scholarly journals Pd immobilized on magnetic chitosan as a heterogeneous catalyst for acetalization and hydrogenation reactions

2013 ◽  
Vol 279 ◽  
pp. 360-366 ◽  
Author(s):  
Jinghui Zhou ◽  
Zhengping Dong ◽  
Honglei Yang ◽  
Zhiqiang Shi ◽  
Xingchun Zhou ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Magnetic Chitosan ◽  
Hydrogenation Reactions

scholarly journals Immobilization of an Iridium(I)-NHC-Phosphine Catalyst for Hydrogenation Reactions under Batch and Flow Conditions

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 656
Author(s):  
Henrietta Kovács ◽  
Krisztina Orosz ◽  
Gábor Papp ◽  
Ferenc Joó ◽  
Henrietta Horváth
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Aqueous Phase ◽  
Levulinic Acid ◽  
Flow Reactor ◽  
High Catalytic Activity ◽  
Flow Conditions ◽  
Hydrogenation Reactions ◽  
Excellent Selectivity

Na2[Ir(cod)(emim)(mtppts)] (1) with high catalytic activity in various organic- and aqueous-phase hydrogenation reactions was immobilized on several types of commercially available ion-exchange supports. The resulting heterogeneous catalyst was investigated in batch reactions and in an H-Cube flow reactor in the hydrogenation of phenylacetylene, diphenylacetylene, 1-hexyne, and benzylideneacetone. Under proper conditions, the catalyst was highly selective in the hydrogenation of alkynes to alkenes, and demonstrated excellent selectivity in C=C over C=O hydrogenation; furthermore, it displayed remarkable stability. Activity of 1 in hydrogenation of levulinic acid to γ-valerolactone was also assessed.

Magnetic (chitosan/laponite)-immobilized copper(ii) ions: an efficient heterogeneous catalyst for azide–alkyne cycloaddition

2017 ◽  
Vol 41 (10) ◽  
pp. 3821-3828 ◽  
Author(s):  
Gholam Reza Mahdavinia ◽  
Moslem Soleymani ◽  
Mohammad Nikkhoo ◽  
Sayed Morteza F. Farnia ◽  
Mojtaba Amini
Keyword(s):  
Heterogeneous Catalyst ◽  
Catalytic System ◽  
Magnetic Chitosan ◽  
Green Protocol ◽  
Efficient Heterogeneous Catalyst

Under a green protocol and using Cu2+-loaded magnetic chitosan/laponite catalytic system, CuAAC reactions were successfully performed to obtain 1,4-disubstituted-1,2,3-triazoles in good to excellent yields.

Monodisperse Pd Nanotetrahedrons on Ultrathin MoO3–x Nanosheets as Excellent Heterogeneous Catalyst for Chemoselective Hydrogenation Reactions

2017 ◽  
Vol 121 (49) ◽  
pp. 27528-27534 ◽  
Author(s):  
Xiao Zhou ◽  
Hong-Yan Zhou ◽  
Tuck-Yun Cheang ◽  
Zhi-Wei Zhao ◽  
Cong-Cong Shen ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Chemoselective Hydrogenation ◽  
Hydrogenation Reactions

scholarly journals Magnetic Chitosan-Supported Silver Nanoparticles: A Heterogeneous Catalyst for the Reduction of 4-Nitrophenol

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 839 ◽  
Author(s):  
Hasan ◽  
Shehadi ◽  
Al-Bab ◽  
Elgamouz
Keyword(s):  
Silver Nanoparticles ◽  
Heterogeneous Catalyst ◽  
Active Catalyst ◽  
Low Cost ◽  
Catalytic Efficiency ◽  
Magnetic Chitosan ◽  
X Ray ◽  
Surface Modified ◽  
First Time ◽  
Magnetic Fe3o4

Developing heterogeneous catalyst using chitosan (CS) and magnetic Fe3O4 as support has been remarkably attractive due to their availability, low cost and non-toxicity. In this work, a heterogeneous catalyst (denoted as Fe3O4@CS@MS@Ag) was fabricated by the deposition of silver nanoparticles on magnetic chitosan via an easy and facile modification of its surface with methyl salicylate (MS). The catalyst was characterized using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). To the best of our knowledge, for the first time, CS decorated Fe3O4 (Fe3O4@CS) has shown the catalytic activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in presence of NaBH4. Surface modified magnetic chitosan (Fe3O4@CS@MS) also acts as active catalyst towards the reduction of 4-NP. However, catalytic efficiency has increased fourfold when silver-nanoparticles-deposited magnetic chitosan (Fe3O4@CS@MS@Ag) used as our target catalyst. The catalyst was separated with external magnet after each cycle of catalytic reaction and reused effectively five times with almost 90% efficiency.

Transfer hydrogenation of unsaturated bonds in the absence of base additives catalyzed by a cobalt-based heterogeneous catalyst

2015 ◽  
Vol 51 (12) ◽  
pp. 2331-2334 ◽  
Author(s):  
Jilan Long ◽  
Ying Zhou ◽  
Yingwei Li
Keyword(s):  
Heterogeneous Catalyst ◽  
Transfer Hydrogenation ◽  
Catalytic Transfer Hydrogenation ◽  
Highly Active ◽  
Hydrogenation Reactions ◽  
Catalytic Transfer

A novel non-noble Co@C–N system for catalytic transfer hydrogenation reactions is developed. The heterogeneous Co@C–N catalysts are highly active and selective in the hydrogenation of a variety of unsaturated bonds with isopropanol in the absence of base additives.

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