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Yi D, Marcelot C, Romana I, Tassé M, Fazzini PF, Peres L, Ratel-Ramond N, Decorse P, Warot-Fonrose B, Viau G, Serp P, Soulantica K. Etching suppression as a means to Pt dendritic ultrathin nanosheets by seeded growth. NANOSCALE 2023; 15:1739-1753. [PMID: 36598381 DOI: 10.1039/d2nr05105b] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
2D ultrathin metal nanostructures are emerging materials displaying distinct physical and chemical properties compared to their analogues of different dimensionalities. Nanosheets of fcc metals are intriguing, as their crystal structure does not favour a 2D configuration. Thanks to their increased surface-to-volume ratios and the optimal exposure of low-coordinated sites, 2D metal nanostructures can be advantageously exploited in catalysis. Synthesis approaches to ultrathin nanosheets of pure platinum are scarce compared to other noble metals and to Pt-based alloys. Here, we present the selective synthesis of Pt ultrathin nansosheets by a simple seeded-growth method. The most crucial point in our approach is the selective synthesis of Pt seeds comprising planar defects, a main driving force for the 2D growth of metals with fcc structure. Defect engineering is employed here, not in order to disintegrate, but for conserving the defect comprising seeds. This is achieved by in situ elimination of the principal etching agent, chloride, which is present in the PtCl2 precursor. As a result of etching suppression, twinned nuclei, that are selectively formed during the early stage of nucleation, survive and grow to multipods comprising planar defects. Using the twinned multipods as seeds for the subsequent 2D overgrowth of Pt from Pt(acac)2 yields ultrathin dendritic nanosheets, in which the planar defects are conserved. Using phenylacetylene hydrogenation as a model reaction of selective hydrogenation, we compared the performance of Pt nanosheets to that of a commercial Pt/C catalyst. The Pt nanosheets show better stability and much higher selectivity to styrene than the commercial Pt/C catalyst for comparable activity.
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Affiliation(s)
- Deliang Yi
- Laboratoire de Physique et Chimie des Nano-Objets, UMR 5215 INSA, CNRS, UPS, Université de Toulouse, F-31077 Toulouse, France.
- LCC, CNRS-UPR 8241, ENSIACET, Université de Toulouse, 31030 Toulouse, France
| | - Cécile Marcelot
- CEMES-CNRS, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, 31055 Toulouse, France
| | - Idaline Romana
- LCC, CNRS-UPR 8241, ENSIACET, Université de Toulouse, 31030 Toulouse, France
| | - Marine Tassé
- Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse, France
| | - Pier-Francesco Fazzini
- Laboratoire de Physique et Chimie des Nano-Objets, UMR 5215 INSA, CNRS, UPS, Université de Toulouse, F-31077 Toulouse, France.
| | - Laurent Peres
- Laboratoire de Physique et Chimie des Nano-Objets, UMR 5215 INSA, CNRS, UPS, Université de Toulouse, F-31077 Toulouse, France.
| | - Nicolas Ratel-Ramond
- CEMES-CNRS, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, 31055 Toulouse, France
| | - Philippe Decorse
- ITODYS, UMR 7086, CNRS, Université de Paris, F-75013 Paris, France
| | | | - Guillaume Viau
- Laboratoire de Physique et Chimie des Nano-Objets, UMR 5215 INSA, CNRS, UPS, Université de Toulouse, F-31077 Toulouse, France.
| | - Philippe Serp
- LCC, CNRS-UPR 8241, ENSIACET, Université de Toulouse, 31030 Toulouse, France
| | - Katerina Soulantica
- Laboratoire de Physique et Chimie des Nano-Objets, UMR 5215 INSA, CNRS, UPS, Université de Toulouse, F-31077 Toulouse, France.
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Mente P, Mashindi V, Magubane A, Phaahlamohlaka TN, Gangatharan PM, Forbes RP, Coville NJ. Vapour phase hydrogenation of cinnamaldehyde using cobalt supported inside and outside hollow carbon spheres. CAN J CHEM 2022. [DOI: 10.1139/cjc-2021-0097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The hydrogenation of cinnamaldehyde is usually performed in the liquid phase in batch mode. In this study, a vapour phase flow system has been used to evaluate the use of cobalt catalysts supported inside and outside hollow carbon spheres (HCSs). The influence of temperature, hydrogen flow rate, and catalyst mass on the hydrogenation reaction was investigated. The catalysts generally showed modest conversion to the required products, hydrocinnamaldehyde, 3-phenyl propanol, cinnamyl alcohol, together with formation of various decomposition products. The data revealed that the Co@HCS showed better conversion and product selectivity compared with the Co/HCS. The catalysts with smaller particle sizes (ca. 6 nm) were more efficient than those with larger particles (30–40 nm). An increase in reaction temperature (200–300 °C) resulted in a lower cinnamaldehyde conversion and a poor product selectivity. TPR studies revealed that the Co@HCSs had a stronger metal-support interaction than the Co/HCSs catalysts. Catalyst recycling studies revealed that only the Co/HCSs could be regenerated (four cycles) and post reaction analysis of the catalysts revealed that this was due to HCS pore blockage and not Co sintering.
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Affiliation(s)
- Pumza Mente
- DSI-NRF Centre of Excellence in Strong Materials, Johannesburg 2000, South Africa
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Victor Mashindi
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Alice Magubane
- DSI-NRF Centre of Excellence in Strong Materials, Johannesburg 2000, South Africa
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Tumelo N. Phaahlamohlaka
- DSI-NRF Centre of Excellence in Catalysis, Pretoria 0001, South Africa
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Prakash M. Gangatharan
- DSI-NRF Centre of Excellence in Strong Materials, Johannesburg 2000, South Africa
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Roy P. Forbes
- DSI-NRF Centre of Excellence in Catalysis, Pretoria 0001, South Africa
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Neil J. Coville
- DSI-NRF Centre of Excellence in Strong Materials, Johannesburg 2000, South Africa
- DSI-NRF Centre of Excellence in Catalysis, Pretoria 0001, South Africa
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa
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Affiliation(s)
- Linfang Lu
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
| | - Shihui Zou
- Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Baizeng Fang
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC V6T 1Z3, Canada
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Yao W, Zhang N, Xiong R, Kankala RK, Liu Y, Wang S, Zhang X, McBreen PH. Highly-active platinum nanoparticle-encapsulated alumina-doped resorcinol–formaldehyde carbon composites for asymmetric hydrogenation. REACT CHEM ENG 2021. [DOI: 10.1039/d1re00068c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alumina-doped resorcinol–formaldehyde carbon supported Pt nanoparticles were synthesized and employed in asymmetric hydrogenation with high enantioselectivity, good reusability, and unprecedentedly high TOF.
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Affiliation(s)
- Wei Yao
- College of Chemical Engineering
- Huaqiao University
- Xiamen 361021
- P. R. China
| | - Na Zhang
- College of Chemical Engineering
- Huaqiao University
- Xiamen 361021
- P. R. China
| | - Renjie Xiong
- College of Chemical Engineering
- Huaqiao University
- Xiamen 361021
- P. R. China
| | | | - Yongjun Liu
- College of Chemical Engineering
- Huaqiao University
- Xiamen 361021
- P. R. China
| | - Shile Wang
- College of Chemical Engineering
- Huaqiao University
- Xiamen 361021
- P. R. China
| | - Xueqin Zhang
- College of Chemical Engineering
- Huaqiao University
- Xiamen 361021
- P. R. China
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