Preparation of TiO2 Supported Gold Nano-Clusters by Photo-Deposition

2010 ◽  
Vol 148-149 ◽  
pp. 1258-1263 ◽  
Author(s):  
Xue Ming Wang ◽  
Guang Jun Wu ◽  
Lan Dong Li ◽  
Nai Jia Guan
Keyword(s):  
Catalytic Activity ◽  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Gold Cluster ◽  
Gold Clusters ◽  
Deposition Method ◽  
Oxidation Of Benzyl Alcohol ◽  
Size And Morphology ◽  
Supported Gold ◽  
Xrd And Tem

TiO2 supported gold clusters are prepared by photo-deposition method. The effect of preparation parameters on the size and morphology of gold clusters are investigated. The as-prepared Au/TiO2 samples are characterized by means of ICP, XRD and TEM. Au/TiO2 samples with different gold cluster sizes are studied as possible catalysts in the selective oxidation of benzyl alcohol to benzaldehyde and smaller gold clusters are observed to exhibit higher catalytic activity.

Selective oxidation of benzyl alcohol to benzaldehyde with H2O2 in water on epichlorohydrin-modified Fe3O4 microspheres

2015 ◽  
Vol 39 (6) ◽  
pp. 4924-4932 ◽  
Author(s):  
Shiwei Xiao ◽  
Chuntao Zhang ◽  
Rong Chen ◽  
Fengxi Chen
Keyword(s):  
Catalytic Activity ◽  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Title Reaction ◽  
Enhancing Effect ◽  
Oxidation Of Benzyl Alcohol ◽  
Fe3o4 Microspheres

The enhancing effect of modification by epichlorohydrin on the catalytic activity of Fe3O4 microspheres in the title reaction was theoretically and experimentally confirmed.

Size Effect of Silica-supported Gold Clusters in the Microwave-assisted Oxidation of Benzyl Alcohol with H2O2

2010 ◽  
Vol 39 (3) ◽  
pp. 159-161 ◽  
Author(s):  
Yongmei Liu ◽  
Hironori Tsunoyama ◽  
Tomoki Akita ◽  
Tatsuya Tsukuda
Keyword(s):  
Size Effect ◽  
Benzyl Alcohol ◽  
Gold Clusters ◽  
Microwave Assisted ◽  
Oxidation Of Benzyl Alcohol ◽  
Supported Gold

scholarly journals Bimetallic Gold-Silver Nanoparticles Supported on Zeolitic Imidazolate Framework-8 as Highly Active Heterogenous Catalysts for Selective Oxidation of Benzyl Alcohol into Benzaldehyde

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1089 ◽  
Author(s):  
Lili Liu ◽  
Xiaojing Zhou ◽  
Yongmei Yan ◽  
Jie Zhou ◽  
Wenping Zhang ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Cluster Structure ◽  
Core Shell ◽  
Zeolitic Imidazolate Framework ◽  
Highly Active ◽  
Oxidation Of Benzyl Alcohol ◽  
Ag Particles ◽  
Gold Silver ◽  
Supported Gold

The metal-organic zeolite imidazolate framework-8 (ZIF-8) supported gold-silver bimetallic catalysts with a core-shell structure (Au@Ag/ZIF-8 and Ag@Au/ZIF-8) and cluster structure (AuAg/ZIF-8) were successfully prepared by the deposition-redispersion method. Energy dispersive X-ray spectroscopy (EDS) elemental mapping images displayed that in the Au@Ag/ZIF-8 catalyst, Ag atoms were deposited on an exposed Au surface, and core-shell structured Au@Ag particles with highly dispersed Ag as the shell were formed. Additionally, the XPS investigation at gold 4f levels and silver 3d levels indicated that the Au and Ag particles of Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were in a zero valence state. Among the resultant catalysts obtained in this study, Ag@Au/ZIF-8 catalysts showed the highest catalytic activity for the selective oxidation of benzyl alcohol, followed by AuAg/ZIF-8 and Au@Ag/ZIF-8. The turnover frequency (TOF) values were in the order of Ag@Au/ZIF-8 (28.2 h−1) > AuAg/ZIF-8 (25.0 h−1) > Au@Ag/ZIF-8 (20.0 h−1) at 130 °C within 1 h under 8 bar O2 when using THF as solvent. The catalysts of Au@Ag/ZIF-8 and Ag@Au/ZIF-8 with core–shell structures have higher benzaldehyde selectivities (53.0% and 53.3%) than the AuAg/ZIF-8 catalyst (35.2%) in the selective oxidation of benzyl alcohol into benzaldehyde. The effect of the solvent, reaction temperature, reaction time, and reaction pressure on benzyl alcohol conversion and benzaldehyde selectivity in benzyl alcohol selective oxidation over Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were also investigated. All of the catalysts showed excellent performance at 130 °C under 8 bar O2 within 1 h when using THF as the solvent in the selective oxidation of benzyl alcohol to benzaldehyde. Moreover, the catalysts can be easily recycled and used repetitively at least four times.

Gold nanoparticles supported on magnesium ferrite and magnesium oxide for the selective oxidation of benzyl alcohol

RSC Advances ◽  
2015 ◽  
Vol 5 (20) ◽  
pp. 15035-15041 ◽  
Author(s):  
Edmilson M. de Moura ◽  
Marco A. S. Garcia ◽  
Renato V. Gonçalves ◽  
Pedro K. Kiyohara ◽  
Renato F. Jardim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Benzyl Alcohol ◽  
Magnesium Oxide ◽  
Selective Oxidation ◽  
Magnesium Ferrite ◽  
Au Nps ◽  
Oxidation Of Benzyl Alcohol

The presence of K2CO3 significantly increased the catalytic activity and stability of Au NPs supported on magnesium oxide-based supports.

scholarly journals Synthesis of new Mn19 analogues and their structural, electrochemical and catalytic properties

2019 ◽  
Vol 48 (15) ◽  
pp. 4830-4836 ◽  
Author(s):  
Elodie Chevallot-Beroux ◽  
Ayuk M. Ako ◽  
Wolfgang Schmitt ◽  
Brendan Twamley ◽  
Joseph Moran ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Catalytic Properties ◽  
Structural Characterisation ◽  
Oxidation Of Benzyl Alcohol

We report the synthesis, structural characterisation, electrochemistry and catalytic activity in the selective oxidation of benzyl alcohol of new Mn19 and Mn18M analogues: [MnIII12MnII7(μ4-O)8(μ3-OCH3)2(μ3-Br)6(HLMe)12(MeOH)6]Br2 (2) and [MnIII12MnII6Sr(μ4-O8(μ3-Cl)8(HLMe)12(MeCN)6]Cl2 cluster (3), where H3LMe is 2,6-bis(hydroxymethyl)-p-cresol.

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