scholarly journals Investigation of spherical alumina supported catalyst for carbon nanotubes production from waste polyethylene

2021 ◽  
Vol 146 ◽  
pp. 201-207 ◽  
Author(s):  
Xiaotong Liu ◽  
Su He ◽  
Zhenan Han ◽  
Chunfei Wu
Keyword(s):  
Carbon Nanotubes ◽  
Supported Catalyst ◽  
Waste Polyethylene ◽  
Spherical Alumina

scholarly journals Non-purified commercial multiwalled carbon nanotubes supported on electrospun polyacrylonitrile@polypyrrole nanofibers as photocatalysts for water decontamination

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 9911-9920
Author(s):  
Gabriele Capilli ◽  
Damian Rodríguez Sartori ◽  
Monica C. Gonzalez ◽  
Enzo Laurenti ◽  
Claudio Minero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Advanced Oxidation Processes ◽  
Supported Catalyst ◽  
Advanced Oxidation ◽  
Multiwalled Carbon ◽  
Water Decontamination ◽  
Oxidation Processes ◽  
Commercial Carbon ◽  
Metallic Impurities

Under UV-Vis irradiation, the metallic impurities embedded in non-purified commercial carbon nanotubes generate radicals suitable for advanced oxidation processes. Semiconducting PPY membranes enhance the photo activity of a supported catalyst.

Catalytic Properties of Ni/CNTs and Ca-Promoted Ni/CNTs for Methanation Reaction of Carbon Dioxide

2014 ◽  
Vol 924 ◽  
pp. 217-226 ◽  
Author(s):  
Xiang Feng Hu ◽  
Wen Yang ◽  
Ning Wang ◽  
Shi Zhong Luo ◽  
Wei Chu
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Catalytic Properties ◽  
Supported Catalyst ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Methanation Reaction ◽  
Ni Species ◽  
Nickel Species

Nickel/carbon nanotubes (Ni/CNTs), Nickel/alumina (Ni/Al2O3), calcium-promoted Ni/CNTs and calcium-promoted Ni/Al2O3 were synthesized by impregnation method. Methanation of carbon dioxide was used as a probe to evaluate their catalytic performance. The features of these Ni-based catalysts were investigated via XRD, H2-TPR, H2-TPD and the N2 adsorptiondesorption isotherms. H2-TPR showed that nickel species on Ni/CNTs was reduced more easily with respect to that on Ni/Al2O3, and addition of Ca can increase the content of easily reducible Ni species for Ni/CNTs. XRD and H2-TPD indicated that addition of Ca promoted dispersion for CNTs-supported catalyst. These finding ultimately enhanced catalytic activity and stability for Ni/CNTs catalyst modified with Ca.

Narrow (n,m)-Distribution of Single-Walled Carbon Nanotubes Grown Using a Solid Supported Catalyst

2003 ◽  
Vol 125 (37) ◽  
pp. 11186-11187 ◽  
Author(s):  
Sergei M. Bachilo ◽  
Leandro Balzano ◽  
Jose E. Herrera ◽  
Francisco Pompeo ◽  
Daniel E. Resasco ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Supported Catalyst ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Synthesis of Propylene Carbonate from Epoxide and CO2 Catalyzed by Carbon Nanotubes Supported Fe1.5PMo12O40

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Tahani Al-Garni ◽  
Nada Al-Jallal ◽  
Ahmed Aouissi
Keyword(s):  
Carbon Nanotubes ◽  
Propylene Carbonate ◽  
Inductively Coupled Plasma ◽  
Supported Catalyst ◽  
Catalyst Loading ◽  
X Ray Diffraction ◽  
Plasma Spectrometry ◽  
Inductively Coupled ◽  
Transmission Electron

