{"title":"Cu3Pt1 alloys confined by penta-coordinate Al3+ on Al2O3 realize CO oxidation at room temperature","authors":"","doi":"10.1016/j.mcat.2024.114664","DOIUrl":null,"url":null,"abstract":"<div><div>CO is a ubiquitous air pollutant, frequently encountered in the fields of automotive exhaust purification, especial in the cold-start-emission stage. Pt based catalysts are widely used to purify CO into CO<sub>2</sub> owing to their exceptional performance. But they can be few excited to exhibit reasonable catalytic activity due to the low temperature at the cold-start-emission stage. In exhaust gas purification catalysts used by fossil fuel-based vehicles, Al<sub>2</sub>O<sub>3</sub> is used frequently. But there are rarely reports of Pt loaded Al<sub>2</sub>O<sub>3</sub> catalysts achieving feasible activity of CO oxidation at room temperature. Herein, we prepared Cu<sub>x</sub>Pt<sub>y</sub> alloy/Al<sub>2</sub>O<sub>3</sub> catalysts (with high penta-coordinated Al<sup>3+</sup> (Al<sub>V</sub>)), Al<sub>V</sub> centers as binding sites for Cu<sub>3</sub>Pt<sub>1</sub> alloys on Al<sub>2</sub>O<sub>3</sub> enable the high dispersion and stability of Cu<sub>3</sub>Pt<sub>1</sub> alloy. The adsorption capacity of O<sub>2</sub> and CO molecules on Cu<sub>3</sub>Pt<sub>1</sub> surface are stronger than the case on Pt surface, which may make O<sub>2</sub> and CO molecules more easily activated, making the CO oxidation reaction easier. In addition, the desorption of CO<sub>2</sub> from Cu<sub>x</sub>Pt<sub>y</sub> surface is easier compared to that on Pt surface, increasing the frequency of use of active sites there. Therefore, this Cu<sub>3</sub>Pt<sub>1</sub>/Al<sub>2</sub>O<sub>3</sub> catalyst exhibits 100 % conversion of CO with a GHSV of 6×10<sup>3</sup> mL·g<sup>−1</sup><sub>cat</sub>·h<sup>−1</sup> at room temperature. This work provides a feasible guideline for the design and synthesis of Pt loaded Al<sub>2</sub>O<sub>3</sub> catalysts toward room temperature CO oxidation.</div></div>","PeriodicalId":393,"journal":{"name":"Molecular Catalysis","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Molecular Catalysis","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2468823124008460","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
CO is a ubiquitous air pollutant, frequently encountered in the fields of automotive exhaust purification, especial in the cold-start-emission stage. Pt based catalysts are widely used to purify CO into CO2 owing to their exceptional performance. But they can be few excited to exhibit reasonable catalytic activity due to the low temperature at the cold-start-emission stage. In exhaust gas purification catalysts used by fossil fuel-based vehicles, Al2O3 is used frequently. But there are rarely reports of Pt loaded Al2O3 catalysts achieving feasible activity of CO oxidation at room temperature. Herein, we prepared CuxPty alloy/Al2O3 catalysts (with high penta-coordinated Al3+ (AlV)), AlV centers as binding sites for Cu3Pt1 alloys on Al2O3 enable the high dispersion and stability of Cu3Pt1 alloy. The adsorption capacity of O2 and CO molecules on Cu3Pt1 surface are stronger than the case on Pt surface, which may make O2 and CO molecules more easily activated, making the CO oxidation reaction easier. In addition, the desorption of CO2 from CuxPty surface is easier compared to that on Pt surface, increasing the frequency of use of active sites there. Therefore, this Cu3Pt1/Al2O3 catalyst exhibits 100 % conversion of CO with a GHSV of 6×103 mL·g−1cat·h−1 at room temperature. This work provides a feasible guideline for the design and synthesis of Pt loaded Al2O3 catalysts toward room temperature CO oxidation.
期刊介绍:
Molecular Catalysis publishes full papers that are original, rigorous, and scholarly contributions examining the molecular and atomic aspects of catalytic activation and reaction mechanisms. The fields covered are:
Heterogeneous catalysis including immobilized molecular catalysts
Homogeneous catalysis including organocatalysis, organometallic catalysis and biocatalysis
Photo- and electrochemistry
Theoretical aspects of catalysis analyzed by computational methods