scholarly journals A silica-based magnetic platform decorated with mixed ligand gold nanoparticles: a recyclable catalyst for esterification reactions

2016 ◽  
Vol 52 (32) ◽  
pp. 5573-5576 ◽  
Author(s):  
Elif Ertem ◽  
Nerea Murillo-Cremaes ◽  
Randy Patrick Carney ◽  
Anna Laromaine ◽  
Emma-Rose Janeček ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Benzyl Alcohol ◽  
Mixed Ligand ◽  
Recyclable Catalyst ◽  
Benzyl Acetate ◽  
Recoverable Catalysts ◽  
Esterification Reactions

We have developed hierarchical Fe2O3@SiO2@Au nanospheres and we have demonstrated their use as efficient and easily recoverable catalysts in the conversion of benzyl alcohol to benzyl acetate.

scholarly journals Influence of Co-Precipitation Agent on the Structure, Texture and Catalytic Activity of Au-CeO2 Catalysts in Low-Temperature Oxidation of Benzyl Alcohol

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 641
Author(s):  
Lukasz Wolski ◽  
Grzegorz Nowaczyk ◽  
Stefan Jurga ◽  
Maria Ziolek
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Benzyl Alcohol ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Key Factor ◽  
Au Particle Size ◽  
Co Precipitation

The aim of the study was to establish the influence of a co-precipitation agent (i.e., NaOH–immediate precipitation; hexamethylenetetramine/urea–gradual precipitation and growth of nanostructures) on the properties and catalytic activity of as-synthesized Au-CeO2 nanocomposites. All catalysts were fully characterized with the use of XRD, nitrogen physisorption, ICP-OES, SEM, HR-TEM, UV-vis, XPS, and tested in low-temperature oxidation of benzyl alcohol as a model oxidation reaction. The results obtained in this study indicated that the type of co-precipitation agent has a significant impact on the growth of gold species. Immediate co-precipitation of Au-CeO2 nanostructures with the use of NaOH allowed obtainment of considerably smaller and more homogeneous in size gold nanoparticles than those formed by gradual co-precipitation and growth of Au-CeO2 nanostructures in the presence of hexamethylenetetramine or urea. In the catalytic tests, it was established that the key factor promoting high activity in low-temperature oxidation of benzyl alcohol was size of gold nanoparticles. The highest conversion of the alcohol was observed for the catalyst containing the smallest Au particle size (i.e., Au-CeO2 nanocomposite prepared with the use of NaOH as a co-precipitation agent).

Effect of Composition on the Catalytic Properties of Mixed-Ligand-Coated Gold Nanoparticles

2011 ◽  
Vol 123 (34) ◽  
pp. 8046-8051 ◽  
Author(s):  
Anirban Ghosh ◽  
Soubir Basak ◽  
Benjamin H. Wunsch ◽  
Rajiv Kumar ◽  
Francesco Stellacci
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Properties ◽  
Mixed Ligand

Gold nanoparticles on mesoporous Cerium-Tin mixed oxide for aerobic oxidation of benzyl alcohol

2016 ◽  
Vol 418-419 ◽  
pp. 41-53 ◽  
Author(s):  
Chiranjit Santra ◽  
Malay Pramanik ◽  
Kyoko K. Bando ◽  
Sudip Maity ◽  
Biswajit Chowdhury
Keyword(s):  
Gold Nanoparticles ◽  
Benzyl Alcohol ◽  
Mixed Oxide ◽  
Aerobic Oxidation ◽  
Oxidation Of Benzyl Alcohol

Magnetically recoverable catalysts based on mono- or bis-(NHC) complexes of palladium for the Suzuki–Miyaura reaction in aqueous media: two NHC–Pd linkages are better than one

2016 ◽  
Vol 45 (29) ◽  
pp. 11633-11638 ◽  
Author(s):  
Francisco Martínez-Olid ◽  
Román Andrés ◽  
Ernesto de Jesús ◽  
Juan C. Flores ◽  
Pilar Gómez-Sal ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Aqueous Media ◽  
Recyclable Catalyst ◽  
Magnetically Recoverable Catalysts ◽  
Recoverable Catalysts ◽  
Pd Complexes ◽  
Better Than

Mono- and bis(NHC) Pd complexes grafted onto magnetic particles are compared as catalysts in the Suzuki–Miyaura reaction in aqueous media. The latter is found to be an outstanding recyclable catalyst.

Palladium in Heterogeneous Oxidation Catalysis

2016 ◽  
pp. 53-81
Author(s):  
Andreas Martin ◽  
Venkata Narayana Kalevaru ◽  
Jörg Radnik
Keyword(s):  
Benzyl Alcohol ◽  
Molecular Oxygen ◽  
Palladium Catalysts ◽  
Deep Understanding ◽  
Oxidation Catalysis ◽  
Benzyl Acetate ◽  
Heterogeneous Oxidation ◽  
Hydrogenation Reactions ◽  
Gas Phase Oxidation ◽  
Common Application

Palladium is one of the precious group metals mainly used in automobile catalytic converters. Besides, it has an importance in various catalytic processes. Although it is well known for hydrogenation reactions, various oxidations can also be catalyzed by palladium. This chapter gives an overview on the most common application of palladium catalysts in heterogeneously catalyzed acetoxylation, i.e. the acetoxylation of ethylene to vinyl acetate. Derived from this knowledge, the authors summarize in detail recently accumulated research results in acetoxylation of toluene to benzyl acetate that can be easily converted to benzyl alcohol. The chapter includes a detailed description of catalyst syntheses, gas phase oxidation runs, comprehensive characterizations and a deep understanding in catalyst-feed interaction. This development can turn away the manufacture of important petrochemicals from chlorine chemistry to oxidations using molecular oxygen.

Comparative STM studies of mixed ligand monolayers on gold nanoparticles in air and in 1-phenyloctane

2014 ◽  
Vol 50 (72) ◽  
pp. 10456-10459 ◽  
Author(s):  
Quy Khac Ong ◽  
Shun Zhao ◽  
Javier Reguera ◽  
Fabio Biscarini ◽  
Francesco Stellacci
Keyword(s):  
Gold Nanoparticles ◽  
Characteristic Length ◽  
Mixed Ligand ◽  
Scanning Tunnelling Microscopy ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

Scanning tunnelling microscopy (STM) studies have found that stripe-like domains on gold nanoparticles (NPs) have the same characteristic length in air and in 1-phenyloctane.

Sign in / Sign up

Export Citation Format

Share Document