Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation

Abstract New convenient wet-chemistry synthetic routes have made it possible to explore catalytic activities of a variety of single supported atoms, however, the single supported atoms on inert substrates (e.g. alumina) are limited to adatoms and cations of Pt, Pd, and Ru. Previously, we have found...

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Autores principales:	Chaitanya K. Narula, Lawrence F. Allard, Melanie Moses-DeBusk, G. Malcom Stocks, Zili Wu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cbbea0ea038049568cfd687b623ffdb4
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spelling	oai:doaj.org-article:cbbea0ea038049568cfd687b623ffdb42021-12-02T15:05:55ZSingle Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation10.1038/s41598-017-00577-y2045-2322https://doaj.org/article/cbbea0ea038049568cfd687b623ffdb42017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00577-yhttps://doaj.org/toc/2045-2322Abstract New convenient wet-chemistry synthetic routes have made it possible to explore catalytic activities of a variety of single supported atoms, however, the single supported atoms on inert substrates (e.g. alumina) are limited to adatoms and cations of Pt, Pd, and Ru. Previously, we have found that single supported Pt atoms are remarkable NO oxidation catalysts. In contrast, we report that Pd single atoms are completely inactive for NO oxidation. The diffuse reflectance infra-red spectroscopy (DRIFTS) results show the absence of nitrate formation on catalyst. To explain these results, we explored modified Langmuir-Hinshelwood type pathways that have been proposed for oxidation reactions on single supported atom. In the first pathway, we find that there is energy barrier for the release of NO2 which prevent NO oxidation. In the second pathway, our results show that there is no driving force for the formation of O=N-O-O intermediate or nitrate on single supported Pd atoms. The decomposition of nitrate, if formed, is an endothermic event.Chaitanya K. NarulaLawrence F. AllardMelanie Moses-DeBuskG. Malcom StocksZili WuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chaitanya K. Narula Lawrence F. Allard Melanie Moses-DeBusk G. Malcom Stocks Zili Wu Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation
description	Abstract New convenient wet-chemistry synthetic routes have made it possible to explore catalytic activities of a variety of single supported atoms, however, the single supported atoms on inert substrates (e.g. alumina) are limited to adatoms and cations of Pt, Pd, and Ru. Previously, we have found that single supported Pt atoms are remarkable NO oxidation catalysts. In contrast, we report that Pd single atoms are completely inactive for NO oxidation. The diffuse reflectance infra-red spectroscopy (DRIFTS) results show the absence of nitrate formation on catalyst. To explain these results, we explored modified Langmuir-Hinshelwood type pathways that have been proposed for oxidation reactions on single supported atom. In the first pathway, we find that there is energy barrier for the release of NO2 which prevent NO oxidation. In the second pathway, our results show that there is no driving force for the formation of O=N-O-O intermediate or nitrate on single supported Pd atoms. The decomposition of nitrate, if formed, is an endothermic event.
format	article
author	Chaitanya K. Narula Lawrence F. Allard Melanie Moses-DeBusk G. Malcom Stocks Zili Wu
author_facet	Chaitanya K. Narula Lawrence F. Allard Melanie Moses-DeBusk G. Malcom Stocks Zili Wu
author_sort	Chaitanya K. Narula
title	Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation
title_short	Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation
title_full	Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation
title_fullStr	Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation
title_full_unstemmed	Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation
title_sort	single pd atoms on θ-al2o3 (010) surface do not catalyze no oxidation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/cbbea0ea038049568cfd687b623ffdb4
work_keys_str_mv	AT chaitanyaknarula singlepdatomsonthal2o3010surfacedonotcatalyzenooxidation AT lawrencefallard singlepdatomsonthal2o3010surfacedonotcatalyzenooxidation AT melaniemosesdebusk singlepdatomsonthal2o3010surfacedonotcatalyzenooxidation AT gmalcomstocks singlepdatomsonthal2o3010surfacedonotcatalyzenooxidation AT ziliwu singlepdatomsonthal2o3010surfacedonotcatalyzenooxidation
_version_	1718388672077758464

Single Pd Atoms on θ-Al2O3 (010) Surface do not Catalyze NO Oxidation

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