Catalyst-free carbon nanotubes from coal-based material
Abstract
DC-Arc Discharge technique has been used to synthesize carbon nanotubes from super clean coal samples instead of graphite electrodes filled with metal catalysts. The adverse effect of the mineral matter present in coal may be, thus, avoided. The cathode deposits showed the presence of single walled carbon nanotubes as well, which are generally known to be formed only in presence of transition metal catalysts and lanthanides. The process also avoids the tedious purification treatments of carbon nanotubes by strong acids to get rid of metal catalysts produced as impurities along with nanotubes. Thus, coal may be refined and demineralized by an organorefining technique to obtain super clean coal, an ultra low ash coal which may be used for the production of carbon nanotubes. The residual coal obtained after the organorefining may be used as an energy source for raising steam for power generation. Thus, coal may afford its use as an inexpensive feedstock for the production of carbon nanotubes besides its conventional role as a fuel for power generation.
- Authors:
- Indian Institute of Technology, New Delhi (India)
- Publication Date:
- OSTI Identifier:
- 20838224
- Resource Type:
- Journal Article
- Resource Relation:
- Journal Name: Energy Sources, Part A: Recovery, Utilization, and Environmental Effects; Journal Volume: 29; Journal Issue: 1
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 01 COAL, LIGNITE, AND PEAT; COAL; DEMINERALIZATION; ELECTRIC DISCHARGES; FULLERENES; NANOSTRUCTURES; ELECTRIC ARCS; CARBON; CATHODES
Citation Formats
Mathur, R.B., Lal, C., and Sharma, D.K. Catalyst-free carbon nanotubes from coal-based material. United States: N. p., 2007.
Web. doi:10.1080/009083190910334.
Mathur, R.B., Lal, C., & Sharma, D.K. Catalyst-free carbon nanotubes from coal-based material. United States. doi:10.1080/009083190910334.
Mathur, R.B., Lal, C., and Sharma, D.K. Mon .
"Catalyst-free carbon nanotubes from coal-based material". United States.
doi:10.1080/009083190910334.
@article{osti_20838224,
title = {Catalyst-free carbon nanotubes from coal-based material},
author = {Mathur, R.B. and Lal, C. and Sharma, D.K.},
abstractNote = {DC-Arc Discharge technique has been used to synthesize carbon nanotubes from super clean coal samples instead of graphite electrodes filled with metal catalysts. The adverse effect of the mineral matter present in coal may be, thus, avoided. The cathode deposits showed the presence of single walled carbon nanotubes as well, which are generally known to be formed only in presence of transition metal catalysts and lanthanides. The process also avoids the tedious purification treatments of carbon nanotubes by strong acids to get rid of metal catalysts produced as impurities along with nanotubes. Thus, coal may be refined and demineralized by an organorefining technique to obtain super clean coal, an ultra low ash coal which may be used for the production of carbon nanotubes. The residual coal obtained after the organorefining may be used as an energy source for raising steam for power generation. Thus, coal may afford its use as an inexpensive feedstock for the production of carbon nanotubes besides its conventional role as a fuel for power generation.},
doi = {10.1080/009083190910334},
journal = {Energy Sources, Part A: Recovery, Utilization, and Environmental Effects},
number = 1,
volume = 29,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
-
DC-Arc technique has been used to synthesize carbon nanotubes from super clean coal, chemically cleaned coal, original coal and waste plastics instead of using high purity graphite in the presence of metal catalysts. The results obtained are compared in terms of yield, purity and type of carbon nanotubes produced from different types of raw material used. In the present study different types of raw materials have been prepared i.e. chemically cleaned coal and super clean coal, and the carbon nanotubes have been synthesized by DC Arc discharge method. Taking in account the present need of utilizing coal as a cheapermore »
-
Single-walled carbon nanotubes based chemiresistive genosensor for label-free detection of human rheumatic heart disease
A specific and ultrasensitive, label free single-walled carbon nanotubes (SWNTs) based chemiresistive genosensor was fabricated for the early detection of Streptococcus pyogenes infection in human causing rheumatic heart disease. The mga gene of S. pyogenes specific 24 mer ssDNA probe was covalently immobilized on SWNT through a molecular bilinker, 1-pyrenemethylamine, using carbodiimide coupling reaction. The sensor was characterized by the current-voltage (I-V) characteristic curve and scanning electron microscopy. The sensing performance of the sensor was studied with respect to changes in conductance in SWNT channel based on hybridization of the target S. pyogenes single stranded genomic DNA (ssG-DNA) to itsmore » -
Surface-Initiated Titanium-Mediated Coordination Polymerization from Catalyst-Functionalized Single and Multiwalled Carbon Nanotubes
Single (SWNTs) and multiwalled (MWNTs) carbon nanotubes were functionalized with a titanium alkoxide catalyst through a Diels-Alder cycloaddition reaction. The catalyst-functionalized carbon nanotubes (CNTs) were used for the surface initiated titanium-mediated coordination polymerizations of L-lactide (L-LA), -caprolactone (-CL) and n-hexyl isocyanate (HIC) employing the grafting from technique. 1H NMR, IR and Raman spectra showed that the precursor catalyst was successfully synthesized and covalently attached on the CNTs surface. Thermogravimetric analysis (TGA) revealed that the grafted poly(L-lactide) (PLLA) content could be controlled with time. The final polymer-grafted CNTs were readily dissolved in organic solvents as compared to the insoluble pristine andmore » -
Production of carbon nanotubes: Chemical vapor deposition synthesis from liquefied petroleum gas over Fe-Co-Mo tri-metallic catalyst supported on MgO
Carbon nanotubes were produced by chemical vapor deposition method to meet the specifications for hydrogen storage. So far, the various catalyst had been studied outlining their activities, performances, and efficiencies. In this work, tri-metallic catalyst consist of Fe-Co-Mo supported on MgO was used. The catalyst was prepared by wet-impregnation method. Liquefied Petroleum Gas (LPG) was used as carbon source. The synthesis was conducted in atmospheric fixed bed reactor at reaction temperature range 750 – 850 °C for 30 minutes. The impregnation method applied in this study successfully deposed metal component on the MgO support surface. It found that the depositedmore »