ChemInform Abstract: A Magnetically Separable Gold Catalyst for Chemoselective Reduction of Nitro Compounds.

ChemInform ◽  
2013 ◽  
Vol 44 (23) ◽  
pp. no-no
Author(s):  
Sungho Park ◽  
In Su Lee ◽  
Jaiwook Park
Keyword(s):  
Gold Catalyst ◽  
Nitro Compounds ◽  
Magnetically Separable

Magnetically Separable Gold Catalyst for the Aerobic Oxidation of Amines

ChemCatChem ◽  
2009 ◽  
Vol 1 (1) ◽  
pp. 111-115 ◽  
Author(s):  
Linda Aschwanden ◽  
Barbara Panella ◽  
Peggy Rossbach ◽  
Beat Keller ◽  
Alfons Baiker
Keyword(s):  
Aerobic Oxidation ◽  
Gold Catalyst ◽  
Magnetically Separable

scholarly journals Graphene Supported Pt/Ni Nanoparticles as Magnetically Separable Nanocatalysts

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Ru Liu ◽  
Qingshan Zhao ◽  
Yang Li ◽  
Guoliang Zhang ◽  
Fengbao Zhang ◽  
...  
Keyword(s):  
Catalytic Reduction ◽  
Nitro Compounds ◽  
Ni Nanoparticles ◽  
Catalytic Activities ◽  
Noble Metal Catalysts ◽  
One Step ◽  
Magnetically Separable ◽  
Aromatic Nitro ◽  
Efficient Recovery ◽  
Superparamagnetic Properties

Efficient recovery of nanocatalysts, especially the graphene supported noble metal catalysts, is a challenge. In this study, we report a simple one-step route to prepare the graphene supported Pt/Ni nanocatalysts with ideal superparamagnetic properties. We demonstrated that they had excellent catalytic activities in the catalytic reduction of aromatic nitro compounds and could be easily separated from the reaction mixtures by applying an external magnetic field.

Electron Holographic Nano-Characterization of Gold Catalyst at Interface

2002 ◽  
Vol 727 ◽  
Author(s):  
S. Ichikawa ◽  
T. Akita ◽  
M. Okumura ◽  
M. Haruta ◽  
K. Tanaka
Keyword(s):  
Contact Angle ◽  
Titanium Oxide ◽  
Gold Catalyst ◽  
Three Dimensional ◽  
High Resolution Electron Microscopy ◽  
Electron Holography ◽  
Gold Particles ◽  
Oxide Support ◽  
The Mean ◽  
A Charge

AbstractThe catalytic properties of nanostructured gold catalyst are known to depend on the size of the gold particles and to be activated when the size decreases to a few nanometers. We investigated the size dependence of the three-dimensional nanostructure on the mean inner potential of gold catalysts supported on titanium oxide using electron holography and high-resolution electron microscopy (HREM). The contact angle of the gold particles on the titanium oxide tended to be over 90° for gold particles with a size of over 5 nm, and below 90° for a size of below 2 nm. This decreasing change in the contact angle (morphology) acts to increase the perimeter and hence the area of the interface between the gold and titanium oxide support, which is considered to be an active site for CO oxidation. The mean inner potential of the gold particles also changed as their size decreased. The value of the inner potential of gold, which is approximately 25 V in bulk state, rose to over 40 V when the size of the gold particles was less than 2 nm. This phenomenon indicates the existence of a charge transfer at the interface between gold and titanium oxide. The 3-D structure change and the inner potential change should be attributed to the specific electronic structure at the interface, owing to both the “nano size effect” and the “hetero-interface effect.”

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