Identification of the Active Species Generated from Supported Pd Catalysts in Heck Reactions: An in situ Quick Scanning EXAFS Investigation

2011 ◽  
Vol 133 (11) ◽  
pp. 3921-3930 ◽  
Author(s):  
Sven Reimann ◽  
Jan Stötzel ◽  
Ronald Frahm ◽  
Wolfgang Kleist ◽  
Jan-Dierk Grunwaldt ◽  
...  
Keyword(s):  
Active Species ◽  
Heck Reactions ◽  
Pd Catalysts ◽  
Supported Pd Catalysts ◽  
Supported Pd

scholarly journals On the effect of metal loading on the reducibility and redox chemistry of ceria supported Pd catalysts

2021 ◽  
Author(s):  
Adam Hugh Clark ◽  
Huw Marchbank ◽  
David Thompsett ◽  
Janet Fisher ◽  
Alessandro Longo ◽  
...  
Keyword(s):  
Redox Chemistry ◽  
X Ray Diffraction ◽  
Pd Catalysts ◽  
X Ray ◽  
Metal Loading ◽  
Supported Pd Catalysts ◽  
Effect Of Pd ◽  
Supported Pd

The effect of Pd loading on the redox characteristics of ceria was examined using in situ Pd K-edge XAS, Ce L3-edge XAS and in situ X-ray diffraction techniques. Analysis of...

INFLUENCE OF PRETREATMENT ON THE STRUCTURAL AND CATALYTIC PROPERTIES OF SUPPORTED Pd CATALYSTS FOR CO OXIDATION

2013 ◽  
Vol 20 (02) ◽  
pp. 1350013 ◽  
Author(s):  
CUN WEN ◽  
YI LIU ◽  
YUN GUO ◽  
YANQIN WANG ◽  
GUANZHONG LU
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Catalytic Properties ◽  
Active Oxygen Species ◽  
Pd Catalysts ◽  
Pd Dispersion ◽  
Supported Pd Catalysts ◽  
In Situ Drift ◽  
Supported Pd

The effects of pretreating atmospheres ( H2 , O2 and Ar ) on the activity for CO oxidation and Pd dispersion of Pd/Pr6O11 catalyst were investigated. The result shows after the Pd/Pr6O11 catalyst was pretreated by hydrogen or oxygen at 550°C, its catalytic activity for CO oxidation can obviously increase, and the activity of H2 -pretreated catalyst is superior to that of O2 -pretreated catalyst, which is attributed to an increase of Pd dispersion. The catalyst pretreated by Ar behaves the worst catalytic activity for CO oxidation. The results of CO pulse, CO chemisorption and in situ DRIFT testing indicate that the surface species (hydroxyl species or active oxygen species) generated during pretreating processes can prevent Pd particles from immigrating and sintering, resulting in an increase of the Pd dispersion on the surface of support.

Phenol In Situ Hydrogenation with Carbon Nanotube-Supported Pd Catalyst

2014 ◽  
Vol 934 ◽  
pp. 60-64 ◽  
Author(s):  
Ling Niao Kong ◽  
Ya Ru Huang ◽  
Yin Jun Fang
Keyword(s):  
Activated Carbon ◽  
Carbon Nanotube ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Pd Catalyst ◽  
Pd Catalysts ◽  
Metal Precursor ◽  
Supported Pd Catalysts ◽  
Supported Pd

Carbon nanotube (CNT) and activated carbon (AC)-supported Pd catalysts have been prepared by impregnation and reduction-precipitation method using chloropalladate acid as metal precursor. The catalytic performance for phenol in-situ hydrogenation was evaluated under 493 K, 3.5MPa. The results show that Pd/CNTs catalyst has higher selective for phenol in-situ hydrogenation to cyclohexanone. The catalysts have been characterised by CO-TPD and TEM. The mesoporosity structure and inner hollow cavities of Pd/CNTs catalyst are responsible for the distinguished properties.

Reaction pathways for the HDO of guaiacol over supported Pd catalysts: Effect of support type in the deoxygenation of hydroxyl and methoxy groups

2021 ◽  
pp. 111491
Author(s):  
Camila A. Teles ◽  
Priscilla M. de Souza ◽  
Raimundo C. Rabelo-Neto ◽  
Alejandra Teran ◽  
Gary Jacobs ◽  
...  
Keyword(s):  
Reaction Pathways ◽  
Pd Catalysts ◽  
Supported Pd Catalysts ◽  
Methoxy Groups ◽  
Effect Of Support ◽  
Supported Pd

Characterization and Reactivity of Alumina-Supported Pd Catalysts for the Room-Temperature Hydrodechlorination of Chlorobenzene

2007 ◽  
Vol 111 (17) ◽  
pp. 6447-6453 ◽  
Author(s):  
N. Seshu Babu ◽  
N. Lingaiah ◽  
Rajesh Gopinath ◽  
P. Siva Sankar Reddy ◽  
P. S. Sai Prasad
Keyword(s):  
Room Temperature ◽  
Pd Catalysts ◽  
Supported Pd Catalysts ◽  
Supported Pd

Recyclable polymer-supported Pd catalysts for aryl amination reactions

2005 ◽  
Vol 46 (43) ◽  
pp. 7363-7366 ◽  
Author(s):  
Meritxell Guinó ◽  
King Kuok (Mimi) Hii
Keyword(s):  
Pd Catalysts ◽  
Aryl Amination ◽  
Supported Pd Catalysts ◽  
Polymer Supported ◽  
Supported Pd
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