scholarly journals Combinatorial Optimization of Heterogeneous Catalysts Used in the Growth of Carbon Nanotubes

Langmuir ◽  
2001 ◽  
Vol 17 (2) ◽  
pp. 260-264 ◽  
Author(s):  
Alan M. Cassell ◽  
Sunita Verma ◽  
Lance Delzeit ◽  
M. Meyyappan ◽  
Jie Han
Keyword(s):  
Carbon Nanotubes ◽  
Combinatorial Optimization ◽  
Heterogeneous Catalysts

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 Pyrolyzing Renewable Sugar and Taurine on the Surface of Multi-Walled Carbon Nanotubes as Heterogeneous Catalysts for Hydroxymethylfurfural Production

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 517 ◽  
Author(s):  
Huiping Ji ◽  
Jie Fu ◽  
Tianfu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Metal Salt ◽  
Textural Properties ◽  
Solvent System ◽  
Hydrothermal Stability ◽  
Transportation Fuels ◽  
Water Solvent ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Conversion of biorenewable feedstocks into transportation fuels or chemicals likely necessitates the development of novel heterogeneous catalysts with good hydrothermal stability, due to the nature of highly oxygenated biomass compounds and the prevalence of water as a processing solvent. The use of carbon-based materials, derived from sugars as catalyst precursors, can achieve hydrothermal stability while simultaneously realizing the goal of sustainability. In this work, the simultaneous pyrolysis of glucose and taurine in the presence of multi-walled carbon nanotubes (MWCNTs), to obtain versatile solid acids, has been demonstrated. Structural and textural properties of the catalysts have been characterized by TEM, TGA, and XPS. Additionally, solid state nuclear magnetic resonance (ssNMR) spectroscopy has been exploited to elucidate the chemical nature of carbon species deposited on the surface of MWCNTs. Al(OTf)3, a model Lewis acidic metal salt, has been successfully supported on sulfonic groups tethered to MWCNTs. This catalyst has been tested for C6 sugar dehydration for the production of HMF in a tetrahydrofuran (THF)/water solvent system with good recyclability.

Preparation of wrapped carbon nanotubes poly(4-vinylpyridine)/MTO based heterogeneous catalysts for the oxidative desulfurization (ODS) of model and synthetic diesel fuel

2017 ◽  
Vol 200 ◽  
pp. 392-401 ◽  
Author(s):  
Davide Piccinino ◽  
Issam Abdalghani ◽  
Giorgia Botta ◽  
Marcello Crucianelli ◽  
Maurizio Passacantando ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Diesel Fuel ◽  
Heterogeneous Catalysts ◽  
Oxidative Desulfurization ◽  
Synthetic Diesel

scholarly journals Heterogeneous Organo- and Metal Catalysis Using Phosphine Oxide Derivatives Anchored on Multiwalled Carbon Nanotubes

2020 ◽  
Vol 6 (3) ◽  
pp. 57
Author(s):  
Maria Cristina Ligi ◽  
Anna Flis ◽  
Giacomo Biagiotti ◽  
Giulia Serrano ◽  
K. Michał Pietrusiewicz ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Pd Nanoparticles ◽  
Phosphine Oxides ◽  
Heck Reactions ◽  
Multiwalled Carbon ◽  
Metal Catalysis ◽  
Mitsunobu Reactions ◽  
Oxidized Multiwalled Carbon Nanotubes

Oxidized multiwalled carbon nanotubes were modified anchoring phosphine oxides and used as heterogeneous catalysts. A proper substitution of the phosphine oxides allowed the use of the Tour reaction and the nitrene cycloaddition to obtain functionalized carbon nanotubes (CNT) with a loading up to 0.73 mmol/g of material. The catalysts proved efficient in Wittig reactions, Mitsunobu reactions, and Staudinger ligations. Furthermore, the phosphorus decorated CNT were used to produce nanocomposite with Pd nanoparticles able to catalyze Heck reactions.

scholarly journals Effect of Different Catalyst Supports on the Quality, Yield and Morphology of Carbon Nanotubes Produced from Waste Polypropylene Plastics

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 692
Author(s):  
Helen Uchenna Modekwe ◽  
Messai Adenew Mamo ◽  
Kapil Moothi ◽  
Michael Olawale Daramola
Keyword(s):  
Carbon Nanotubes ◽  
Heterogeneous Catalysts ◽  
Sol Gel ◽  
Oxide Supports ◽  
Nanoparticle Agglomeration ◽  
Yield And Quality ◽  
Nimo Catalysts ◽  
Waste Polypropylene

The role of the effect of the support on the reactivity of heterogeneous catalysts cannot be over-emphasized. Therefore, the study documented in this article investigated the effect of different metal oxide supports (MgO, CaO and TiO2) and mixed oxide supports (CaTiO3) on the performance of a bimetallic NiMo catalyst prepared via the sol–gel method during the catalytic growth of carbon nanotubes (CNTs) from waste polypropylene (PP). Waste PP was pyrolyzed at 700 °C in a single-stage chemical vapor deposition reactor and off-gas was utilized in-situ as a cheap carbon feedstock for the growth of CNTs under similar conditions for all the prepared NiMo catalysts (supported and unsupported). The structures of the prepared catalysts and deposited carbon were extensively characterized using X-ray diffraction (XRD), temperature-programmed reduction (TPR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), etc. The catalytic performance of NiMo supported and unsupported catalysts was evaluated in terms of the yield, purity, and morphology of synthesized CNTs. The results revealed that the stabilizing role of supports is fundamental in preventing nanoparticle agglomeration and aggregation, thereby resulting in improved yield and quality of CNTs. Supported NiMo catalysts produced better aligned graphitic and high-quality CNTs. The NiMo/CaTiO3 catalyst produced the highest carbon of 40.0%, while unsupported NiMo produced low-quality CNTs with the lowest carbon yield of 18.4%. Therefore, the type of catalyst support and overall stability of catalytic materials play significant roles in the yield and quality of CNTs produced from waste PP.

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