scholarly journals Development of titanium oxide-supported palladium catalysts and evaluation of the catalyst activities for ligand-free Suzuki–Miyaura coupling using aryl chlorides

2020 ◽  
Author(s):  
Tsuyoshi Yamada
Keyword(s):  
Titanium Oxide ◽  
Palladium Catalysts ◽  
Aryl Chlorides ◽  
Supported Palladium Catalysts ◽  
Ligand Free ◽  
Supported Palladium

scholarly journals Development of Titanium Dioxide-Supported Pd Catalysts for Ligand-Free Suzuki–Miyaura Coupling of Aryl Chlorides

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 461 ◽  
Author(s):  
Yamada ◽  
Masuda ◽  
Park ◽  
Tachikawa ◽  
Ito ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Palladium Catalysts ◽  
Catalyst Activity ◽  
Acetonitrile Solution ◽  
Palladium Acetate ◽  
Tio2 Anatase ◽  
Aryl Chlorides ◽  
Donation Process ◽  
Ligand Free ◽  
Supported Pd

The catalyst activities of various heterogeneous palladium catalysts supported by anatase-, rutile- and brookite-type titanium oxide for ligand-free Suzuki–Miyaura cross-coupling reactions of aryl chlorides were evaluated. Palladium acetate [Pd(OAc)2], supported on anatase-type titanium oxide (TiO2) via acetonitrile solution impregnation process without reduction [Pd/TiO2 (anatase-type)], demonstrated the highest catalyst activity in comparison to those of other titanium oxide (rutile- or brookite-type) supported Pd(OAc)2 without reduction and reduced Pd/TiO2 (anatase-type) [Pd(red)/TiO2 (anatase-type)]. Various aryl chloride and bromide derivatives were smoothly coupled with arylboronic acids including heteroarylboronic acids in the presence of 5–10 mol% Pd/TiO2 (anatase-type) without the addition of any ligands. Although the fresh Pd/TiO2 (anatase-type) catalyst was surprisingly comprised of ca. 1:2 mixture of palladium(II) and palladium(0) species according to X-ray photoelectron spectroscopy (XPS), in spite of no reduction process, significant further increment of palladium(0) species was observed during the Suzuki–Miyaura coupling reaction, and Pd/TiO2 (anatase-type) was converted into a catalyst, which contained palladium(0) species as the main component [ca. 1:5 mixture of palladium(II) and palladium(0) species]. Therefore, the reduction via the electron donation process to the palladium(II) species may have occurred during the reaction on anatase-type titanium oxide.

Highly Efficient and Reusable Polyaniline-Supported Palladium Catalysts for Open-Air Oxidative Heck Reactions under Base- and Ligand-Free Conditions

2008 ◽  
Vol 350 (13) ◽  
pp. 1968-1974 ◽  
Author(s):  
Pravin R. Likhar ◽  
Moumita Roy ◽  
Sarabindu Roy ◽  
M. S. Subhas ◽  
M. Lakshmi Kantam ◽  
...  
Keyword(s):  
Palladium Catalysts ◽  
Heck Reactions ◽  
Supported Palladium Catalysts ◽  
Highly Efficient ◽  
Ligand Free ◽  
Supported Palladium

scholarly journals Nanostructured supported palladium catalysts—Non-oxidative methane coupling

2012 ◽  
Vol 411-412 ◽  
pp. 105-113 ◽  
Author(s):  
Silvia F. Moya ◽  
Ruth L. Martins ◽  
Antje Ota ◽  
Edward L. Kunkes ◽  
Malte Behrens ◽  
...  
Keyword(s):  
Palladium Catalysts ◽  
Methane Coupling ◽  
Supported Palladium Catalysts ◽  
Oxidative Methane Coupling ◽  
Supported Palladium

Particle size effects in the selective hydrogenation of cinnamaldehyde over supported palladium catalysts

RSC Advances ◽  
2016 ◽  
Vol 6 (79) ◽  
pp. 75541-75551 ◽  
Author(s):  
Feng Jiang ◽  
Jian Cai ◽  
Bing Liu ◽  
Yuebing Xu ◽  
Xiaohao Liu
Keyword(s):  
Particle Size ◽  
Size Effect ◽  
Selective Hydrogenation ◽  
Size Effects ◽  
Palladium Catalysts ◽  
Particle Size Effect ◽  
Particle Size Effects ◽  
Supported Palladium Catalysts ◽  
Supported Palladium ◽  
Palladium Particles

Palladium particles of different sizes obtained directly and indirectly by various methods were studied to clarify the particle size effect in the selective hydrogenation of cinnamaldehyde (CAL).

Non-stationary effects during conversion of synthesis gas containing added oxygen over supported palladium catalysts

1993 ◽  
Vol 28 (4) ◽  
pp. 283-285
Author(s):  
G. V. Filonenko ◽  
T. M. Shaprinskaya ◽  
Yu. I. Pyatnitskii ◽  
V. P. Stasevich ◽  
V. I. Gritsenko
Keyword(s):  
Synthesis Gas ◽  
Palladium Catalysts ◽  
Supported Palladium Catalysts ◽  
Supported Palladium

Methane oxidation on alumina supported palladium catalysts: Effect of Pd precursor and solvent

2009 ◽  
Vol 370 (1-2) ◽  
pp. 78-87 ◽  
Author(s):  
N.M. Kinnunen ◽  
M. Suvanto ◽  
M.A. Moreno ◽  
A. Savimäki ◽  
K. Kallinen ◽  
...  
Keyword(s):  
Methane Oxidation ◽  
Palladium Catalysts ◽  
Supported Palladium Catalysts ◽  
Supported Palladium ◽  
Effect Of Pd
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