Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO)
A recent development for selective ammonia oxidation into nitrogen and water vapor (NH<sub>3</sub>-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH<sub>3</sub>) can harm human health and the environment, it led to stringent regulations by en...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/21/6461 |
| _version_ | 1797511975718092800 |
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| author | Magdalena Jabłońska |
| author_facet | Magdalena Jabłońska |
| author_sort | Magdalena Jabłońska |
| collection | DOAJ |
| description | A recent development for selective ammonia oxidation into nitrogen and water vapor (NH<sub>3</sub>-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH<sub>3</sub>) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH<sub>3</sub> emissions is proposed, NH<sub>3</sub> emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH<sub>3</sub> oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH<sub>3</sub> conversion, high selectivity to N<sub>2</sub>O and NO<sub><i>x</i></sub> as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided. |
| first_indexed | 2024-03-10T05:55:32Z |
| format | Article |
| id | doaj.art-172104282c4b4beca3c0cc4586f5aa5b |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T05:55:32Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-172104282c4b4beca3c0cc4586f5aa5b2023-11-22T21:21:40ZengMDPI AGMolecules1420-30492021-10-012621646110.3390/molecules26216461Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO)Magdalena Jabłońska0Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, GermanyA recent development for selective ammonia oxidation into nitrogen and water vapor (NH<sub>3</sub>-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH<sub>3</sub>) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH<sub>3</sub> emissions is proposed, NH<sub>3</sub> emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH<sub>3</sub> oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH<sub>3</sub> conversion, high selectivity to N<sub>2</sub>O and NO<sub><i>x</i></sub> as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided.https://www.mdpi.com/1420-3049/26/21/6461noble metalssupported oxidesbifunctional catalystsNH<sub>3</sub>-SCO |
| spellingShingle | Magdalena Jabłońska Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO) Molecules noble metals supported oxides bifunctional catalysts NH<sub>3</sub>-SCO |
| title | Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO) |
| title_full | Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO) |
| title_fullStr | Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO) |
| title_full_unstemmed | Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO) |
| title_short | Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH<sub>3</sub>-SCO) |
| title_sort | progress on noble metal based catalysts dedicated to the selective catalytic ammonia oxidation into nitrogen and water vapor nh sub 3 sub sco |
| topic | noble metals supported oxides bifunctional catalysts NH<sub>3</sub>-SCO |
| url | https://www.mdpi.com/1420-3049/26/21/6461 |
| work_keys_str_mv | AT magdalenajabłonska progressonnoblemetalbasedcatalystsdedicatedtotheselectivecatalyticammoniaoxidationintonitrogenandwatervapornhsub3subsco |