scholarly journals Impregnated palladium on magnetite as a water compatible catalyst for the cycloisomerization of alkynoic acid derivatives

2018 ◽  
Vol 20 (9) ◽  
pp. 2151-2157 ◽  
Author(s):  
Beatriz Saavedra ◽  
Juana M. Pérez ◽  
María J. Rodríguez-Álvarez ◽  
Joaquín García-Álvarez ◽  
Diego J. Ramón
Keyword(s):  
Catalytic Activity ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Metal Catalyst

This work describes the catalytic activity of palladium(ii) species in the cycloisomerization of alkynoic acids and their derivatives in aqueous media as well as in Deep Eutectic Solvents (DESs), with one of the lowest metal catalyst loadings reported so far in the literature.

scholarly journals Development of Effective Lipase-Hybrid Nanoflowers Enriched with Carbon and Magnetic Nanomaterials for Biocatalytic Transformations

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 808 ◽  
Author(s):  
Renia Fotiadou ◽  
Michaela Patila ◽  
Mohamed Amen Hammami ◽  
Apostolos Enotiadis ◽  
Dimitrios Moschovas ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Immobilized Lipase ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Operational Stability ◽  
Magnetic Nanomaterials ◽  
Energy Dispersion Spectroscopy ◽  
Simple Method ◽  
Pseudozyma Antarctica ◽  
Carbon Based Nanomaterials

In the present study, hybrid nanoflowers (HNFs) based on copper (II) or manganese (II) ions were prepared by a simple method and used as nanosupports for the development of effective nanobiocatalysts through the immobilization of lipase B from Pseudozyma antarctica. The hybrid nanobiocatalysts were characterized by various techniques including scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The effect of the addition of carbon-based nanomaterials, namely graphene oxide and carbon nanotubes, as well as magnetic nanoparticles such as maghemite, on the structure, catalytic activity, and operational stability of the hybrid nanobiocatalysts was also investigated. In all cases, the addition of nanomaterials during the preparation of HNFs increased the catalytic activity and the operational stability of the immobilized biocatalyst. Lipase-based magnetic nanoflowers were effectively applied for the synthesis of tyrosol esters in non-aqueous media, such as organic solvents, ionic liquids, and environmental friendly deep eutectic solvents. In such media, the immobilized lipase preserved almost 100% of its initial activity after eight successive catalytic cycles, indicating that these hybrid magnetic nanoflowers can be applied for the development of efficient nanobiocatalytic systems.

TiO2 nanoparticles coated with deep eutectic solvents: characterization and effect on photodegradation of organic dyes

2019 ◽  
Vol 43 (3) ◽  
pp. 1415-1423 ◽  
Author(s):  
Bruna L. Kuhn ◽  
Guilherme C. Paveglio ◽  
Siara Silvestri ◽  
Edson I. Muller ◽  
Michele S. P. Enders ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Tio2 Nanoparticles ◽  
Organic Dyes ◽  
Deep Eutectic Solvents

Deep eutectic solvents (DES) have been used to modulate the catalytic activity of TiO2 nanoparticles.

Palladium-Schiff-base-silica framework as a robust and recyclable catalyst for Suzuki–Miyaura cross-coupling in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (48) ◽  
pp. 38085-38092 ◽  
Author(s):  
Tahshina Begum ◽  
Manoj Mondal ◽  
Pradip K. Gogoi ◽  
Utpal Bora
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Room Temperature ◽  
Aqueous Media ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Recyclable Catalyst ◽  
Cross Coupling Reaction

A novel Pd@imine-SiO2 catalyst was prepared and found to exhibit excellent catalytic activity in a Suzuki-Miyaura cross-coupling reaction under aqueous media at room temperature.

scholarly journals Recent Progress of Cu-Catalyzed Azide-Alkyne Cycloaddition Reactions (CuAAC) in Sustainable Solvents: Glycerol, Deep Eutectic Solvents, and Aqueous Media

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2015 ◽  
Author(s):  
Noel Nebra ◽  
Joaquín García-Álvarez
Keyword(s):  
Recent Progress ◽  
Copper Catalyst ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Dipolar Cycloaddition ◽  
Green Solvents ◽  
Sustainable Solvents ◽  
Volatile Organic ◽  
Water Glycerol ◽  
Reaction Media

