Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH 3 -SCO)

A recent development for selective ammonia oxidation into nitrogen and water vapor (NH -SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH ) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With th...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2021-10, Vol.26 (21), p.6461
Main Author: Jabłońska, Magdalena
Format: Article
Language:English
Subjects:
Ammonia
bifunctional catalysts
Catalysts
Catalytic activity
Catalytic oxidation
Core-shell structure
Emission standards
Gases
Gold
Low temperature
Metal oxides
Metals
NH3-SCO
Nitrogen
Nitrous oxide
Noble metals
Operating temperature
Oxidation
Palladium
Pollutants
Review
Reviews
Selectivity
Silver
supported oxides
Transition metals
Water vapor
Zeolites
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Summary:A recent development for selective ammonia oxidation into nitrogen and water vapor (NH -SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH ) 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 emissions is proposed, NH 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 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 conversion, high selectivity to N O and NO 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.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26216461