Structure and Reactivity of AgCu/SiO2 Bimetallic Catalysts for Alkene Epoxidation.
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| Title: | Structure and Reactivity of AgCu/SiO |
|---|---|
| Authors: | Soni, Yogita1 (AUTHOR), March, Seth2 (AUTHOR), Suib, Steven L.2,3 (AUTHOR), Sykes, E. Charles H.1,4 (AUTHOR), Deshlahra, Prashant1 (AUTHOR) prashant.deshlahra@tufts.edu |
| Source: | ChemCatChem. 9/19/2025, Vol. 17 Issue 18, p1-15. 15p. |
| Subjects: | Selective catalytic oxidation, Bimetallic catalysts, Nanoparticle synthesis, Catalysts, Silver-copper alloys, Epoxidation, Oxygen reduction |
| Abstract: | AgCu bimetallic materials have attracted significant interest as catalysts for selective oxidation reactions. Near‐surface alloys of Ag on Cu have been shown to activate O2 efficiently at exposed reverse‐segregated isolated Cu atoms within the surface Ag layers. This study focuses on the synthesis of nanoparticle analogs of these alloys and measurement of their performance for ethylene and propylene epoxidation. Supported Cu/SiO2 catalysts were prepared by strong electrostatic adsorption and partial galvanic replacement of Cu atoms with Ag cations in aqueous media, which led to bimetallic nanoparticles of 3–10 nm average size and 0.25–1.6 Ag:Cu atomic ratios. Galvanic exchange stoichiometry, elemental maps and UV–vis spectroscopy reveal coexistence of Ag and Cu in the nanoparticles. Diffuse reflectance infrared spectra of bound CO indicate the formation of nanoparticles with a Cu core and Ag shell when catalysts with high Ag:Cu ratios are reduced to metallic form. The bimetallic catalysts show improvement over monometallic Ag and Cu and their physical mixtures, exhibiting higher rates, higher initial selectivity than Ag, and resistance to secondary reactions that decrease the selectivity of Cu catalysts at higher alkene conversion. These results demonstrate a simple synthesis method of more selective bimetallic AgCu nanoparticles with core‐shell like structures, which may be of use in a variety of selective oxidation reactions. [ABSTRACT FROM AUTHOR] |
| Copyright of ChemCatChem is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 188098138 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Structure and Reactivity of AgCu/SiO<subscript>2</subscript> Bimetallic Catalysts for Alkene Epoxidation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Soni%2C+Yogita%22">Soni, Yogita</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22March%2C+Seth%22">March, Seth</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Suib%2C+Steven+L%2E%22">Suib, Steven L.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sykes%2C+E%2E+Charles+H%2E%22">Sykes, E. Charles H.</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Deshlahra%2C+Prashant%22">Deshlahra, Prashant</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> prashant.deshlahra@tufts.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22ChemCatChem%22">ChemCatChem</searchLink>. 9/19/2025, Vol. 17 Issue 18, p1-15. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Selective+catalytic+oxidation%22">Selective catalytic oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Bimetallic+catalysts%22">Bimetallic catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticle+synthesis%22">Nanoparticle synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Silver-copper+alloys%22">Silver-copper alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Epoxidation%22">Epoxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+reduction%22">Oxygen reduction</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: AgCu bimetallic materials have attracted significant interest as catalysts for selective oxidation reactions. Near‐surface alloys of Ag on Cu have been shown to activate O2 efficiently at exposed reverse‐segregated isolated Cu atoms within the surface Ag layers. This study focuses on the synthesis of nanoparticle analogs of these alloys and measurement of their performance for ethylene and propylene epoxidation. Supported Cu/SiO2 catalysts were prepared by strong electrostatic adsorption and partial galvanic replacement of Cu atoms with Ag cations in aqueous media, which led to bimetallic nanoparticles of 3–10 nm average size and 0.25–1.6 Ag:Cu atomic ratios. Galvanic exchange stoichiometry, elemental maps and UV–vis spectroscopy reveal coexistence of Ag and Cu in the nanoparticles. Diffuse reflectance infrared spectra of bound CO indicate the formation of nanoparticles with a Cu core and Ag shell when catalysts with high Ag:Cu ratios are reduced to metallic form. The bimetallic catalysts show improvement over monometallic Ag and Cu and their physical mixtures, exhibiting higher rates, higher initial selectivity than Ag, and resistance to secondary reactions that decrease the selectivity of Cu catalysts at higher alkene conversion. These results demonstrate a simple synthesis method of more selective bimetallic AgCu nanoparticles with core‐shell like structures, which may be of use in a variety of selective oxidation reactions. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of ChemCatChem is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/cctc.202500921 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 1 Subjects: – SubjectFull: Selective catalytic oxidation Type: general – SubjectFull: Bimetallic catalysts Type: general – SubjectFull: Nanoparticle synthesis Type: general – SubjectFull: Catalysts Type: general – SubjectFull: Silver-copper alloys Type: general – SubjectFull: Epoxidation Type: general – SubjectFull: Oxygen reduction Type: general Titles: – TitleFull: Structure and Reactivity of AgCu/SiO2 Bimetallic Catalysts for Alkene Epoxidation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Soni, Yogita – PersonEntity: Name: NameFull: March, Seth – PersonEntity: Name: NameFull: Suib, Steven L. – PersonEntity: Name: NameFull: Sykes, E. Charles H. – PersonEntity: Name: NameFull: Deshlahra, Prashant IsPartOfRelationships: – BibEntity: Dates: – D: 19 M: 09 Text: 9/19/2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 18673880 Numbering: – Type: volume Value: 17 – Type: issue Value: 18 Titles: – TitleFull: ChemCatChem Type: main |
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