This mini-review presents a general overview of the progress achieved during the last decade on the amalgamation of CuAAC processes (copper-catalyzed azide-alkyne cycloaddition) with the employment of sustainable solvents as reaction media. In most of the presented examples, the use of water, glycerol (Gly), or deep eutectic solvents (DESs) as non-conventional reaction media allowed not only to recycle the catalytic system (thus reducing the amount of the copper catalyst needed per mole of substrate), but also to achieve higher conversions and selectivities when compared with the reaction promoted in hazardous and volatile organic solvents (VOCs). Moreover, the use of the aforementioned green solvents also permits the improvement of the overall sustainability of the Cu-catalyzed 1,3-dipolar cycloaddition process, thus fulfilling several important principles of green chemistry.

scholarly journals Metal Exsolution to Enhance the Catalytic Activity of Electrodes in Solid Oxide Fuel Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2445
Author(s):  
Tianyu Cao ◽  
Ohhun Kwon ◽  
Raymond J. Gorte ◽  
John M. Vohs
Keyword(s):  
Catalytic Activity ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Catalytic Properties ◽  
Solid Oxide ◽  
Metal Particles ◽  
Metal Catalyst ◽  
Oxide Fuel ◽  
Novel Technology ◽  
Metal Incorporation

Exsolution is a novel technology for attaching metal catalyst particles onto ceramic anodes in the solid oxide fuel cells (SOFCs). The exsolved metal particles in the anode exhibit unique properties for reaction and have demonstrated remarkable stabilities under conditions that normally lead to coking. Despite extensive investigations, the underlying principles behind exsolution are still under investigation. In this review, the present status of exsolution materials for SOFC applications is reported, including a description of the fundamental concepts behind metal incorporation in oxide lattices, a listing of proposed mechanisms and thermodynamics of the exsolution process and a discussion on the catalytic properties of the resulting materials. Prospects and opportunities to use materials produced by exsolution for SOFC are discussed.

Catalytic activity of Fe/AC, obtained by impregnation of activated carbon in aqueous and non-aqueous media, to neutralize NO

2007 ◽  
Vol 16 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Daniela Stoyanova ◽  
Radostin Nickolov ◽  
Mariana Khristova ◽  
Daniela Paneva ◽  
Dimitar Mehandjiev
Keyword(s):  
Catalytic Activity ◽  
Activated Carbon ◽  
Aqueous Media

scholarly journals Pt-Sn Supported on Beta Zeolite with Enhanced Activity and Stability for Propane Dehydrogenation

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
Su-Un Lee ◽  
You-Jin Lee ◽  
Soo-Jin Kwon ◽  
Jeong-Rang Kim ◽  
Soon-Yong Jeong
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
High Surface ◽  
Coke Formation ◽  
Propane Dehydrogenation ◽  
Coke Deposition ◽  
Beta Zeolite ◽  
Lower Amount ◽  
Metal Catalyst ◽  
Beta Zeolites

With the growing global propylene demand, propane dehydrogenation (PDH) has attracted great attention for on-purpose propylene production. However, its industrial application is limited because catalysts suffer from rapid deactivation due to coke deposition and metal catalyst sintering. To enhance metal catalyst dispersion and coke resistance, Pt-based catalysts have been widely investigated with various porous supports. In particular, zeolite can benefit from large surface area and acid sites, which favors high metal dispersion and promoting catalytic activity. In this work, we investigated the PDH catalytic properties of Beta zeolites as a support for Pt-Sn based catalysts. In comparison with Pt-Sn supported over θ-Al2O3 and amorphous silica (Q6), Beta zeolite-supported Pt-Sn catalysts exhibited a different reaction trend, achieving the best propylene selectivity after a proper period of reaction time. The different PDH catalytic behavior over Beta zeolite-supported Pt-Sn catalysts has been attributed to their physicochemical properties and reaction mechanism. Although Pt-Sn catalyst supported over Beta zeolite with low acidity showed low Pt dispersion, it formed a relatively lower amount of coke on PDH reaction and maintained a high surface area and active Pt surfaces, resulting in enhanced stability for PDH reaction. This work can provide a better understanding of zeolite-supported Pt-Sn catalysts to improve PDH catalytic activity with high selectivity and low coke formation.

ChemInform Abstract: Pd Nanoparticles Dispersed on Solid Supports: Synthesis, Characterization and Catalytic Activity on Selective Hydrogenation of Olefins in Aqueous Media.

ChemInform ◽  
2011 ◽  
Vol 42 (16) ◽  
pp. no-no
Author(s):  
Minkyung Lim ◽  
Kathlia A. De Castro ◽  
Seungchan Oh ◽  
Kangsuk Lee ◽  
Young-Wook Chang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Aqueous Media ◽  
Pd Nanoparticles ◽  
Solid Supports
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