Heterolytic alkene oxidation with H2O2 catalyzed by Nb-substituted Lindqvist tungstates immobilized on carbon nanotubes

2021 ◽  
Author(s):  
Vasiliy Yu. Evtushok ◽  
Irina D. Ivanchikova ◽  
Vladimir A. Lopatkin ◽  
Nataliya V. Maksimchuk ◽  
Olga Yu. Podyacheva ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Monomeric Form ◽  
Alkene Oxidation ◽  
Recyclable Catalysts ◽  
P Immobilization

Immobilization of Nb-substituted Lindqvist tungstates on carbon nanotubes stabilizes a monomeric form, Nb(OH)W5, and leads to efficient and recyclable catalysts for heterolytic alkene oxidation with H2O2.

Nitrogen-Doped Carbon Nanotubes as an Effective Support of Heterogeneous Catalysts for Selective Alkene Oxidation

2021 ◽  
Vol 62 (2) ◽  
pp. 288-298
Author(s):  
A. N. Suboch ◽  
V. Yu. Evtushok ◽  
L. S. Kibis ◽  
O. A. Kholdeeva ◽  
O. Yu. Podyacheva
Keyword(s):  
Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Alkene Oxidation ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

scholarly journals Synthesis of Fe3O4/Pt Nanoparticles Decorated Carbon Nanotubes and Their Use as Magnetically Recyclable Catalysts

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Hongkun He ◽  
Chao Gao
Keyword(s):  
Carbon Nanotubes ◽  
Pt Nanoparticles ◽  
Reduction Reaction ◽  
Raw Material ◽  
Synthesis Process ◽  
High Catalytic Activity ◽  
Hydrolysis Method ◽  
Recyclable Catalysts ◽  
Temperature Solution ◽  
Average Size

We report a facile approach to prepare Fe3O4/Pt nanoparticles decorated carbon nanotubes (CNTs). The superparamagnetic Fe3O4nanoparticles with average size of4∼5 nm were loaded on the surfaces of carboxyl groups functionalized CNTs via a high-temperature solution-phase hydrolysis method from the raw material of FeCl3. The synthesis process of magnetic CNTs is green and readily scalable. The loading amounts of Fe3O4nanopartilces and the magnetizations of the resulting magnetic CNTs show good tunability. The Pt nanopaticles with average size of 2.5 nm were deposited on the magnetic CNTs through a solution-based method. It is demonstrated that the Fe3O4/Pt nanoparticles decorated CNTs have high catalytic activity in the reduction reaction of 4-nitrophenol and can be readily recycled by a magnet and reused in the next reactions with high efficiencies for at least fifteen successive cycles. The novel CNTs-supported magnetically recyclable catalysts are promising in heterogeneous catalysis applications.

Metal-functionalized carbon nanotubes for biomass conversion: base-free highly efficient and recyclable catalysts for aerobic oxidation of 5-hydroxymethylfurfural

2019 ◽  
Vol 43 (26) ◽  
pp. 10601-10609 ◽  
Author(s):  
Poonam Sharma ◽  
Mohit Solanki ◽  
Rakesh K. Sharma
Keyword(s):  
Carbon Nanotubes ◽  
Selective Oxidation ◽  
Noble Metal ◽  
Catalytic System ◽  
Biomass Conversion ◽  
Aerobic Oxidation ◽  
Functionalized Carbon Nanotubes ◽  
Highly Efficient ◽  
Recyclable Catalysts ◽  
Furandicarboxylic Acid

A noble and non-noble metal-confined CNT-based catalytic system was developed for the base-free selective oxidation of 5-hydroxymethylfurfural to produce 2,5-furandicarboxylic acid and 2,5-diformylfurane.

Oxygen sensitive 1-amino-2-naphthol immobilized functionalized-carbon nanotube electrode

2020 ◽  
Vol 44 (21) ◽  
pp. 8849-8858
Author(s):  
Vanshika Jain ◽  
Tamilselvi Gurusamy ◽  
Prakasam Gayathri ◽  
Kothandaraman Ramanujam
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Oxygen Sensing ◽  
Surface Oxygen ◽  
Multiwalled Carbon ◽  
Mwcnt Surface ◽  
Oxygen Sensitive ◽  
P Immobilization ◽  
Functionalized Carbon Nanotube

Immobilization of 1-amino-2napthol (AN) is enhanced complexing with Cu2+ on multiwalled carbon nanotubes (f-MWCNT) surface. Oxygen is reduced at the ligand (AN) site into water, therefore AN–Cu2+ immobilized on MWCNT exhibits oxygen sensing.

Green synthesis of 1,4-dihydropyridines using cobalt carbon nanotubes as recyclable catalysts

2021 ◽  
Author(s):  
Kaier Wu ◽  
Yuye Bai ◽  
Dewei Chen ◽  
Lu Chen ◽  
Yubing Huang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Green Synthesis ◽  
Recyclable Catalysts

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

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