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Volume 4

Nano Research & Applications

ISSN: 2471-9838

Page 40


August 16-18, 2018 | Dublin, Ireland





Edition of International Conference on

Nanopharmaceutics and Advanced Drug Delivery



Nano Congress for Future Advancements

Nano Congress 2018


Nano Drug Delivery 2018

August 16-18, 2018

Thermally reduced gold nanoparticles confined by ordered mesoporous carbon as an efficient

catalyst for selective hydrogenation


old nanocatalysts represent a new generation of catalysts for the selective oxidation and reduction using molecular O


and H


, showing great potentials for green chemistry. Activated carbons are one of the most frequently used supports

in industry. However, activated carbon has been seldom used for gold deposition. Here a coordination-assisted self-assembly

approach is adopted for the intercalation of thermally reduced gold nanoparticles inside ordered mesoporous carbon

frameworks. An almost complete conversion of benzyl alcohol to benzoic acid is achieved within 60 min over the Au/C catalyst

with gold nanoparticles approximately 9.0 nm under 90ºC and 1 MPa, using potassium hydroxide as a base. A reduction of

gold particle size from 9.0 to 3.4 nm in the catalyst leads to a high activity toward the selective oxidation of benzyl alcohol

to benzyl acid and toward the reduction of p-nitrophenol to p-aminophenol at low temperatures such as 0°C. The electronic

modification of the d-orbitals of small particles is extremely important for chemisorption of O


at atmosphere pressure and

low temperatures. Interstingly, thermally reduced Au/C nanocatalyst with gold nanoparticles approximately 2.8 nm is highly

active and selective to convert p-chloronitrobenzene and 4-nitrophenol to corresponding amines using H


as a reducing agent,

reaching an initial reaction rate of 12.7 and 6.5 min


, respectively. By comparison, the commercial Au/C catalyst is inert under

the same reaction conditions. Trapping by the SH-functionalized SBA-15 solids confirms the negligible gold leaching and the

heterogeneous active centers for thermally reduced Au/C. Obvious changes are undetected for catalytic performance after five

runs. These results indicate that the gold-containing mesoporous carbon catalyst is stable and can be reused. The simultaneous

thermal reduction of gold nanoparticles and pyrolysis of the matrix may facilitate the involvement of gold inside the carbon

matrix, the modification of carbon atoms on the gold surface, and the reconstruction of the surface induced by CO adsorption.

The generation of low-coordinated gold atoms possibly reduces the H


dissociation barrier, and can therefore significantly

improve the hydrogenation activity.


Ying Wan received her PhD degree in Industrial Catalysis from the East China University of Science and Technology in 2002. Then, she joined Shanghai Normal University

where she was promoted to a full professor in 2006. In 2005-2007, she carried out her postdoctoral research at Fudan University working with Professor Dongyuan Zhao.

Currently, Ying Wan is the leader of the Program for Innovative Research Team in University, China. Her research focuses on sintering-, and poisoning-resistance metal

nanocatalysts supported on mesoporous carbons, and their applications in green organic synthesis and energy chemistry. She has contributed to about 70 peer-reviewed

scientific publications with more than 7000-times citations and 3 books. She has been an associate editor of

Journal of Porous Materials

since 2013.

[email protected]

Ying Wan

Shanghai Normal University, China

Ying Wan, Nano Res Appl 2018, Volume 4

DOI: 10.21767/2471-9838-C3-014