نتایج جستجو برای: polymer supported palladium

تعداد نتایج: 297104  

Journal: :ACS Sustainable Chemistry & Engineering 2022

Herein, we report the development of an effective synthetic protocol for synthesis oxindoles in flow based on a C(sp3)–H activation process promoted by supported N-heterocyclic carbene palladium heterogeneous catalytic system using cyclopentyl methyl ether (CPME) as reaction medium. The design catalyst, selection solvent medium, and definition tailored continuous reactor have been all designed ...

2015
Xue Wang Sang-Il Choi Luke T. Roling Ming Luo Cheng Ma Lei Zhang Miaofang Chi Jingyue Liu Zhaoxiong Xie Jeffrey A. Herron Manos Mavrikakis Younan Xia

Conformal deposition of platinum as ultrathin shells on facet-controlled palladium nanocrystals offers a great opportunity to enhance the catalytic performance while reducing its loading. Here we report such a system based on palladium icosahedra. Owing to lateral confinement imposed by twin boundaries and thus vertical relaxation only, the platinum overlayers evolve into a corrugated structure...

Journal: :Molecules 2010
Ewa Mieczyńska Anna M Trzeciak

Palladium catalysts containing Pd(II) supported on Al2O3 and alumina-based mixed oxides, Al2O3-ZrO2, Al2O3-CeO2, and Al2O3-Fe2O3, are very effective in the Heck coupling of iodobenzene with cyclohexene in DMF solution. The best results, up to 81% of monoarylated products with a selectivity to 4-phenylcyclohexene (3) close to 90% were obtained with KOH as a base. The catalytic activity of pallad...

2012
Samuel Hevia Pía Homm Andrea Cortes Verónica Núñez Claudia Contreras Jenniffer Vera Rodrigo Segura

Hybrid nanostructured arrays based on carbon nanotubes (CNT) and palladium or titanium dioxide materials have been synthesized using self-supported and silicon-supported anodized aluminum oxide (AAO) as nanoporous template. It is well demonstrated that carbon nanotubes can be grown using these membranes and hydrocarbon precursors that decompose at temperatures closer to 600°C without the use of...

Journal: :Catalysis Science & Technology 2023

The selective oxidation of methane to methanol, using in situ generated H 2 O has been investigated a series TS-1 supported palladium-based catalysts, with the introduction Au or Ni considerably improving catalytic performance.

Journal: :The Journal of organic chemistry 2006
Fanlong Zeng Zhengkun Yu

Palladium complexes of two new types of unsymmetrical pyridyl-supported pyrazolyl-N-heterocyclic carbene ligands were synthesized and structurally characterized. A strategy to release the steric strain of the ligand was realized by the introduction of methylene linkers to the ligand molecule. All the palladium complexes exhibited good to excellent catalytic activity in Suzuki-Miyaura reactions ...

2014
Panagiotis Grammatikopoulos Cathal Cassidy Vidyadhar Singh Mukhles Sowwan

Palladium nanoparticles offer an attractive alternative to bulk palladium for catalysis, hydrogen storage and gas sensing applications. Their performance depends strongly on surface structure; therefore, nanoparticle coalescence can play an important role, as it determines the resultant structure of the active sites where reactions (e.g. catalysis) actually take place, i.e. facets, edges, verti...

2013
Mohammad Ali Rasouli Parviz Rashidi Ranjbar

Palladium nanoparticles supported on cellulose were prepared without using any reducing agent and used as a highly efficient catalyst for the Ullmann reductive coupling of aryl halides in the presence of zinc, in a water-alcohol mixture as solvent in air. The obtained palladium nanoparticles were characterized by scanning electron microscopy (SEM), FTIR, thermogravimetric analysis (TGA) and ICP...

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