Arango-Díaz A, Rico-Pérez V, Bueno-López A, Rodríguez-Castellón E. The influence of promoters (Zr, La, Tb, Pr) on the catalytic performance of CuO-CeO2 systems for the preferential oxidation of CO in the presence of CO2 and H2O. Catal Today 2015. [DOI: 10.1016/j.cattod.2015.02.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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CuO-CeO2 supported on montmorillonite-derived porous clay heterostructures (PCH) for preferential CO oxidation in H2-rich stream. Catal Today 2015. [DOI: 10.1016/j.cattod.2015.01.040] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Liu Y, Liu B, Wang Q, Li C, Hu W, Liu Y, Jing P, Zhao W, Zhang J. Three-dimensionally ordered macroporous Au/CeO2–Co3O4 catalysts with mesoporous walls for enhanced CO preferential oxidation in H2-rich gases. J Catal 2012. [DOI: 10.1016/j.jcat.2012.09.003] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Veselovskyi VL, Ischenko EV, Gayday SV, Lisnyak VV. A high efficient two phase CuO/Cu2(OH)3NO3(Co2+/Fe3+) composite catalyst for CO-PROX reaction. CATAL COMMUN 2012. [DOI: 10.1016/j.catcom.2011.11.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Influence of pH values in the preparation of CuO-CeO2 on its catalytic performance for the preferential oxidation of CO in excess hydrogen. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/s1003-9953(09)60063-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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