Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation

Metallic Pt sites are imperative in the CO oxidation reaction. Herein, we demonstrate the tuning of Pt sites by treating a Pt catalyst in various reductive atmospheres, influencing the catalyst activities in low-temperature CO oxidation. The H<sub>2</sub> pretreatment of Pt clusters at 2...

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Autores principales:	Kailin He, Qingyue Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	reduction pretreatment metallic Pt sites CO adsorption CO oxidation reactive intermediate Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/2c6af36c859444f68067f9b988cd491c
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spelling	oai:doaj.org-article:2c6af36c859444f68067f9b988cd491c2021-11-25T17:05:24ZActivation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation10.3390/catal111112802073-4344https://doaj.org/article/2c6af36c859444f68067f9b988cd491c2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1280https://doaj.org/toc/2073-4344Metallic Pt sites are imperative in the CO oxidation reaction. Herein, we demonstrate the tuning of Pt sites by treating a Pt catalyst in various reductive atmospheres, influencing the catalyst activities in low-temperature CO oxidation. The H<sub>2</sub> pretreatment of Pt clusters at 200 °C decreases the T<sub>50</sub> from 208 °C to 183 °C in the 0.1 wt % Pt/TiO<sub>2</sub> catalyst. The T<sub>50</sub> shows a remarkable improvement using a CO pretreatment, which decreases the T<sub>50</sub> further to 135 °C. A comprehensive characterization study reveals the integrated reasons behind this phenomenon: (i) the extent of PtO transition to metallic Pt sites, (ii) the ample surface active oxygen triggered by metallic Pt, (iii) the CO selectively adsorbs on metallic Pt sites which participate in low-temperature CO oxidation, and (iv) the formation of the unstable intermediate such as bicarbonate, contributes together to the enhanced activity of CO pretreated Pt/TiO<sub>2</sub>.Kailin HeQingyue WangMDPI AGarticlereduction pretreatmentmetallic Pt sitesCO adsorptionCO oxidationreactive intermediateChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1280, p 1280 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	reduction pretreatment metallic Pt sites CO adsorption CO oxidation reactive intermediate Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	reduction pretreatment metallic Pt sites CO adsorption CO oxidation reactive intermediate Chemical technology TP1-1185 Chemistry QD1-999 Kailin He Qingyue Wang Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
description	Metallic Pt sites are imperative in the CO oxidation reaction. Herein, we demonstrate the tuning of Pt sites by treating a Pt catalyst in various reductive atmospheres, influencing the catalyst activities in low-temperature CO oxidation. The H<sub>2</sub> pretreatment of Pt clusters at 200 °C decreases the T<sub>50</sub> from 208 °C to 183 °C in the 0.1 wt % Pt/TiO<sub>2</sub> catalyst. The T<sub>50</sub> shows a remarkable improvement using a CO pretreatment, which decreases the T<sub>50</sub> further to 135 °C. A comprehensive characterization study reveals the integrated reasons behind this phenomenon: (i) the extent of PtO transition to metallic Pt sites, (ii) the ample surface active oxygen triggered by metallic Pt, (iii) the CO selectively adsorbs on metallic Pt sites which participate in low-temperature CO oxidation, and (iv) the formation of the unstable intermediate such as bicarbonate, contributes together to the enhanced activity of CO pretreated Pt/TiO<sub>2</sub>.
format	article
author	Kailin He Qingyue Wang
author_facet	Kailin He Qingyue Wang
author_sort	Kailin He
title	Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
title_short	Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
title_full	Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
title_fullStr	Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
title_full_unstemmed	Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
title_sort	activation of pt nanoclusters on tio<sub>2</sub> via tuning the metallic sites to promote low-temperature co oxidation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2c6af36c859444f68067f9b988cd491c
work_keys_str_mv	AT kailinhe activationofptnanoclustersontiosub2subviatuningthemetallicsitestopromotelowtemperaturecooxidation AT qingyuewang activationofptnanoclustersontiosub2subviatuningthemetallicsitestopromotelowtemperaturecooxidation
_version_	1718412704085966848

Activation of Pt Nanoclusters on TiO<sub>2</sub> via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation

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