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Heat Treatment Improves the Activity and Water Tolerance of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation
[Image: see text] Ammonia selective catalytic oxidation (NH(3)-SCO) is a commercial technology applied to diesel vehicles to eliminate ammonia leakage. In this study, a series of Pt/Al(2)O(3) catalysts were synthesized by an impregnation method, and the state of Pt species was carefully adjusted by...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10116619/ https://www.ncbi.nlm.nih.gov/pubmed/37091366 http://dx.doi.org/10.1021/acsomega.3c00381 |
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author | Liu, Jianhua Xu, Guangyan An, Qi Wang, Yingjie Yu, Yunbo He, Hong |
author_facet | Liu, Jianhua Xu, Guangyan An, Qi Wang, Yingjie Yu, Yunbo He, Hong |
author_sort | Liu, Jianhua |
collection | PubMed |
description | [Image: see text] Ammonia selective catalytic oxidation (NH(3)-SCO) is a commercial technology applied to diesel vehicles to eliminate ammonia leakage. In this study, a series of Pt/Al(2)O(3) catalysts were synthesized by an impregnation method, and the state of Pt species was carefully adjusted by heat treatment. These Pt/Al(2)O(3) catalysts were further systematically characterized by Brunauer–Emmett–Teller, X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption fine structure, UV–vis, H(2)-tempertaure-programmed reduction, and NH(3)-temperature-programmed desorption. The characterization results showed that dispersed oxidized Pt species were present on conventional Pt/Al(2)O(3) samples, while high-temperature treatment induced the aggregation of platinum species to form metallic Pt nanoparticles. The Pt/Al(2)O(3) catalysts treated at high temperatures showed superior activity and water tolerance in the NH(3)-SCO reaction. Diffuse reflectance infrared Fourier-transform spectroscopy combined with mass spectrometry experiments revealed that the Lewis acid sites were more reactive than the Brønsted acid sites. Moreover, compared to oxidized Pt species, metallic Pt nanoparticles were beneficial for oxygen activation and were less affected by water vapor, thus contributing to the superior activity and water tolerance of Pt/Al-800. |
format | Online Article Text |
id | pubmed-10116619 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-101166192023-04-21 Heat Treatment Improves the Activity and Water Tolerance of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation Liu, Jianhua Xu, Guangyan An, Qi Wang, Yingjie Yu, Yunbo He, Hong ACS Omega [Image: see text] Ammonia selective catalytic oxidation (NH(3)-SCO) is a commercial technology applied to diesel vehicles to eliminate ammonia leakage. In this study, a series of Pt/Al(2)O(3) catalysts were synthesized by an impregnation method, and the state of Pt species was carefully adjusted by heat treatment. These Pt/Al(2)O(3) catalysts were further systematically characterized by Brunauer–Emmett–Teller, X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption fine structure, UV–vis, H(2)-tempertaure-programmed reduction, and NH(3)-temperature-programmed desorption. The characterization results showed that dispersed oxidized Pt species were present on conventional Pt/Al(2)O(3) samples, while high-temperature treatment induced the aggregation of platinum species to form metallic Pt nanoparticles. The Pt/Al(2)O(3) catalysts treated at high temperatures showed superior activity and water tolerance in the NH(3)-SCO reaction. Diffuse reflectance infrared Fourier-transform spectroscopy combined with mass spectrometry experiments revealed that the Lewis acid sites were more reactive than the Brønsted acid sites. Moreover, compared to oxidized Pt species, metallic Pt nanoparticles were beneficial for oxygen activation and were less affected by water vapor, thus contributing to the superior activity and water tolerance of Pt/Al-800. American Chemical Society 2023-04-06 /pmc/articles/PMC10116619/ /pubmed/37091366 http://dx.doi.org/10.1021/acsomega.3c00381 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Liu, Jianhua Xu, Guangyan An, Qi Wang, Yingjie Yu, Yunbo He, Hong Heat Treatment Improves the Activity and Water Tolerance of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation |
title | Heat Treatment
Improves the Activity and Water Tolerance
of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation |
title_full | Heat Treatment
Improves the Activity and Water Tolerance
of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation |
title_fullStr | Heat Treatment
Improves the Activity and Water Tolerance
of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation |
title_full_unstemmed | Heat Treatment
Improves the Activity and Water Tolerance
of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation |
title_short | Heat Treatment
Improves the Activity and Water Tolerance
of Pt/Al(2)O(3) Catalysts in Ammonia Catalytic Oxidation |
title_sort | heat treatment
improves the activity and water tolerance
of pt/al(2)o(3) catalysts in ammonia catalytic oxidation |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10116619/ https://www.ncbi.nlm.nih.gov/pubmed/37091366 http://dx.doi.org/10.1021/acsomega.3c00381 |
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