Phosphinite-functionalized silica and hexagonal mesoporous silica containing palladium nanoparticles in Heck coupling reaction: synthesis, characterization, and catalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (97) ◽  
pp. 79976-79987 ◽  
Author(s):  
Fatemeh Farjadian ◽  
Majid Hosseini ◽  
Soheila Ghasemi ◽  
Bahman Tamami
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Palladium Nanoparticles ◽  
Coupling Reaction ◽  
Reaction Synthesis ◽  
Functionalized Silica ◽  
Heck Coupling ◽  
Catalytic Systems ◽  
Hexagonal Mesoporous Silica ◽  
Heterogeneous Catalytic

The preparation of phosphinite-functionalized silica and hexagonal mesoporous silica containing palladium nanoparticles is described. These catalysts were explored as heterogeneous catalytic systems in HCR with different substrates.

Palladium nanoparticles in situ synthesized on Cyclea barbata pectin as a heterogeneous catalyst for Heck coupling in water, the reduction of nitrophenols and alkynes

2021 ◽  
Author(s):  
Van-Dung Le ◽  
T. Cam-Huong Le ◽  
Van-Trung Chau ◽  
T. Ngoc-Duyen Le ◽  
Chi-Hien Dang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalyst ◽  
Palladium Nanoparticles ◽  
Coupling Reaction ◽  
Heck Coupling

This study develops an effective method for in situ synthesis of PdNPs using Cyclea barbata pectin as green reducing and stabilizing reagent. The catalytic activity of nanocomposite was evaluated for Heck coupling reaction, reduction of nitrophenols and reduction of alkynes.

Hydrogen peroxide decomposition on a two-component CuO-Cr2O3 catalyst

1988 ◽  
Vol 53 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Viliam Múčka ◽  
Kamil Lang
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Extreme Values ◽  
Catalytic Properties ◽  
Active Components ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Peroxide Decomposition ◽  
Two Component ◽  
Catalytically Active

Some physical and catalytic properties of the two-component copper(II)oxide-chromium(III)oxide catalyst with different content of both components were studied using the decomposition of the aqueous solution of hydrogen peroxide as a testing reaction. It has been found that along to both basic components, the system under study contains also the spinel structure CuCr2O4, chromate washable by water and hexavalent ions of chromium unwashable by water. The soluble chromate is catalytically active. During the first period of the reaction the equilibrium is being established in both homogeneous and heterogeneous catalytic systems. The catalytic activity as well as the specific surface area of the washed solid is a non-monotonous function of its composition. It seems highly probable that the extreme values of both these quantities are not connected with the detected admixtures in the catalytic system. The system under study is very insensitive with regard to the applied doses of gamma radiation. Its catalytic properties are changed rather significantly after the thermal treatment and particularly after the partial reduction to low degree by hydrogen. The observed changes of the catalytic activity of the system under study are very probably in connection with the changes of the valence state of the catalytically active components of the catalyst.

Palladium nanoparticles supported on 1,3-dicyclohexylguanidine functionalized mesoporous silica SBA-15 as highly active and reusable catalyst for the Suzuki–Miyaura cross-coupling reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20098-20107 ◽  
Author(s):  
Hojat Veisi ◽  
Abbas Amini Manesh ◽  
Neda Eivazi ◽  
Ali Reza Faraji
Keyword(s):  
Mesoporous Silica ◽  
Palladium Nanoparticles ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Reusable Catalyst ◽  
Suzuki Reactions ◽  
Highly Active ◽  
Functionalized Mesoporous Silica ◽  
Cross Coupling Reaction ◽  
Nano Catalyst

The synthesis and application of SBA-15/1,3-DCG/Pd as a novel heterogeneous and reusable nano catalyst in Suzuki reactions was described.

Heterogeneous Catalytic Activity of Platinum Nanoparticles Hosted in Mesoporous Silica Thin Films Modified with Polyelectrolyte Brushes

2013 ◽  
Vol 5 (18) ◽  
pp. 8833-8840 ◽  
Author(s):  
Matías Rafti ◽  
Annette Brunsen ◽  
M. Cecilia Fuertes ◽  
Omar Azzaroni ◽  
Galo J. A. A. Soler-Illia
Keyword(s):  
Thin Films ◽  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Platinum Nanoparticles ◽  
Polyelectrolyte Brushes ◽  
Heterogeneous Catalytic ◽  
Silica Thin Films

Grafting of vanadyl acetylacetonate onto organo-hexagonal mesoporous silica and catalytic activity in the allylic epoxidation of geraniol

Polyhedron ◽  
2009 ◽  
Vol 28 (5) ◽  
pp. 994-1000 ◽  
Author(s):  
Bruno Jarrais ◽  
Clara Pereira ◽  
Ana Rosa Silva ◽  
Ana P. Carvalho ◽  
João Pires ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Vanadyl Acetylacetonate ◽  
Hexagonal Mesoporous Silica

scholarly journals Facile Synthesis and Characterization of Palladium@Carbon Catalyst for the Suzuki-Miyaura and Mizoroki-Heck Coupling Reactions

2021 ◽  
Vol 11 (11) ◽  
pp. 4822
Author(s):  
Hamed M. Alshammari ◽  
Obaid F. Aldosari ◽  
Mohammad Hayal Alotaibi ◽  
Raja L. Alotaibi ◽  
Mosaed S. Alhumaimess ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Coupling Reaction ◽  
Aryl Halides ◽  
High Catalytic Activity ◽  
Coupling Reactions ◽  
Heck Coupling ◽  
Efficient Catalyst ◽  
X Ray ◽  
Suzuki Reactions

Palladium-based carbon catalysts (Pd/C) can be potentially applied as an efficient catalyst for Suzuki–Miyaura and Mizoroki–Heck coupling reactions. Herein, a variety of catalysts of palladium on activated carbon were prepared by varying the content of ‘Pd’ via an in situ reduction method, using hydrogen as a reducing agent. The as-prepared catalysts (0.5 wt % Pd/C, 1 wt % Pd/C, 2 wt % Pd/C and 3 wt % Pd/C) were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and Brunauer–Emmett–Teller (BET) analyses. The catalysts were tested as a coupling catalyst for Suzuki–Miyaura coupling reactions involving aryl halides and phenyl boronic acid. The optimization of the catalyst by varying the palladium content on the activated carbon yielded Pd/C catalysts with very high catalytic activity for Suzuki reactions of aryl halides and a Mizoroki–Heck cross-coupling reaction of 4-bromoanisol and acrylic acid in an aqueous medium. A high ‘Pd’ content and uniform ‘Pd’ impregnation significantly affected the activity of the catalysts. The catalytic activity of 3% Pd/C was found to make it a more efficient catalyst when compared with the other synthesized Pd/C catalysts. Furthermore, the catalyst reusability was also tested for Suzuki reactions by repeatedly performing the same reaction using the recovered catalyst. The 3% Pd/C catalyst displayed better reusability even after several reactions.

Sign in / Sign up

Export Citation Format

Share Document