Carbon nanotubes (CNTs) were functionalized and were then used as supports of Fe1.5PMo12O40 (FePMo) Keggin heteropolyanions catalysts. The characterization of the resulting catalysts was investigated by inductively coupled plasma spectrometry (ICP), Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) light spectroscopy, and transmission electron microscopy (TEM). FTIR and XRD results confirmed that FePMo was bounded on CNTs successfully and the Keggin structure was preserved. Characterization by TEM showed that solids with high FePMo content exhibited aggregation of FePMo in large particles. The as-prepared catalysts were tested in the synthesis of propylene carbonate (PC) from CO2 and propylene oxide (PO) in a solvent-free reaction and under mild conditions. Effects of various parameters, such as reaction temperature, reaction time, FePMo content on the support, and catalyst loading on the reaction, were investigated. It has been found that CNTs supported FePMo achieved 57.7% PO conversion and 99.0% PC selectivity, whereas unsupported FePMo led only to 8.5% conversion and 48.6% selectivity. The remarkable enhancement of the catalytic activity over the supported catalyst can be attributed mainly to the better dispersion and reactivity of the FePMo catalyst in the supported material.

Growth of carbon nanotubes in six orthogonal directions on spherical alumina microparticles

Carbon ◽  
2011 ◽  
Vol 49 (7) ◽  
pp. 2273-2286 ◽  
Author(s):  
Delong He ◽  
Hao Li ◽  
Weilong Li ◽  
Paul Haghi-Ashtiani ◽  
Pascal Lejay ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Spherical Alumina

A high stability AuPd-ZrO 2 -multiwall carbon nanotubes supported-catalyst in a formic acid electro-oxidation reaction

2018 ◽  
Vol 451 ◽  
pp. 289-297 ◽  
Author(s):  
B. Lesiak ◽  
A. Malolepszy ◽  
M. Mazurkiewicz-Pawlicka ◽  
L. Stobinski ◽  
L. Kövér ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Formic Acid ◽  
Oxidation Reaction ◽  
High Stability ◽  
Supported Catalyst ◽  
Multiwall Carbon Nanotubes ◽  
Electro Oxidation ◽  
Multiwall Carbon

Catalytic synthesis of carbon nanotubes and carbon spheres using Kaolin supported catalyst

2005 ◽  
Vol 123 (2) ◽  
pp. 102-106 ◽  
Author(s):  
Zong-Xiang Xu ◽  
Jing-Dong Lin ◽  
V.A.L. Roy ◽  
Yan Ou ◽  
Dai-Wei Liao
Keyword(s):  
Carbon Nanotubes ◽  
Supported Catalyst ◽  
Catalytic Synthesis ◽  
Carbon Spheres ◽  
Synthesis Of Carbon Nanotubes

scholarly journals Fine-tuning the catalytic activity by applying nitrogen-doped carbon nanotubes as catalyst supports for the hydrogenation of olefins

2019 ◽  
Vol 129 (1) ◽  
pp. 95-106 ◽  
Author(s):  
Emőke Sikora ◽  
Adrienn Kiss ◽  
Zsuzsa H. Göndör ◽  
Péter Pekker ◽  
Ferenc Kristály ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Metal Binding ◽  
Catalyst Support ◽  
Supported Catalyst ◽  
Hydrogenation Reaction ◽  
Fine Tuning ◽  
Multi Wall Carbon Nanotubes ◽  
Support Materials ◽  
Liquid Phase Hydrogenation

AbstractNitrogen-free multi-wall carbon nanotubes (MWCNTs) and N-doped bamboo-like carbon nanotubes (BCNTs) were synthesized by using catalytic vapor deposition (CVD) and used as catalyst support materials. Pd, Rh, Ru, and Ir have been deposited onto the nanotubes to achieve metal/nanotube catalysts. The catalytic activity of the samples was fine-tuned by changing the type of support. BCNT supported Pd and Rh (Pd/BCNT, Rh/MWCNT) catalysts were found to be the most active for liquid phase hydrogenation of octadecene amongst these samples. The initial olefin hydrogenation rate of the Pd/BCNT sample was slightly higher than the corresponding MWCNT-supported catalyst. Based on the hydrogenation reaction, the performance of these catalyst had been ranked as follows: Pd/BCNT ≈ Rh/MWCNT > Pd/MWCNT > Rh/BCNT >  > Ir/MWCNT > Ru/BCNT > Ir/BCNT > Ru/MWCNT. The structural properties of chemisorbed Pd on MWCNT and N- BCNT were also characterized by means of computational chemical methods in order to shed some light on the nature of metal binding properties of N-doped and undoped surfaces. The calculations shown preference towards the edges of the surfaces which is in good agreement with the experimental findings.

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