fulltext.study @t Gmail

Preparation of bimetallic gold catalysts by redox reaction on oxide-supported metals for green chemistry applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
54234 47001 2015 16 PDF Available
Title
Preparation of bimetallic gold catalysts by redox reaction on oxide-supported metals for green chemistry applications
Abstract

•Oxide-supported Au bimetallic catalysts were prepared by a redox-method.•Redox-method extended variation in the bimetallic composition and reactions over them.•The low-loaded Au bimetallic catalysts showed high activity in the oxidation reactions.•The Au/Pt, Au/Pd, Au/Ru catalysts were efficient in glycerol transformation reactions.

The major problem in successful preparation of bimetallic supported catalysts is the formation of an extended contact area between the monometallic phases. The selective deposition of Au on the surface of nanoparticles of a primary oxide-supported metal has been performed by a redox method that is based on the reduction of the second metal (M2) ions with hydrogen adsorbed on the surface of first metal (M1) or with M1 itself. The gold containing bimetallic catalysts with different atomic ratios and metal combinations Au–M1 (M1 = Pd, Pt, Rh, Ru, and Au–RuOx) deposited on oxide supports (TiO2, SiO2 or θ-Al2O3) have been prepared by this method with special emphasis on the preparation of low-loaded gold containing bimetallic catalysts. The samples were characterized by X-ray diffraction analysis (XRD), scanning transmission electron microscopy (STEM), temperature programmed reduction (TPR) analysis, CO adsorption, X-ray photoelectron spectroscopy (XPS), Diffuse reflectance Fourier-transform IR spectroscopy of adsorbed CO (DRIFTS-CO). By varying the conditions of the preparation procedure, the direct contact area was obtained either between two metal phases (Au/M1) or between metal and a metal oxide phase (Au/M1Ox) that changed the catalytic properties of primary supported M1. The prepared bimetallic catalysts exhibited the high activity in various reactions: from the Cl-VOC oxidative degradation to the up-to-date “green” reactions aimed at the synthesis of fine chemicals from ethanol and glycerol.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (197 K)Download as PowerPoint slide

Keywords
Bimetallic catalysts; Redox reaction method; Gold nanoparticles; Ethanol; Glycerol; Lactic acid
First Page Preview
Preparation of bimetallic gold catalysts by redox reaction on oxide-supported metals for green chemistry applications
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 246, 15 May 2015, Pages 216–231
Authors
, , , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us