Selective oxidation of ethanol to acetaldehyde over Au–Cu catalysts prepared by a redox method

Редина, Е. А.; Greish, A. A.; Мишин, И. В.; Капустин, Г. И.; Ткаченко, О. П.; Kustov, L. М.

doi:10.1016/j.cattod.2013.11.065

Cited by 88 publications

(40 citation statements)

References 35 publications

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“…Similar behaviour of the absence of CuO phase was also observed in Ref. [33]. Compared with pure Au pattern, AuCueC slightly shifted to lower angles confirming core shell architecture.…”

Section: Crystallography Of Aucuec and Auec Catalystssupporting

confidence: 83%

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

Oseghale

Abdalla

Posada

et al. 2016

International Journal of Hydrogen Energy

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Available online xxxKeywords: SynthesisCore-shell Catalyst Low-cost DFAFCs a b s t r a c tIn the efforts to develop a more sustainable energy mix there is an urgent need to develop new materials for environmentally friendly processes. Developing low metal loading anode catalyst with high electrocatalytic activity for liquid fuel cells remains a great challenge.Polyvinylpyrrolodone-protected AuCueC core-shell was fabricated by a facile one-pot modified chemical reduction method. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM) analyses. XRD analysis indicates the preferential orientation of catalytically active (111) planes in AuCueC core-shell nanoparticles. The inclusion of Cu in the AuCueC catalysts increased catalytic activities, which can be attributed to the increases lattice parameters.Comparative results show that AuCueC catalyst exhibited much better electrocatalytic activity and stabilization compared to commercial Au nanoparticle on carbon support catalyst. The high performance of AuCueC catalyst may be attributed to the electronic coupling or synergistic interaction between Cu core structure, and the Au shell makes it a promising for DFAFCs applications.

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“…Similar behaviour of the absence of CuO phase was also observed in Ref. [33]. Compared with pure Au pattern, AuCueC slightly shifted to lower angles confirming core shell architecture.…”

Section: Crystallography Of Aucuec and Auec Catalystssupporting

confidence: 83%

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

Oseghale

Abdalla

Posada

et al. 2016

International Journal of Hydrogen Energy

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“…b) Acetaldehyde selectivity at the same ethanol conversion (80 %) over different catalysts. c) Space–time–yield of acetaldehyde versus temperature for the catalysts described in this work and those previously reported (that is, catalysts 1 – 6 ; see the Supporting Information, Table S1) . d) Ethanol conversion and acetaldehyde selectivity versus time on‐stream by using the Au–Cu/BN‐Sphere catalyst.…”

Section: Figurementioning

confidence: 78%

Spherical Boron Nitride Supported Gold–Copper Catalysts for the Low‐Temperature Selective Oxidation of Ethanol

Wang

Shi

et al. 2017

ChemCatChem

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The oxidation of ethanol to acetaldehyde in the fine-chemical industry is ab urgeoning process that requires leading-edge technology.Amajor challenge is to find ac atalyst with high ethanol conversion and high acetaldehyde selectivity at ah igh gas hourly space velocity (GHSV) and alow operation temperature. Boron nitride nanosphere supported Au-Cu nanoparticles offer much opportunity for low-temperature ethanol oxidation. Ac atalytic ethanol conversion of 77 %a nd as electivity of 94 % towardsa cetaldehydew ere achieved at at emperature of 180 8Ca nd ah igh GHSV of 100 000 mL g cat À1 h À1 ,v alues that far exceed those obtained with Au-Cu/SiO 2 .T he immobilized Au-Cu nanoparticles have an average size of approximately 3nm, and the majority of Au speciesa re assigned Au dÀ .T he weak interaction of acetaldehyde with both Au-Cu active phases and the boronn itride support facilitates the adsorption-desorption behavior of acetaldehyde. As ar esult, the progression of secondary reactions is slowed and the degree of coverage of the active sites is minimized.Ethanoli sar enewabler esource of high value in the production of acetaldehyde, [1] 1-butanol, [2] 1,3-butadiene, [3] and other chemicals [4] and thus reduces our strong dependence on fossil fuels. [5] The production of acetaldehyde from ethanol is especially promising owing to its low cost, high atom economy, and easy separation of products. This also fits with the developing trend of green chemistry.T he two synthesis options that are available are dehydrogenation and oxidation. [6] The oxidation method is more attractive owing to the lower reaction temperature and no limitations of at hermodynamic equilibrium. Therein, molecular oxygen is now used as an inexpensive and clean oxidanta nd can replacep revioust oxic and expensive ones. [7] Supported Au catalysts have been widely studied for the aerobic oxidationo fe thanol owing to their ability to activate CÀHb onds. The addition of Cu can improvet he conversion and selectivity of the catalyst, as Cu can activate O 2 and facilitate OÀHb ond cleavage. [8] Traditionally,o xides such as SiO 2 , CeO 2 ,a nd TiO 2 have been used for the immobilizationo fA u-Cu active phases. [9] The catalytic performance of these oxidesupported catalysts are, however,s till far from practicality owing to very low ethanol concentrations( < 1vol %) andl ow gas hourly space velocityv alues (GHSV < 10 000 mL g cat À1 h À1 ), even at high reactiont emperatures (> 200 8C). In general,A u nanoparticles interacts trongly with the oxide supports to form Au 0 and Au d + species. [10] Acetaldehyde with an electron-richO atom can potentially adsorb and block the Au 0 and Au d + sites. Furthermore, upon considering the exothermic nature of the ethanol oxidation reaction,t he use of oxide supports with poor thermalc onductivity may form hot reactions pots. [11] As ac onsequence, the oxidation of acetaldehyde and agglomeration of the active species may occur.H ence, the overwhelming challenge is to develop ac atalystt hat can oxidize ethanol...

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“…The second stage is a modification of this parent catalyst by the deposition of a second metal on the surface of the metal nanoparticles (NPs) in the parent catalyst. This can be achieved by the direct redox reaction between the modifier metal in the oxidized form and the reduced parent metal due to different standard redox potentials of the metal couple [36][37][38][39][40]. Another approach of this method is an interaction of the modifier with the reductant preadsorbed on metal NPs in the parent catalysts [41][42][43][44].…”

Section: Introductionmentioning

confidence: 98%

Au/Pt/TiO2 catalysts prepared by redox method for the chemoselective 1,2-propanediol oxidation to lactic acid and an NMR spectroscopy approach for analyzing the product mixture

Редина

Greish

Новиков

et al. 2015

Applied Catalysis A: General

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Selective oxidation of ethanol to acetaldehyde over Au–Cu catalysts prepared by a redox method

Cited by 88 publications

References 35 publications

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

A new synthesis route for sustainable gold copper utilization in direct formic acid fuel cells

Spherical Boron Nitride Supported Gold–Copper Catalysts for the Low‐Temperature Selective Oxidation of Ethanol

Au/Pt/TiO2 catalysts prepared by redox method for the chemoselective 1,2-propanediol oxidation to lactic acid and an NMR spectroscopy approach for analyzing the product mixture

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