Cyanide leaching of Au/CeO2: highly active gold clusters for 1,3-butadiene hydrogenation

2009 ◽  
Author(s):  
Y. Guan ◽  
E. J. M. Hensen
Keyword(s):  
Gold Clusters ◽  
Cyanide Leaching ◽  
Highly Active ◽  
Butadiene Hydrogenation

Gold Clusters Alloyed to Nanoporous Palladium Surfaces as Highly Active Bimetallic Oxidation Catalysts

ChemSusChem ◽  
2013 ◽  
Vol 6 (10) ◽  
pp. 1868-1872 ◽  
Author(s):  
Yongjia Li ◽  
Enbo Zhu ◽  
Yu Chen ◽  
Chinyi Chiu ◽  
Hang Yu ◽  
...  
Keyword(s):  
Gold Clusters ◽  
Oxidation Catalysts ◽  
Highly Active

scholarly journals Catalytically Active Gold Clusters with Atomic Precision for Noninvasive Early Intervention of Neurotrauma

2021 ◽  
Author(s):  
Yunguang Zhang ◽  
Si Sun ◽  
Haile Liu ◽  
Qinjuan Ren ◽  
Wenting Hao ◽  
...  
Keyword(s):  
Early Intervention ◽  
Gold Clusters ◽  
Brain Trauma ◽  
Inflammatory Factors ◽  
Spine Injury ◽  
Noninvasive Treatment ◽  
Highly Active ◽  
External Forces

Abstract Background Neurotrauma is a head or spine injury caused by external forces. It is associated with oxidative stress, caused by the overproduction of peroxides and superoxides, and that can induce wound infection and trigger a serial of immunological reactions. The emerging catalysts have shown great potential for the treatment of brain injury and inhabiting neurogenic inflammation, but are limited to biosafety issues and delivery efficiency. Results Herein, we propose the noninvasive delivery route to brain trauma by employing highly active gold clusters with enzyme-like activity for achieving the early intervention. The ultrasmall gold clusters with unique size distribution show excellent catalytic activity with 10 times decomposition rate to H2O2. In vitro experiment shows the gold clusters can decrease the excessive O2•− and H2O2 compared with untreated cells. In vivo experiment shows gold clusters accelerate the wound healing of brain trauma and decrease the peroxide and superoxide of brain tissue. The western blot shows noninvasive treatment can decrease the inflammatory factors via inhibiting the activation of astrocytes and microglia. Conclusions Present work shows noninvasive treatment is a promising route for early intervention of brain trauma.

scholarly journals Catalytically active gold clusters with atomic precision for noninvasive early intervention of neurotrauma

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Yunguang Zhang ◽  
Si Sun ◽  
Haile Liu ◽  
Qinjuan Ren ◽  
Wenting Hao ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Early Intervention ◽  
Public Health Problem ◽  
Gold Clusters ◽  
Brain Trauma ◽  
Noninvasive Treatment ◽  
Highly Active ◽  
Secondary Damage

Abstract Background Neurotrauma is a worldwide public health problem which can be divided into primary and secondary damge. The primary damge is caused by external forces and triggers the overproduction of peroxides and superoxides, leading to long-lasting secondary damage including oxidative stress, wound infection and immunological reactions. The emerging catalysts have shown great potential in the treatment of brain injury and neurogenic inflammation, but are limited to biosafety issues and delivery efficiency. Results Herein, we proposed the noninvasive delivery route to brain trauma by employing highly active gold clusters with enzyme-like activity to achieve the early intervention. The decomposition rate to H2O2 of the ultrasmall gold clusters is 10 times that of glassy carbon (GC) electrodes, indicating excellent catalytic activity. The gold clusters can relieve the oxidative stress and decrease the excessive O2·− and H2O2 both in vitro and in vivo. Besides, gold clusters can accelerate the wound healing of brain trauma and alleviate inflammation via inhibiting the activation of astrocytes and microglia through noninvasive adminstration. decrease the peroxide and superoxide of brain tissue. Conclusions Present work shows noninvasive treatment is a promising route for early intervention of brain trauma.

scholarly journals Electrochemically dealloyed platinum with hierarchical pore structure as highly active catalytic coating

2015 ◽  
Vol 5 (1) ◽  
pp. 206-216 ◽  
Author(s):  
Ralph Kraehnert ◽  
Erik Ortel ◽  
Benjamin Paul ◽  
Bjoern Eckhardt ◽  
Michael Kanis ◽  
...  
Keyword(s):  
Pore Structure ◽  
Superior Performance ◽  
Highly Active ◽  
Hierarchical Pore Structure ◽  
Catalytic Coating ◽  
Hierarchical Pore ◽  
Pt Films ◽  
Butadiene Hydrogenation ◽  
Electrochemical Dealloying

Electrochemical dealloying of Pt–Si produces Pt films with hierarchical pore structure and superior performance in butadiene hydrogenation.

Crystal structure images of large gold clusters and growing crystals by HRTEM

1984 ◽  
Vol 42 ◽  
pp. 428-429
Author(s):  
L.R. Wallenberg ◽  
J.-O. Bovin ◽  
G. Schmid
Keyword(s):  
Crystal Structure ◽  
Nucleation And Growth ◽  
Close Packing ◽  
Gold Clusters ◽  
Molecular Weight Determination ◽  
Growth Mechanisms ◽  
Starting Point ◽  
Different Types ◽  
Nucleation And Growth Mechanisms ◽  
Points Of View

Metallic clusters are interesting from various points of view, e.g. as a mean of spreading expensive catalysts on a support, or following heterogeneous and homogeneous catalytic events. It is also possible to study nucleation and growth mechanisms for crystals with the cluster as known starting point.Gold-clusters containing 55 atoms were manufactured by reducing (C6H5)3PAuCl with B2H6 in benzene. The chemical composition was found to be Au9.2[P(C6H5)3]2Cl. Molecular-weight determination by means of an ultracentrifuge gave the formula Au55[P(C6H5)3]Cl6 A model was proposed from Mössbauer spectra by Schmid et al. with cubic close-packing of the 55 gold atoms in a cubeoctahedron as shown in Fig 1. The cluster is almost completely isolated from the surroundings by the twelve triphenylphosphane groups situated in each corner, and the chlorine atoms on the centre of the 3x3 square surfaces. This gives four groups of gold atoms, depending on the different types of surrounding.

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