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Au–Cu on Nb2O5 and Nb/MCF supports – Surface properties and catalytic activity in glycerol and methanol oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
53748 46982 2015 11 PDF Available
Title
Au–Cu on Nb2O5 and Nb/MCF supports – Surface properties and catalytic activity in glycerol and methanol oxidation
Abstract

•Synergetic effect between Au and Cu is identified in supported Nb/MCF and Nb2O5.•The presence of Cu species influences activity and selectivity of AuCu-catalysts.•AuCu–Nb2O5 turns selectivity to glycolic acid in glycerol oxidation.•AuCu–Nb2O5 and AuCu–Nb/MCF are active in total oxidation of methanol.

Nb2O5 and Nb/MCF were used as supports for gold and copper (Au–Cu system). The activity of these catalysts in the oxidation of glycerol in the liquid phase and methanol in the gas phase was compared with that of monometallic gold catalysts. The oxidation states of metals in the samples prepared were characterised by XRD, TEM, UV–Vis, XPS and H2-TPR. It was found that gold was present in metallic form, whereas copper in the form of CuO, oligonuclear [Cuδ+⋯Oδ−⋯Cuδ+]n clusters and isolated cations. The introduction of copper changed the electronic state of gold in Au–Nb2O5 and Au–Nb/MCF and the reduction of copper was found easier in bimetallic AuCu catalysts, which was interpreted as a result of the interaction between gold and copper. Nb2O5 supported catalysts were active in the glycerol oxidation. Monometallic catalysts show high selectivity to glyceric acid, whereas an increase in the selectivity to glycolic acid was found over bimetallic samples due to the presence of copper species active in the oxidative dehydrogenation of glyceric acid. Au–Cu catalysts exhibit very high activity in methanol oxidation towards CO2 as a result of the presence of basic oxygen from CuO-like species on the catalyst surface. Superior performance of bimetallic catalysts in oxidation reactions is due to the synergy between gold and copper.

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Keywords
Nb2O5; Nb/MCF; Au–Cu system; Glycerol and methanol oxidation
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Au–Cu on Nb2O5 and Nb/MCF supports – Surface properties and catalytic activity in glycerol and methanol oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 254, 1 October 2015, Pages 72–82
Authors
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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