{"title":"氧化铝支撑的单铂原子吸附和氧化 CO 时形成的稳定物种的鉴定:纳米粒子为何更活跃","authors":"Franck Morfin, Caroline Dessal, Alexis Sangnier, Céline Chizallet* and Laurent Piccolo*, ","doi":"10.1021/acscatal.4c02184","DOIUrl":null,"url":null,"abstract":"<p >Single-atom catalysis is attractive in the context of sustainable chemistry, but single-atom catalysts (SACs) are not always more active than corresponding clusters or nanoparticles. This is the case, <i>inter alia</i>, of CO oxidation on Pt/γ-Al<sub>2</sub>O<sub>3</sub>, an archetypal catalytic system where SACs are poorly active. In the present work, combining diffuse reflectance infrared spectroscopy experiments and density functional theory calculations, we identify the stable species formed on a Pt/γ-Al<sub>2</sub>O<sub>3</sub> SAC compared to its nanocatalyst counterpart. Formates predominantly occupy the alumina support sites, while oxidized Pt<sub>1</sub> species can stabilize carbonyl, carbonate, and bicarbonate species, depending on the temperature regime. Coadsorption of carbonyl and carbonate moieties on the same platinum atom is found likely, based on both experimental and thermodynamic arguments. Unlike the mild adsorption of CO on Pt clusters, allowing for efficient CO oxidation, carbonyl and carbonate species exhibit high stability on the single Pt atoms, which can explain the low activity of the SAC.</p>","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":null,"pages":null},"PeriodicalIF":11.3000,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Identification of Stable Species Formed Under CO Adsorption and Oxidation on Alumina-Supported Single Pt Atoms: Why Nanoparticles Are More Active\",\"authors\":\"Franck Morfin, Caroline Dessal, Alexis Sangnier, Céline Chizallet* and Laurent Piccolo*, \",\"doi\":\"10.1021/acscatal.4c02184\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Single-atom catalysis is attractive in the context of sustainable chemistry, but single-atom catalysts (SACs) are not always more active than corresponding clusters or nanoparticles. This is the case, <i>inter alia</i>, of CO oxidation on Pt/γ-Al<sub>2</sub>O<sub>3</sub>, an archetypal catalytic system where SACs are poorly active. In the present work, combining diffuse reflectance infrared spectroscopy experiments and density functional theory calculations, we identify the stable species formed on a Pt/γ-Al<sub>2</sub>O<sub>3</sub> SAC compared to its nanocatalyst counterpart. Formates predominantly occupy the alumina support sites, while oxidized Pt<sub>1</sub> species can stabilize carbonyl, carbonate, and bicarbonate species, depending on the temperature regime. Coadsorption of carbonyl and carbonate moieties on the same platinum atom is found likely, based on both experimental and thermodynamic arguments. Unlike the mild adsorption of CO on Pt clusters, allowing for efficient CO oxidation, carbonyl and carbonate species exhibit high stability on the single Pt atoms, which can explain the low activity of the SAC.</p>\",\"PeriodicalId\":9,\"journal\":{\"name\":\"ACS Catalysis \",\"volume\":null,\"pages\":null},\"PeriodicalIF\":11.3000,\"publicationDate\":\"2024-06-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Catalysis \",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acscatal.4c02184\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Catalysis ","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acscatal.4c02184","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Identification of Stable Species Formed Under CO Adsorption and Oxidation on Alumina-Supported Single Pt Atoms: Why Nanoparticles Are More Active
Single-atom catalysis is attractive in the context of sustainable chemistry, but single-atom catalysts (SACs) are not always more active than corresponding clusters or nanoparticles. This is the case, inter alia, of CO oxidation on Pt/γ-Al2O3, an archetypal catalytic system where SACs are poorly active. In the present work, combining diffuse reflectance infrared spectroscopy experiments and density functional theory calculations, we identify the stable species formed on a Pt/γ-Al2O3 SAC compared to its nanocatalyst counterpart. Formates predominantly occupy the alumina support sites, while oxidized Pt1 species can stabilize carbonyl, carbonate, and bicarbonate species, depending on the temperature regime. Coadsorption of carbonyl and carbonate moieties on the same platinum atom is found likely, based on both experimental and thermodynamic arguments. Unlike the mild adsorption of CO on Pt clusters, allowing for efficient CO oxidation, carbonyl and carbonate species exhibit high stability on the single Pt atoms, which can explain the low activity of the SAC.
期刊介绍:
ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels.
The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.