Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit

Morinobu Endo, Kenji Takeuchi, Takeyuki Tajiri, Ki Chul Park, Feng Wang, Yoong Ahm Kim, Takuya Hayashi, Mauricio Terrones Maldonado, Mildred S. Dresselhaus

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A sodium chloride (NaCl) catalyst (0.1 w/w %) lowers the oxidation temperature of graphitized multiwalled carbon nanotubes: MWCNT-20 (diameter: 20-70 nm) and MWCNT-80 (diameter: 80-150 nm). The analysis of the reaction kinetics indicates that the oxidation of MWCNT-20 and MWCNT-80 mixed with no NaCl exhibits single reaction processes with activation energies of E a= 159 and 152 kJ mol-1, respectively. The oxidation reaction in the presence of NaCl is shown to consist of two different reaction processes, that is, a first reaction and a second reaction process. The first reaction process is dominant at a low temperature of around 600°C, while the second reaction process becomes more dominant than the first one in a higher temperature region. The activation energies of the first reaction processes (MWCNT-20: Ea1 = 35.7 kJ mol-1; MWCNT-80: Ea1 = 43.5 kJ mol-1) are much smaller than those of the second reaction processes (MWCNT-20: Ea2 = 170 kJ mol-1; MWCNT-80: E a2 = 171 kJ mol-1). The comparison of the kinetic parameters and the results of the spectroscopic and microscopic analyses imply that the lowering of the oxidation temperature in the presence of NaCl results from the introduction of disorder into the graphitized MWCNTs (during the first reaction process), thus increasing the facility of the oxidation reaction of the disorder-induced nanotubes (in the second reaction process). It is found that the larger nanopits and cracks on the outer graphitic layers are caused by the catalytic effect of NaCl. Therefore, the NaCl-mixed samples showed more rapid and stronger oxidation compared with that of the nonmixed samples at the same residual quantity.

Original languageEnglish (US)
Pages (from-to)12017-12021
Number of pages5
JournalJournal of Physical Chemistry B
Volume110
Issue number24
DOIs
StatePublished - Jun 22 2006

Fingerprint

Multiwalled carbon nanotubes (MWCN)
sodium chlorides
Sodium chloride
Sodium Chloride
carbon nanotubes
Oxidation
oxidation
Activation energy
Temperature
Kinetic parameters
Reaction kinetics
Nanotubes
disorders
activation energy
Cracks
Catalysts
nanotubes
reaction kinetics
cracks

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Endo, M., Takeuchi, K., Tajiri, T., Park, K. C., Wang, F., Kim, Y. A., ... Dresselhaus, M. S. (2006). Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit. Journal of Physical Chemistry B, 110(24), 12017-12021. https://doi.org/10.1021/jp061058o
Endo, Morinobu ; Takeuchi, Kenji ; Tajiri, Takeyuki ; Park, Ki Chul ; Wang, Feng ; Kim, Yoong Ahm ; Hayashi, Takuya ; Terrones Maldonado, Mauricio ; Dresselhaus, Mildred S. / Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit. In: Journal of Physical Chemistry B. 2006 ; Vol. 110, No. 24. pp. 12017-12021.
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abstract = "A sodium chloride (NaCl) catalyst (0.1 w/w {\%}) lowers the oxidation temperature of graphitized multiwalled carbon nanotubes: MWCNT-20 (diameter: 20-70 nm) and MWCNT-80 (diameter: 80-150 nm). The analysis of the reaction kinetics indicates that the oxidation of MWCNT-20 and MWCNT-80 mixed with no NaCl exhibits single reaction processes with activation energies of E a= 159 and 152 kJ mol-1, respectively. The oxidation reaction in the presence of NaCl is shown to consist of two different reaction processes, that is, a first reaction and a second reaction process. The first reaction process is dominant at a low temperature of around 600°C, while the second reaction process becomes more dominant than the first one in a higher temperature region. The activation energies of the first reaction processes (MWCNT-20: Ea1 = 35.7 kJ mol-1; MWCNT-80: Ea1 = 43.5 kJ mol-1) are much smaller than those of the second reaction processes (MWCNT-20: Ea2 = 170 kJ mol-1; MWCNT-80: E a2 = 171 kJ mol-1). The comparison of the kinetic parameters and the results of the spectroscopic and microscopic analyses imply that the lowering of the oxidation temperature in the presence of NaCl results from the introduction of disorder into the graphitized MWCNTs (during the first reaction process), thus increasing the facility of the oxidation reaction of the disorder-induced nanotubes (in the second reaction process). It is found that the larger nanopits and cracks on the outer graphitic layers are caused by the catalytic effect of NaCl. Therefore, the NaCl-mixed samples showed more rapid and stronger oxidation compared with that of the nonmixed samples at the same residual quantity.",
author = "Morinobu Endo and Kenji Takeuchi and Takeyuki Tajiri and Park, {Ki Chul} and Feng Wang and Kim, {Yoong Ahm} and Takuya Hayashi and {Terrones Maldonado}, Mauricio and Dresselhaus, {Mildred S.}",
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Endo, M, Takeuchi, K, Tajiri, T, Park, KC, Wang, F, Kim, YA, Hayashi, T, Terrones Maldonado, M & Dresselhaus, MS 2006, 'Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit', Journal of Physical Chemistry B, vol. 110, no. 24, pp. 12017-12021. https://doi.org/10.1021/jp061058o

Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit. / Endo, Morinobu; Takeuchi, Kenji; Tajiri, Takeyuki; Park, Ki Chul; Wang, Feng; Kim, Yoong Ahm; Hayashi, Takuya; Terrones Maldonado, Mauricio; Dresselhaus, Mildred S.

In: Journal of Physical Chemistry B, Vol. 110, No. 24, 22.06.2006, p. 12017-12021.

Research output: Contribution to journalArticle

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T1 - Sodium chloride-catalyzed oxidation of multiwalled carbon nanotubes for environmental benefit

AU - Endo, Morinobu

AU - Takeuchi, Kenji

AU - Tajiri, Takeyuki

AU - Park, Ki Chul

AU - Wang, Feng

AU - Kim, Yoong Ahm

AU - Hayashi, Takuya

AU - Terrones Maldonado, Mauricio

AU - Dresselhaus, Mildred S.

PY - 2006/6/22

Y1 - 2006/6/22

N2 - A sodium chloride (NaCl) catalyst (0.1 w/w %) lowers the oxidation temperature of graphitized multiwalled carbon nanotubes: MWCNT-20 (diameter: 20-70 nm) and MWCNT-80 (diameter: 80-150 nm). The analysis of the reaction kinetics indicates that the oxidation of MWCNT-20 and MWCNT-80 mixed with no NaCl exhibits single reaction processes with activation energies of E a= 159 and 152 kJ mol-1, respectively. The oxidation reaction in the presence of NaCl is shown to consist of two different reaction processes, that is, a first reaction and a second reaction process. The first reaction process is dominant at a low temperature of around 600°C, while the second reaction process becomes more dominant than the first one in a higher temperature region. The activation energies of the first reaction processes (MWCNT-20: Ea1 = 35.7 kJ mol-1; MWCNT-80: Ea1 = 43.5 kJ mol-1) are much smaller than those of the second reaction processes (MWCNT-20: Ea2 = 170 kJ mol-1; MWCNT-80: E a2 = 171 kJ mol-1). The comparison of the kinetic parameters and the results of the spectroscopic and microscopic analyses imply that the lowering of the oxidation temperature in the presence of NaCl results from the introduction of disorder into the graphitized MWCNTs (during the first reaction process), thus increasing the facility of the oxidation reaction of the disorder-induced nanotubes (in the second reaction process). It is found that the larger nanopits and cracks on the outer graphitic layers are caused by the catalytic effect of NaCl. Therefore, the NaCl-mixed samples showed more rapid and stronger oxidation compared with that of the nonmixed samples at the same residual quantity.

AB - A sodium chloride (NaCl) catalyst (0.1 w/w %) lowers the oxidation temperature of graphitized multiwalled carbon nanotubes: MWCNT-20 (diameter: 20-70 nm) and MWCNT-80 (diameter: 80-150 nm). The analysis of the reaction kinetics indicates that the oxidation of MWCNT-20 and MWCNT-80 mixed with no NaCl exhibits single reaction processes with activation energies of E a= 159 and 152 kJ mol-1, respectively. The oxidation reaction in the presence of NaCl is shown to consist of two different reaction processes, that is, a first reaction and a second reaction process. The first reaction process is dominant at a low temperature of around 600°C, while the second reaction process becomes more dominant than the first one in a higher temperature region. The activation energies of the first reaction processes (MWCNT-20: Ea1 = 35.7 kJ mol-1; MWCNT-80: Ea1 = 43.5 kJ mol-1) are much smaller than those of the second reaction processes (MWCNT-20: Ea2 = 170 kJ mol-1; MWCNT-80: E a2 = 171 kJ mol-1). The comparison of the kinetic parameters and the results of the spectroscopic and microscopic analyses imply that the lowering of the oxidation temperature in the presence of NaCl results from the introduction of disorder into the graphitized MWCNTs (during the first reaction process), thus increasing the facility of the oxidation reaction of the disorder-induced nanotubes (in the second reaction process). It is found that the larger nanopits and cracks on the outer graphitic layers are caused by the catalytic effect of NaCl. Therefore, the NaCl-mixed samples showed more rapid and stronger oxidation compared with that of the nonmixed samples at the same residual quantity.

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