Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene

Ag/Cu bimetallic nanocatalysts supported on reticulate-like γ-alumina were prepared by a microemulsion method using N2H4·H2O as the reducing agent. The catalysts were activated by calcination followed with hydrogen reduction at 873K, and the properties were confirmed using various characterization t...

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Main Authors:	Hong-Kui Wang, Chao-Yong Yi, Li Tian, Wen-Juan Wang, Jian Fang, Ji-Hua Zhao, Wei-Guo Shen
Format:	Article
Language:	English
Published:	Hindawi Limited 2012-01-01
Series:	Journal of Nanomaterials
Online Access:	http://dx.doi.org/10.1155/2012/453915

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spelling	doaj-03bb7863243145358a60f1b6103cf7ec2020-11-24T23:20:24ZengHindawi LimitedJournal of Nanomaterials1687-41101687-41292012-01-01201210.1155/2012/453915453915Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of StyreneHong-Kui Wang0Chao-Yong Yi1Li Tian2Wen-Juan Wang3Jian Fang4Ji-Hua Zhao5Wei-Guo Shen6School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, ChinaSchool of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, ChinaThe Chemistry Department, Fudan University, Shanghai 200433, ChinaSchool of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, ChinaSchool of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, ChinaSchool of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, ChinaSchool of Chemistry and Chemical Engineering, East China University of Science and Technology, Shanghai 200237, ChinaAg/Cu bimetallic nanocatalysts supported on reticulate-like γ-alumina were prepared by a microemulsion method using N2H4·H2O as the reducing agent. The catalysts were activated by calcination followed with hydrogen reduction at 873K, and the properties were confirmed using various characterization techniques. Compared with metal oxides particles, Ag-Cu particles exhibited smaller sizes (<5 nm) after calcination in H2 at 873K. XPS results indicated that the binding energies changed with the Ag/Cu ratios, suggesting that increasing the copper content gave both metals a greater tendency to lose electrons. Furthermore, Ag-Cu bimetallic nanoparticles supported on γ-alumina showed better catalytic activity on the epoxidation of styrene as compared with the corresponding monometallic silver or copper. The styrene oxide selectivity could reach 76.6% at Ag/Cu molar ratio of 3/1, while the maximum conversion (up to 94.6%) appeared at Ag/Cu molar ratio of 1/1 because of the maximum interaction between silver and copper.http://dx.doi.org/10.1155/2012/453915
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Hong-Kui Wang Chao-Yong Yi Li Tian Wen-Juan Wang Jian Fang Ji-Hua Zhao Wei-Guo Shen
spellingShingle	Hong-Kui Wang Chao-Yong Yi Li Tian Wen-Juan Wang Jian Fang Ji-Hua Zhao Wei-Guo Shen Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene Journal of Nanomaterials
author_facet	Hong-Kui Wang Chao-Yong Yi Li Tian Wen-Juan Wang Jian Fang Ji-Hua Zhao Wei-Guo Shen
author_sort	Hong-Kui Wang
title	Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene
title_short	Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene
title_full	Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene
title_fullStr	Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene
title_full_unstemmed	Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene
title_sort	ag-cu bimetallic nanoparticles prepared by microemulsion method as catalyst for epoxidation of styrene
publisher	Hindawi Limited
series	Journal of Nanomaterials
issn	1687-4110 1687-4129
publishDate	2012-01-01
description	Ag/Cu bimetallic nanocatalysts supported on reticulate-like γ-alumina were prepared by a microemulsion method using N2H4·H2O as the reducing agent. The catalysts were activated by calcination followed with hydrogen reduction at 873K, and the properties were confirmed using various characterization techniques. Compared with metal oxides particles, Ag-Cu particles exhibited smaller sizes (<5 nm) after calcination in H2 at 873K. XPS results indicated that the binding energies changed with the Ag/Cu ratios, suggesting that increasing the copper content gave both metals a greater tendency to lose electrons. Furthermore, Ag-Cu bimetallic nanoparticles supported on γ-alumina showed better catalytic activity on the epoxidation of styrene as compared with the corresponding monometallic silver or copper. The styrene oxide selectivity could reach 76.6% at Ag/Cu molar ratio of 3/1, while the maximum conversion (up to 94.6%) appeared at Ag/Cu molar ratio of 1/1 because of the maximum interaction between silver and copper.
url	http://dx.doi.org/10.1155/2012/453915
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Ag-Cu Bimetallic Nanoparticles Prepared by Microemulsion Method as Catalyst for Epoxidation of Styrene

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