The big effect of a small change: formation of CuO nanoparticles instead of covalently bound Cu(ii) over functionalized mesoporous silica and its impact on catalytic efficiency

2020 ◽  
Vol 49 (29) ◽  
pp. 10138-10155
Author(s):  
Trisha Das ◽  
Debdas Singha ◽  
Mahasweta Nandi
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Catalytic Efficiency ◽  
Cuo Nanoparticles ◽  
Functionalized Mesoporous Silica ◽  
Small Change ◽  
Covalently Bound

Covalently bound copper(ii) and CuO nanoparticles on mesoporous silica have been prepared by changing the addition sequence of reagents; the latter shows better catalytic activity.

RhNPs supported on N-functionalized mesoporous silica: effect on catalyst stabilization and catalytic activity

2021 ◽  
Author(s):  
Israel T. Pulido-Díaz ◽  
Alejandro Serrano-Maldonado ◽  
Carlos César López-Suárez ◽  
Pedro A. Méndez-Ocampo ◽  
Benjamín Portales-Martínez ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Functional Groups ◽  
Hydrogenation Catalysts ◽  
Functionalized Mesoporous Silica ◽  
Catalyst Stabilization ◽  
Shape And Size

RhNPs supported on mesoporous silica functionalized with nicotinamide groups provided active hydrogenation catalysts for several functional groups, wherein the shape and size of the RhNPs are maintained after catalysis.

scholarly journals In situ synthesis of CuO nanoparticles over functionalized mesoporous silica and their application in catalytic syntheses of symmetrical diselenides

2019 ◽  
Vol 48 (48) ◽  
pp. 17874-17886 ◽  
Author(s):  
Trisha Das ◽  
Rana Chatterjee ◽  
Adinath Majee ◽  
Hiroshi Uyama ◽  
David Morgan ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
In Situ Synthesis ◽  
Cuo Nanoparticles ◽  
Functionalized Mesoporous Silica ◽  
Cuo Nanoparticle ◽  
Nanoparticle Catalyst

A versatile and novel mesoporous silica supported CuO nanoparticle catalyst (nCuO-FMS) and its application in the syntheses of symmetrical diselenides.

scholarly journals Synthesis, Characterization, and Catalytic Activity of Pd(II) Salen-Functionalized Mesoporous Silica

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Rotcharin Sawisai ◽  
Ratchaneekorn Wanchanthuek ◽  
Widchaya Radchatawedchakoon ◽  
Uthai Sakee
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Silica Gel ◽  
Palladium Catalysts ◽  
Nitrogen Adsorption ◽  
Significant Loss ◽  
X Ray ◽  
Heterogeneous Catalytic ◽  
Functionalized Mesoporous Silica ◽  
Mesoporous Silica Gel

Salen ligand synthesized from 2-hydroxybenzaldehyde and 2-hydroxy-1-naphthaldehyde was used as a palladium chelating ligand for the immobilization of the catalytic site. Mesoporous silica supported palladium catalysts were prepared by immobilizing Pd(OAc)2 onto a mesoporous silica gel through the coordination of the imine-functionalized mesoporous silica gel. The prepared catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), inductivity couple plasma (ICP), nitrogen adsorption-desorption, and Fourier transform infrared (FT-IR) spectroscopy. The solid catalysts showed higher activity for the hydroamination of C-(tetra-O-acetyl-β-D-galactopyranosyl)allene with aromatic amines compared with the corresponding homogenous catalyst. The heterogeneous catalytic system can be easily recovered by simple filtration and reused for up to five cycles with no significant loss of catalytic activity.

Multifunctional Fe3O4@nSiO2@mSiO2/Pr-Imi-NH2·Ag core–shell microspheres as highly efficient catalysts in the aqueous reduction of nitroarenes: improved catalytic activity and facile catalyst recovery

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41871-41877 ◽  
Author(s):  
Mina Jafari Nasab ◽  
Ali Reza Kiasat
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Mesoporous Silica ◽  
Superparamagnetic Iron Oxide ◽  
Silica Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Functionalized Mesoporous Silica ◽  
Iron Oxide Core ◽  
Core Shell Nanoparticles

Core@shell nanoparticles with a superparamagnetic iron oxide core, a middle nonporous silica shell, and an outer organo functionalized mesoporous silica shell were synthesized and evaluated for immobilizing Ag nanoparticles.

Enantioselective 1,2-reductions of β-trifluoromethylated-α,β-unsaturated ketones to chiral allylic alcohols over organoruthenium-functionalized mesoporous silica nanospheres

2015 ◽  
Vol 5 (3) ◽  
pp. 1750-1757 ◽  
Author(s):  
Meng Wu ◽  
Lingyu Kong ◽  
Kaiwen Wang ◽  
Ronghua Jin ◽  
Tanyu Cheng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Allylic Alcohols ◽  
Functionalized Silica ◽  
Silica Nanospheres ◽  
Unsaturated Ketones ◽  
Functionalized Mesoporous Silica ◽  
Mesoporous Silica Nanospheres

Organoruthenium-functionalized silica nanospheres display excellent catalytic activity and high enantioselectivity in the enantioselective 1,2-reductions of β-trifluoromethylated-α,β-unsaturated ketones.

Gold Nanoparticle Functionalized Mesoporous Silica-Chitosan as Efficient and Recyclable Catalyst for the Green One-Pot Synthesis of 4H-pyran Derivatives in Aqueous Medium

2020 ◽  
Vol 17 (4) ◽  
pp. 268-280
Author(s):  
Razieh Azimi ◽  
Zahra Lasemi ◽  
Ayemeh Bagheri Hashkavayi
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Gold Nanoparticle ◽  
Significant Loss ◽  
One Pot ◽  
Dicarbonyl Compounds ◽  
Au Nps ◽  
Functionalized Mesoporous Silica ◽  
Three Component Reaction ◽  
Active Methylene

Gold nanoparticle functionalized mesoporous silica-chitosan (Au NPs/silica-chitosan) as an environmentally benign and heterogeneous nanocatalyst was prepared and its properties were characterized using field emission scanning electron microscopy (FE-SEM) and fourier transform infrared (FT-IR). The catalytic activity of Au NPs/silica-chitosan was studied in the synthesis of biologically important 4H-pyran derivatives. In these reactions, efficient and green syntheses of 4H-pyrans were carried out using isatins or aldehydes, active methylene compounds, and 1,3-dicarbonyl compounds in the presence of a catalytic amount of Au NPs/silica-chitosan in water in excellent yields. Au NPs/silica-chitosan can be recovered easily and reused without any significant loss of the catalytic activity. 4H-pyran derivatives were synthesized using Au NPs/silica-chitosan as catalyst in three component reaction of isatins/aldehydes, active methylene, and 1,3-dicarbonyl compounds in water. Au NPs/Silica-Chitosan was prepared by reaction of aqueous solution of HAuCl4 (1 wt.%) and solution chitosan in deionized water and acetic acid with tetraethyl ortho silicate (TEOS) at 100ºC for 24 h. Gold nanoparticle functionalized mesoporous silica-chitosan was prepared and its catalytic activity was investigated for forming 4H-pyran derivatives. In this study, active methylene and 1,3-dicarbonyl compounds reacted with various isatins and aldehydes which afforded the corresponding spirooxindoles with 88-98% yields. This method includes the environmentally friendly reaction conditions, short reaction time, simple work-up, excellent yield, broad scope of usable substrates, recovery and reusability of heterogeneous catalyst.

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