Stability of cobalt-based Fischer–Tropsch catalyst supported on oxidized carbon nanotubes

2020 ◽  
Vol 13 (04) ◽  
pp. 2050021 ◽  
Author(s):  
Sergei Chernyak ◽  
Alexander Burtsev ◽  
Alexander Egorov ◽  
Konstantin Maslakov ◽  
Serguei Savilov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Nitrogen Adsorption ◽  
Structural Transformations ◽  
Fischer Tropsch ◽  
Cobalt Particle ◽  
Adsorption Data ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes ◽  
The Stability ◽  
Nitrogen Adsorption Data

The stability of 20[Formula: see text]wt.% Co/CNT catalyst was tested in the Fischer–Tropsch synthesis and the structural transformations both in the catalyst and support were analyzed. The catalyst showed high conversion and stable selectivity during three weeks of the test, which was attributed to the optimal and stable cobalt particle size of [Formula: see text]13–14[Formula: see text]nm promoted by the support pre-oxidation. XPS, Raman, and nitrogen adsorption data revealed that the carefully chosen catalyst annealing and reduction conditions ensured the preservation of the support structure.

Dehydrogenation of Bicyclohexyl on a Pt-Catalyst on the Basis of Oxidized Carbon Nanotubes

2018 ◽  
Vol 482 (1) ◽  
pp. 52-55
Author(s):  
A. Kalenchuk ◽  
◽  
S. Chernyak ◽  
V. Bogdan ◽  
V. Lunin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Pt Catalyst ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes

scholarly journals New approach in the application of lignin for the synthesis of hybrid materials

2017 ◽  
Vol 89 (1) ◽  
pp. 161-171 ◽  
Author(s):  
Beata Podkościelna ◽  
Marta Goliszek ◽  
Olena Sevastyanova
Keyword(s):  
Suspension Polymerization ◽  
Nitrogen Adsorption ◽  
Experimental Protocol ◽  
New Approach ◽  
Surface Areas ◽  
Adsorption Data ◽  
Novel Method ◽  
Derivatives Of ◽  
Polymerization Method ◽  
Nitrogen Adsorption Data

AbstractIn this study, a novel method for the synthesis of hybrid, porous microspheres, including divinylbenzene (DVB), triethoxyvinylsilane (TEVS) and methacrylated lignin (L-Met), is presented. The methacrylic derivatives of kraft lignin were obtained by reaction with methacryloyl chloride according to a new experimental protocol. The course of the modification of lignin was confirmed by attenuated total reflectance (ATR-FTIR) and nuclear magnetic resonance (NMR) spectroscopy. The emulsion-suspension polymerization method was employed to obtain copolymers of DVD, TEVS and L-Met in spherical forms. The porous structures and morphologies of the obtained lignin-containing functionalized microspheres were investigated by low-temperature nitrogen adsorption data and scanning electron microscopy (SEM). The microspheres are demonstrated to be mesoporous materials with specific surface areas in the range of 430–520 m2/g. The effects of the lignin component on the porous structure, shape, swelling and thermal properties of the microspheres were evaluated.

Interaction of aqueous suspensions of single-walled oxidized carbon nanotubes with inorganic and organic electrolytes

2021 ◽  
pp. 117948
Author(s):  
Anna N. Laguta ◽  
Nikolay O. Mchedlov-Petrossyan ◽  
Sergey I. Bogatyrenko ◽  
Sergiy M. Kovalenko ◽  
Natalya D. Bunyatyan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Organic Electrolytes ◽  
Aqueous Suspensions ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes ◽  
Inorganic And Organic

scholarly journals Effect of Cobalt Catalyst Confinement in Carbon Nanotubes Support on Fischer-Tropsch Synthesis Performance

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 572 ◽  
Author(s):  
Omid Akbarzadeh ◽  
Noor Mohd Zabidi ◽  
Yasmin Abdul Wahab ◽  
Nor Hamizi ◽  
Zaira Chowdhury ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fixed Bed ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Cobalt Oxide Nanoparticles ◽  
Co Conversion ◽  
Multi Walled Carbon Nanotubes ◽  
Pre Treatment ◽  
The Stability

Pre-treating the multi-walled carbon nanotubes (CNTs) support by refluxing in 35 vol% nitric acid followed by heating at the temperature of 600 to 900 °C resulted in the formation of defects on the CNTs. Increasing the temperature of the pre-treatment of the CNTs from 600 °C to 900 °C, enhanced the fraction of cobalt-oxide nanoparticles encapsulated in the channels of CNTs from 31% to 70%. The performance of Co/CNTs in Fischer-Tropsch synthesis (FTS) was evaluated in a fixed-bed micro-reactor at a temperature of 240 °C and a pressure of 2.0 MPa. The highest CO conversion obtained over Co/CNTs.A.900 was 59% and it dropped by ~3% after 130 h of time-on-stream. However, maximum CO conversion using Co/CNTs.A.600 catalysts was 28% and it decreased rapidly by about 54% after 130 h of time-on-stream. These findings show that the combined acid and thermal pre-treatment of CNTs support at 900 °C has improved the stability and activity of the Co/CNTs catalyst in FTS.

scholarly journals Kinetics of scandium ion sorption onto oxidized carbon nanotubes

2019 ◽  
Vol 150 (9) ◽  
pp. 1569-1572 ◽  
Author(s):  
Mateusz Pęgier ◽  
Krzysztof Kilian ◽  
Krystyna Pyrzynska
Keyword(s):  
Carbon Nanotubes ◽  
Ion Sorption ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes ◽  
Kinetics Of
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