Gold supported on Cu–Mg–Al-mixed oxides: Strong enhancement of activity in aerobic alcohol oxidation by concerted effect of copper and magnesium

Haider, Peter; Baiker, Alfons

doi:10.1016/j.jcat.2007.03.007

Cited by 128 publications

(78 citation statements)

References 52 publications

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“…Strong differences in the activity of Au/TiO 2 and Au/ CeO 2 have been reported in the oxidation of alcohols under ambient pressure [57,69]. However, the difference in activity is also found to be dependent on the conditions, e.g., the solvent, used.…”

Section: Resultsmentioning

confidence: 94%

Gold-Catalyzed Aerobic Oxidation of Benzyl Alcohol: Effect of Gold Particle Size on Activity and Selectivity in Different Solvents

et al. 2008

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The effect of the size of gold particles deposited on CeO 2 and TiO 2 supports on their catalytic behavior in the aerobic oxidation of benzyl alcohol in different solvents (mesitylene, toluene, and supercritical carbon dioxide) has been investigated. The size of supported gold particles deposited via a colloidal route was in the range 1.3-11.3 nm, as determined by means of EXAFS and HAADF-STEM measurements. The catalytic performance of the supported gold catalysts in the different solvents revealed a significant effect of the gold particle size. Optimal activity was observed for catalysts with medium particle size (ca. 6.9 nm) whereas smaller and bigger particles showed inferior activity. Identical trends for the activity-particle size relationship were found using Au/CeO 2 and Au/TiO 2 for the reaction at atmospheric pressure in conventional solvents (mesitylene, toluene) as well as under supercritical conditions (scCO 2 ). Selectivity to benzaldehyde was only weakly affected by the gold particle size and mainly depended on reaction conditions. In supercritical CO 2 (scCO 2 ) selectivity was higher than in the conventional solvents under atmospheric pressure. All catalysts tested with particle sizes ranging from 1.3 to 11.3 nm showed excellent selectivity of 99% or higher under supercritical conditions.

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Section: Resultsmentioning

confidence: 94%

Gold-Catalyzed Aerobic Oxidation of Benzyl Alcohol: Effect of Gold Particle Size on Activity and Selectivity in Different Solvents

et al. 2008

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“…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%

“…It has been well documented in literature that carbon supported Au particles generally exhibited higher activity for glycerol or glycol oxidation than oxides supported catalysts [7][8][9][10], and the catalytic activity was also significantly affected by nature of the supporting carbon materials [17,18,21]. A number of recent investigations further revealed that Au nanoparticles supported on some oxides (e.g., CeO 2 , TiO 2 ) and Cu-Mg-Al mixed oxide could also show high activity for the oxidation of aliphatic and aromatic alcohols [11][12][13][14][15][16]. In the aerobic oxidation of aliphatic alcohols (e.g., 3-octanol), activity of Au/CeO 2 catalyst was even significantly enhanced with reducing the particle size of CeO 2 [11].…”

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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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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“…While some studies in catalysis have demonstrated that the presence of transition metal oxides could improve the activity and stability of the gold catalyst. [15][16][17][18][19][20] Zhang et al 21 successfully conned Au-Cu Alloy nanoparticles with sizes of about 3 nm in the conned space of SBA-15, and achieved higher activity than monometallic particles for preferential CO oxidation in rich H 2 stream. Thereaer, they found that the Au-CuO x was the most active form among Au-Cu alloy nanoparticles that they have studied for the CO oxidation reaction.…”

Section: 45mentioning

confidence: 99%

High efficiency and stability of Au–Cu/hydroxyapatite catalyst for the oxidation of carbon monoxide

Guo

Feng

et al. 2017

RSC Adv.

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A highly efficient and stable Au-Cu/hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) catalyst was reported. HAP was prepared through a deposition-precipitation method. Au-Cu/HAP catalysts were obtained by a two-step impregnation approach. The samples were characterized by XRD, TEM, SEM, UV-Vis, ICP, XPS, H 2 -TPR, and O 2 -TPD. CO oxidation reaction was carried out to evaluate the catalytic performance of samples. TEM and UV-Vis results showed that the metallic particles supported on Au-Cu/HAP were smaller than those on Au/ HAP, and they were highly dispersed on the HAP support. Patterns of XPS revealed that CuO nanoparticles were formed in the Cu/HAP catalyst, while CuO and Cu 2 O species coexisted in Au-Cu/HAP catalyst. Based on the O 2 -TPD data, the addition of copper to Au/HAP gave rise to more new O 2 adsorption sites and bigger O 2 adsorption capacity. The catalysis results indicated that the Au-Cu/HAP was capable of obtaining higher efficiency and stability compared with Au/HAP and Cu/HAP for CO oxidation. It was likely that the synergistic interaction between gold and CuO x phase created the most active sites on Au-Cu/HAP and was responsible for the enhanced activity and stability in comparison with Au/HAP and Cu/HAP.

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Gold supported on Cu–Mg–Al-mixed oxides: Strong enhancement of activity in aerobic alcohol oxidation by concerted effect of copper and magnesium

Cited by 128 publications

References 52 publications

Gold-Catalyzed Aerobic Oxidation of Benzyl Alcohol: Effect of Gold Particle Size on Activity and Selectivity in Different Solvents

Gold-Catalyzed Aerobic Oxidation of Benzyl Alcohol: Effect of Gold Particle Size on Activity and Selectivity in Different Solvents

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

High efficiency and stability of Au–Cu/hydroxyapatite catalyst for the oxidation of carbon monoxide

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