Metallic nanocatalysis : an accelerating seamless integration with nanotechnology
Rapidly growing research interests surround heterogeneous nanocatalysis, in which metal nanoparticles (NPs) play a pivotal role as structure-sensitive active centers. With advances in nanotechnology, the morphology of metal NPs can be precisely controlled, which can provide well-defined models of na...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Language: | English |
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2015
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| Online Access: | https://hdl.handle.net/10356/106584 http://hdl.handle.net/10220/24998 http://dx.doi.org/10.1002/smll.201400847 |
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| author | Dai, Yihu Wang, Ye Liu, Bin Yang, Yanhui |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Dai, Yihu Wang, Ye Liu, Bin Yang, Yanhui |
| author_sort | Dai, Yihu |
| collection | NTU |
| description | Rapidly growing research interests surround heterogeneous nanocatalysis, in which metal nanoparticles (NPs) play a pivotal role as structure-sensitive active centers. With advances in nanotechnology, the morphology of metal NPs can be precisely controlled, which can provide well-defined models of nanocatalysts for understanding and optimizing the structure–reactivity correlations and the catalytic mechanisms. Benefiting from this, further credible evidence can be acquired on well-defined nanocatalysts rather than common multiphase systems, which is of great significance for the design and practical application of active metal nanocatalysts. Numerous studies demonstrate that enhanced structure-sensitive catalytic activity and selectivity are dependent not only on an increased surface-to-volume ratio and special surface atom arrangements, but also on tailored metal–metal and metal–organic–ligand interfaces, which is ascribed to the size, shape, composition, and ligand effects. Size–reactivity relationships and underlying size-dependent metal–oxide interactions are observed in many reactions. For bimetallic nanocatalysts, the composition and nanostructure play critical roles in regulating reactivities. Crystal facets favor individual catalytic selectivity and rates via distinct reaction pathways occurring on diverse atomic arrangements, both to low-index and high-index facets. High-index facets exhibit superior reactivities owing to their high-energy active sites, which facilitate rapid bond-breaking and new bond generation. Additionally, organic ligands may enhance the catalytic activity and selectivity of metal nanocatalysts via changing the adsorption energies of reactants and/or reaction energy barriers. Furthermore, atomically dispersed metals, especially single-atom metallic catalysts, have emerged recently, which can achieve better specific catalytic activity compared to conventional nanostructured metallic catalysts due to the low-coordination environment, stronger interaction with supports, and maximum service efficiency. Here, recent progress in shaped metallic nanocatalysts is examined and several parameters are discussed, as well as finally highlighting single-atom metallic catalysts and some perspectives on nanocatalysis. The integration of nanotechnology and nanocatalysis has been shaping up and, no doubt, the combination of sensitive characterization techniques and quantum calculations will play more important roles in such processes. |
| first_indexed | 2024-10-01T03:15:55Z |
| format | Journal Article |
| id | ntu-10356/106584 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:15:55Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | ntu-10356/1065842019-12-06T22:14:34Z Metallic nanocatalysis : an accelerating seamless integration with nanotechnology Dai, Yihu Wang, Ye Liu, Bin Yang, Yanhui School of Chemical and Biomedical Engineering DRNTU::Science::Chemistry::Physical chemistry::Catalysis Rapidly growing research interests surround heterogeneous nanocatalysis, in which metal nanoparticles (NPs) play a pivotal role as structure-sensitive active centers. With advances in nanotechnology, the morphology of metal NPs can be precisely controlled, which can provide well-defined models of nanocatalysts for understanding and optimizing the structure–reactivity correlations and the catalytic mechanisms. Benefiting from this, further credible evidence can be acquired on well-defined nanocatalysts rather than common multiphase systems, which is of great significance for the design and practical application of active metal nanocatalysts. Numerous studies demonstrate that enhanced structure-sensitive catalytic activity and selectivity are dependent not only on an increased surface-to-volume ratio and special surface atom arrangements, but also on tailored metal–metal and metal–organic–ligand interfaces, which is ascribed to the size, shape, composition, and ligand effects. Size–reactivity relationships and underlying size-dependent metal–oxide interactions are observed in many reactions. For bimetallic nanocatalysts, the composition and nanostructure play critical roles in regulating reactivities. Crystal facets favor individual catalytic selectivity and rates via distinct reaction pathways occurring on diverse atomic arrangements, both to low-index and high-index facets. High-index facets exhibit superior reactivities owing to their high-energy active sites, which facilitate rapid bond-breaking and new bond generation. Additionally, organic ligands may enhance the catalytic activity and selectivity of metal nanocatalysts via changing the adsorption energies of reactants and/or reaction energy barriers. Furthermore, atomically dispersed metals, especially single-atom metallic catalysts, have emerged recently, which can achieve better specific catalytic activity compared to conventional nanostructured metallic catalysts due to the low-coordination environment, stronger interaction with supports, and maximum service efficiency. Here, recent progress in shaped metallic nanocatalysts is examined and several parameters are discussed, as well as finally highlighting single-atom metallic catalysts and some perspectives on nanocatalysis. The integration of nanotechnology and nanocatalysis has been shaping up and, no doubt, the combination of sensitive characterization techniques and quantum calculations will play more important roles in such processes. 2015-02-02T03:50:58Z 2019-12-06T22:14:34Z 2015-02-02T03:50:58Z 2019-12-06T22:14:34Z 2014 2014 Journal Article Dai, Y., Wang, Y., Liu, B., & Yang, Y. (2015). Metallic nanocatalysis : an accelerating seamless integration with nanotechnology. Small, 11(3), 268-289. 1613-6810 https://hdl.handle.net/10356/106584 http://hdl.handle.net/10220/24998 http://dx.doi.org/10.1002/smll.201400847 en Small © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| spellingShingle | DRNTU::Science::Chemistry::Physical chemistry::Catalysis Dai, Yihu Wang, Ye Liu, Bin Yang, Yanhui Metallic nanocatalysis : an accelerating seamless integration with nanotechnology |
| title | Metallic nanocatalysis : an accelerating seamless integration with nanotechnology |
| title_full | Metallic nanocatalysis : an accelerating seamless integration with nanotechnology |
| title_fullStr | Metallic nanocatalysis : an accelerating seamless integration with nanotechnology |
| title_full_unstemmed | Metallic nanocatalysis : an accelerating seamless integration with nanotechnology |
| title_short | Metallic nanocatalysis : an accelerating seamless integration with nanotechnology |
| title_sort | metallic nanocatalysis an accelerating seamless integration with nanotechnology |
| topic | DRNTU::Science::Chemistry::Physical chemistry::Catalysis |
| url | https://hdl.handle.net/10356/106584 http://hdl.handle.net/10220/24998 http://dx.doi.org/10.1002/smll.201400847 |
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