The Effects of Co-Mo/CaCO3 Catalyst's Calcination Temperature and Co/Mo Weight Ratio on Carbon Nanotube Production

Date

2015-01-01

Author

Hocaoglu, Caner
Sezgi, Naime Aslı

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

242
views

0
downloads

Carbon nanotubes (CNTs) were synthesized in the temperature range of 500-700 degrees C over cobalt (Co)- and molybdenum (Mo)impregnated CaCO3 catalysts using acetylene gas. The effects of Co-Mo/CaCO3 catalyst's calcination temperature and Co/Mo weight ratio on the carbon deposition rate were investigated. The synthesized CNTs were multiwalled nanotubes with variable outer diameters. They exhibited Type II isotherm, and their surface areas were in the range of 24.8-89.9m(2)/g. It was concluded that the Co/Mo ratio in the catalyst played an important role in the structure of carbon, Co was more active than Mo for the CNT growth, and the carbon deposition rate increased with an increase in the initial acetylene composition in argon, Co/Mo ratio, and the reaction and calcination temperatures. The highest carbon deposition rate was produced at a reaction temperature of 700 degrees C over the Co-Mo/CaCO3 catalyst synthesized at a Co/Mo ratio of 6 and a calcination temperature of 750 degrees C.

Subject Keywords

Acetylene, Calcium carbonate, Carbon nanotubes (CNTs), Chemical vapor deposition (CVD), Cobalt, Molybdenum

URI

https://hdl.handle.net/11511/48353

Journal

CHEMICAL ENGINEERING COMMUNICATIONS

DOI

https://doi.org/10.1080/00986445.2014.900051

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

The influence of polymerization temperature on structure and properties of polyaniline Yilmaz, Faris; Kucukyavuz, Zuhal (2009-01-31) The influence of polymerization temperature (from -25 to +25 degrees C) on molecular weight, crystallinity, electrical conductivity, thermal and morphological properties of polyaniline has been investigated. Aniline was oxidized in an aqueous medium with ammonium persulfate and 1.0 M hydrochloric acid. The reaction mixture freezes below -10 degrees C and hence lithium chloride was used in sufficient amount to prevent freezing. As the reaction temperature decreases, both the molecular weight of polyaniline a...
Kinetic investigation of chemical vapor deposition of B4C on tungsten substrate Karaman, Mustafa; Sezgi, Naime Aslı; Doğu, Timur; Ozbelge, H. Onder (2006-12-01) Production of beta-rhombohedral boron carbide (B4C) on a tungsten substrate by the chemical vapor deposition from a BCl3-H-2-CH4 gas mixture was achieved. An impinging-jet reactor was used to minimize the mass-transfer limitations on the reaction kinetics, which made a detailed kinetic investigation possible. Results of the XRD and XPS analyses showed that the solid product formed on the substrate is a rhombohedral B4C phase. Both dichloroborane and boron carbide formation rates were found to increase with ...
The biocatalytic effect of Halobacterium halobium on photoelectrochemical hydrogen production Sediroglu, V; Eroglu, I; Yucel, M; Turker, L; Gündüz, Ufuk (1999-04-30) Hydrogen gas can be produced electrochemically by leading a current through two electrodes immersed in a NaCl solution. Bacteriorhodopsin (BR) a protein found in the purple membrane of Halobacterium halobium, is known to pump protons across the membrane upon illumination. In this study, the effect of BR on photoelectrochemical hydrogen production was investigated. A batch type bio-photoelectrochemical reactor was designed and constructed. The photoelectrochemical hydrogen production experiments were perform...
Development of activated carbon/bimetallic transition metal phosphide composite materials for electrochemical capacitors and oxygen evolution reaction catalysis Köse, Kadir Özgün; Aydınol, Mehmet Kadri (2022-09-01) Pinecone-derived activated carbon (AC) and bimetallic transition metal phosphide (TMP) composites were produced and utilized as electrochemical capacitor (EC) electrodes and oxygen evolution reaction (OER) catalysts in this study. The base transition metal (TM) was Ni for all samples, and the secondary TM was one of Fe, Mn and Co. AC serves as a porous structure for double layer formation and active sites for OER catalysis. Bimetallic TMP is utilized due to redox reactions in EC and catalytic activity in OE...
Kinetic studies for boron carbide formation in a dual impinging-jet reactor Noyan-Dilek, S; Ozbelge, HO; Sezgi, Naime Aslı; Dogu, T (2001-02-07) The chemical vapor deposition (CVD) of boron carbide was investigated on a tungsten substrate from a gas mixture of BCl3, H-2, and CH4 in a dual impinging-jet reactor that was connected to an FT-IR spectrometer for on-line analysis of the reactor effluent stream. During CVD of boron carbide, the formation of BHCl2 was experimentally verified, and beta -rhombohedral B4C was formed. Conversion to boron carbide was found to increase with an increase in the BCl3/CH4 ratio. However, conversion to dichloroborane ...

Citation Formats

C. Hocaoglu and N. A. Sezgi, “The Effects of Co-Mo/CaCO3 Catalyst’s Calcination Temperature and Co/Mo Weight Ratio on Carbon Nanotube Production,” CHEMICAL ENGINEERING COMMUNICATIONS, pp. 1041–1050, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48353.