Accessing stable zirconium carboxy-aminophosphonate nanosheets as support for highly active Pd nanoparticles

2015 ◽  
Vol 51 (88) ◽  
pp. 15990-15993 ◽  
Author(s):  
Ferdinando Costantino ◽  
Riccardo Vivani ◽  
Maria Bastianini ◽  
Luca Ortolani ◽  
Oriana Piermatti ◽  
...  
Keyword(s):  
Catalytic System ◽  
Zirconium Phosphate ◽  
Suzuki Coupling ◽  
Pd Nanoparticles ◽  
Highly Active

PdNPs stabilized on exfoliated layered zirconium phosphate–carboxyphosphonate nanosheets as an efficient catalytic system for the Suzuki coupling.

scholarly journals Microwave-Assisted Synthesis of Pd Nanoparticles and Catalysis Application for Suzuki Coupling Reactions

2017 ◽  
Vol 11 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Jian Zhang ◽  
Xuefeng Bai
Keyword(s):  
Chemical Reduction ◽  
Phenylboronic Acid ◽  
Suzuki Coupling ◽  
Pd Nanoparticles ◽  
Xrd Analysis ◽  
Microwave Assisted Synthesis ◽  
Coupling Reactions ◽  
Microwave Assisted ◽  
Highly Active ◽  
Aryl Bromides

A facile and efficient method was developed for the synthesis of highly active palladium nanoparticles (PdNPs) by microwave-assisted chemical reduction. The PdNPs with different morphology were prepared with or without KBr (capping agent) using ethylene glycol (EG) and citric acid (CA) as reducing agent in the presence of polyvinylpyrrolidone (PVP), respectively. The as-prepared PdNPs were characterized by (UV-Visible Spectrophotometer) UV-Vis, transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis. The results showed that the PdNPs reduced by EG without KBr (PdNPs-EG) has smaller particle size than other PdNPs. The remarkable catalytic activity of the PdNPs catalysts are obtained using a low amount of PdNPs (0.1 mmol‰) using K2CO3 as base and EtOH/H2O as solvent toward Suzuki coupling reactions of aryl bromides and phenylboronic acid for 15 min.

scholarly journals Engineering of highly active Au/Pd supported on hydrogenated urchin-like yolk@shell TiO2 for visible light photocatalytic Suzuki coupling

2019 ◽  
Vol 9 (14) ◽  
pp. 3820-3827 ◽  
Author(s):  
Sahar Rohani ◽  
Abolfazl Ziarati ◽  
Ghodsi Mohammadi Ziarani ◽  
Alireza Badiei ◽  
Thomas Burgi
Keyword(s):  
Visible Light ◽  
Suzuki Coupling ◽  
Pd Nanoparticles ◽  
Highly Active ◽  
Visible Light Photocatalytic

An engineered hydrogenated urchin-like yolk@shell TiO2 structure decorated with Au/Pd nanoparticles was designed via sequential steps and employed in visible light photocatalytic Suzuki coupling.

Deactivation of arenetitanium(II) bromoalane complexes in the cyclotrimerization of butadiene

1986 ◽  
Vol 51 (12) ◽  
pp. 2751-2759 ◽  
Author(s):  
Jindřich Poláček ◽  
Helena Antropiusová ◽  
Lidmila Petrusová ◽  
Karel Mach
Keyword(s):  
Catalytic Activity ◽  
Catalytic System ◽  
Model System ◽  
Highly Active ◽  
Catalytic Stability

The C6H6.Ti(II)(AlBr4)2 (Ib) catalyst deactivates during the butadiene cyclotrimerization to give a solid containing all titanium (mostly as TiBr3) and a mixture of AlBr3 and RAlBr2 compounds dissolved in benzene. The residual cationic catalytic activity of the deactivated Ib system is due to presence of AlBr3. In contrast to TiCl3, the deactivated Ib system and the model system TiBr3 + AlBr3 are not activated by the addition of EtAlCl2 in the presence of butadiene: the highly active benzenetitanium(II) system is re-constituted only after reduction of TiBr3 with Et3Al followed by the addition of EtAlCl2. The addition of Et2AlBr to Ib accelerates the deactivation of the system. Deactivation products of this system contain mainly Ti(II) species which forms benzenetitanium(II) catalytic system after addition of EtAlCl2. All the EtAlCl2 reactivated systems produce (Z, E, E)-1,5,9-cyclododecatriene with high catalytic stability and considerable selectivity (>90%). This behaviour points to the catalysis by benzenetitanium(II) chloroalane complexes containing only low amount of bromine atoms and ethyl groups.

scholarly journals Highly Dispersed Pd Species Supported on CeO2 Catalyst for Lean Methane Combustion: The Effect of the Occurrence State of Surface Pd Species on the Catalytic Activity

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 772
Author(s):  
Yanxiong Liu ◽  
Changhua Hu ◽  
Longchun Bian
Keyword(s):  
Catalytic Activity ◽  
Oxygen Vacancies ◽  
Methane Combustion ◽  
Pd Nanoparticles ◽  
High Concentration ◽  
Ch4 Combustion ◽  
Highly Active ◽  
Δ Phase ◽  
Occurrence State ◽  
Comprehensive Characterization

The correlation between the occurrence state of surface Pd species of Pd/CeO2 for lean CH4 combustion is investigated. Herein, by using a reduction-deposition method, we have synthesized a highly active 0.5% PdO/CeO2-RE catalyst, in which the Pd nanoparticles are evenly dispersed on the CeO2 nanorods CeO2-R. Based on comprehensive characterization, we have revealed that the uniformly dispersed Pd nanoparticles with a particle size distribution of 2.3 ± 0.6 nm are responsible for the generation of PdO and PdxCe1−xO2−δ phase with –Pd2+–O2−–Ce4+– linkage, which can easily provide oxygen vacancies and facilitate the transfer of reactive oxygen species between the CeO2-R and Pd species. As a consequence, the remarkable catalytic activity of 0.5% Pd/CeO2-RE is related to the high concentration of PdO species on the surface of the catalyst and the synergistic interaction between the Pd species and the CeO2 nanorod.

Sodium complexes bearing cavity-like conformations: a highly active and well-controlled catalytic system for macrolactone homo- and copolymerization

2021 ◽  
Vol 12 (13) ◽  
pp. 1957-1966
Author(s):  
Xinya Wang ◽  
Xiaohua Wang ◽  
Nuo Zhen ◽  
Jin Gu ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Catalytic System ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Highly Active ◽  
Sodium Complexes

Sodium complexes displaying cavity-like conformations and, therefore, suppressed transesterification during the ring-opening polymerization of pentadecalactone are disclosed herein.

Elucidation of the Structure of a Highly Active Catalytic System for CO2/Epoxide Copolymerization: A salen-Cobaltate Complex of an Unusual Binding Mode

2009 ◽  
Vol 48 (21) ◽  
pp. 10455-10465 ◽  
Author(s):  
Sung Jae Na ◽  
Sujith S ◽  
Anish Cyriac ◽  
Bo Eun Kim ◽  
Jina Yoo ◽  
...  
Keyword(s):  
Catalytic System ◽  
Binding Mode ◽  
Highly Active
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