Immobilized PVA-stabilized gold nanoparticles on silica show an unusual selectivity in the hydrogenation of cinnamaldehyde

Shi, Hui; Xu, Na; Zhao, Dan; Xu, Bin

doi:10.1016/j.catcom.2008.03.025

Cited by 58 publications

(64 citation statements)

References 40 publications

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“…While it is impossible at this stage to make a general conclusion on the nano-size effect of Au in the different oxidation reactions, our present observation using non-interacting SiO 2 for the support of narrowly sized particles would help to better understand the intrinsic effect of Au particle size in the selective aerobic oxidation of ethanol (or primary alcohols). In our recent work on selective hydrogenation of cinnamaldehyde, these Au/SiO 2 catalysts were found peculiar to the C=C hydrogenation while competitive hydrogenation at both C=C and C=O bonds of cinnamaldehyde prevailed when the same Au particles were immobilized on ZrO 2 [6].…”

Section: Resultsmentioning

confidence: 95%

“…Nanosized gold particles in intimate contact with support materials was found to exhibit high activity/selectivity in a number of reactions, including low temperature CO oxidation [1][2][3], propylene epoxidation [1][2][3], selective hydrogenation of unsaturated hydrocarbons, and so on [4][5][6]. Recently, it was further found that Au nanoparticles, as compared with Pt-group catalysts, are more selective as well as stable for liquidphase oxidation of various alcohols to their corresponding aldehydes/acids [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Gold Nano-size Effect in Au/SiO2 for Selective Ethanol Oxidation in Aqueous Solution

Sun

Luo

et al. 2008

Catal Lett

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Narrowly sized colloidal Au particles of varying average sizes (3-30 nm) were immobilized on an inert support (SiO 2 ) to study the Au size effect on the aerobic oxidation of ethanol in aqueous solution. Au particles with an average diameter of 5 nm showed an areal activity that was about three times that of the smaller (3 nm), and 15 times that of larger (10-30 nm) Au particles. Investigation on the dependence of product yields on ethanol conversion over these differently sized Au particles clearly uncovered that the yield of acetic acid increased always with the ethanol conversion, while that of acetaldehyde passed a maximum at an ethanol conversion of 20-30%, therefore well demonstrating that acetaldehyde is the intermediate product in the oxidation of ethanol to acetic acid.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Gold Nano-size Effect in Au/SiO2 for Selective Ethanol Oxidation in Aqueous Solution

Sun

Luo

et al. 2008

Catal Lett

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“…Substrate conversion and target product selectivity in the selective hydrogenation of α,β-unsaturated aldehyde were often found to be sensitive to the reaction temperature [39][40][41]. Table 6 Table 7.…”

Section: Resultsmentioning

confidence: 99%

Selective Hydrogenation of Cinnamaldehyde Catalyzed by ZnO-Fe2O3 Mixed Oxide Supported Gold Nanocatalysts

et al. 2018

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ZnO-Fe 2 O 3 mixed oxides and supported gold nanocatalysts were prepared by using coprecipitation and deposition-precipitation methods, respectively. Cinnamaldehyde hydrogenation over various ZnO-Fe 2 O 3 mixed oxides supported gold nanocatalysts have been investigated at 140 • C and a hydrogen pressure of 1.0 MPa. The molar ratio of Fe to Zn was found to greatly affect the selective hydrogenation catalytic activity of ZnO-Fe 2 O 3 mixed oxide supported gold nanocatalysts. Among these supported gold nanocatalysts in this work, Au/Zn 0.7 Fe 0.3 O x (Au loading of 1.74 wt %) exhibited the highest conversion of cinnamaldehyde and high selectivity to cinnamal alcohol. The excellent catalytic activity of Au/Zn 0.7 Fe 0.3 O x was tightly associated with a large surface area, small gold nanoparticles, and good H 2 dissociation ability at low temperature.

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“…This procedure is based on the reduction of HAuCl 4 (the gold precursor) by sodium citrate in boiling water to get particles with a diameter around *15 nm. Other procedures have been developed later in order to decrease the particle's diameter, by changing the reductant (e.g., azacryptand) (Lee et al 2007), or by adding organic polymer stabilizers as polyvinyl alcohol (PVA) (Shi et al 2008) or poly(N-vinyl-2-pyrrolidone) (PVP) (Grace and Pandian 2006). However, these procedures led to gold nanoparticles enrobed by stabilizing organic materials which could turn out little effective as catalysts.…”

Section: Resultsmentioning

confidence: 98%

Gold nanoparticle synthesis in microfluidic systems and immobilisation in microreactors designed for the catalysis of fine organic reactions

Ftouni

Girardon

Penhoat³

et al. 2011

Microsyst Technol

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Our work is focused on two applications of fine tunable microfluidic systems, first to optimize heterogeneous size nanoparticle synthesis and second to build catalytic microreactors for advanced organic reactions. The first part of our work consists in the use of an original microfluidic setup for gold nanoparticle synthesis, which allows a high control of the reaction parameters as the reactants flow, the concentration, the temperature, and the reaction time. We show that using such microfluidic systems permit a better control of the reaction parameters for producing homodispersed 1-2 nm gold nanoparticle. The second part of our work deals with the incorporation of gold nanoparticles into silica capillaries to build catalytic microreactors dedicated to fine chemical reactions. Our strategy consists in the immobilization of gold nanopadiegolirticles onto the inner surface (2D dispersion) or into the inner volume (3D dispersion) of functionalized silica microcapillaries. Characterizations show that by different functionalization procedures, those gold nanoparticles are well anchored inside the microcapillary.

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Immobilized PVA-stabilized gold nanoparticles on silica show an unusual selectivity in the hydrogenation of cinnamaldehyde

Cited by 58 publications

References 40 publications

Gold Nano-size Effect in Au/SiO2 for Selective Ethanol Oxidation in Aqueous Solution

Gold Nano-size Effect in Au/SiO2 for Selective Ethanol Oxidation in Aqueous Solution

Selective Hydrogenation of Cinnamaldehyde Catalyzed by ZnO-Fe2O3 Mixed Oxide Supported Gold Nanocatalysts

Gold nanoparticle synthesis in microfluidic systems and immobilisation in microreactors designed for the catalysis of fine organic reactions

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