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

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.

Solvent-free oxidation of benzyl alcohol using titania-supported gold–palladium catalysts: Effect of Au–Pd ratio on catalytic performance

2007 ◽  
Vol 122 (3-4) ◽  
pp. 407-411 ◽  
Author(s):  
Dan I. Enache ◽  
Dean Barker ◽  
Jennifer K. Edwards ◽  
Stuart H. Taylor ◽  
David W. Knight ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Palladium Catalysts ◽  
Catalytic Performance ◽  
Solvent Free ◽  
Oxidation Of Benzyl Alcohol ◽  
Gold Palladium Catalysts ◽  
Supported Gold ◽  
Free Oxidation

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.

scholarly journals Preparation of halloysite nanotube-supported gold nanocomposite for solvent-free oxidation of benzyl alcohol

2014 ◽  
Vol 9 (1) ◽  
pp. 282 ◽  
Author(s):  
Xiaobo Fu ◽  
Zhan Ding ◽  
Xuan Zhang ◽  
Wanliang Weng ◽  
Yongjun Xu ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Solvent Free ◽  
Halloysite Nanotube ◽  
Oxidation Of Benzyl Alcohol ◽  
Supported Gold ◽  
Free Oxidation

scholarly journals New bio-nanocomposites based on iron oxides and polysaccharides applied to oxidation and alkylation reactions

2017 ◽  
Vol 13 ◽  
pp. 1982-1993 ◽  
Author(s):  
Daily Rodríguez-Padrón ◽  
Alina M Balu ◽  
Antonio A Romero ◽  
Rafael Luque
Keyword(s):  
Benzyl Alcohol ◽  
Potential Method ◽  
Point Of View ◽  
Conventional Heating ◽  
Alkylation Reaction ◽  
Microwave Assisted ◽  
Oxidation Of Benzyl Alcohol ◽  
Valuable Product ◽  
Mechanochemical Milling ◽  
Alkylation Reactions

Polysaccharides from natural sources and iron precursors were applied to develop new bio-nanocomposites by mechanochemical milling processes. The proposed methodology was demonstrated to be advantageous in comparison with other protocols for the synthesis of iron oxide based nanostructures. Additionally, mechanochemistry has enormous potential from an environmental point-of-view since it is able to reduce solvent issues in chemical syntheses. The catalytic activity of the obtained nanocatalysts was investigated in both the oxidation of benzyl alcohol to benzaldehyde and in the alkylation of toluene with benzyl chloride. The microwave-assisted oxidation of benzyl alcohol reached 45% conversion after 10 min. The conversion of the alkylation of toluene in both microwave-assisted and conventional heating methods was higher than 99% after 3 min and 30 min, respectively. The transformation of benzyl alcohol and toluene into valuable product in both the oxidation and alkylation reaction reveals a potential method for the valorization of lignocellulosic biomass.

scholarly journals Deactivation Behavior of Supported Gold Palladium Nanoalloy Catalysts during the Selective Oxidation of Benzyl Alcohol in a Micropacked Bed Reactor

2017 ◽  
Vol 56 (45) ◽  
pp. 12984-12993 ◽  
Author(s):  
Noor Al-Rifai ◽  
Peter J. Miedziak ◽  
Moataz Morad ◽  
Meenakshisundaram Sankar ◽  
Conor Waldron ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Supported Gold
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