Plasma-catalytic decomposition of nitrous oxide over Γ-alumina-supported metal oxides

Jin Oh Jo, Quang Hung Trinh, Seong H. Kim, Young Sun Mok

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This work investigated the decomposition of dilute N2O from gas streams with various oxygen contents by using a plasma-catalytic process over metal oxide catalysts supported on γ-Al2O3. Among the metals explored (Ru, Co, Cu, V, etc.), Ru was found to be the best catalyst for the decomposition of N2O in a plasma-catalytic reactor, and most of the experiments were conducted with alumina-supported Ru. The effects of applied voltage, reaction temperature, O2 content, gas flow rate and initial N2O content on the decomposition efficiency and byproducts formation were examined. Compared to the catalyst-alone case, the presence of plasma enhanced the decomposition efficiency by 30-50%, depending on the operating condition. The increase in the oxygen content from 0 to 20% largely decreased the catalytic decomposition efficiency, whereas in the presence of plasma N2O could be successfully decomposed even at 20% O2 content. The decomposition efficiency was not a strong function of the initial N2O concentration in the range of 225-1800 ppm, exhibiting pseudo first-order reaction kinetics. Without O2, there were negligible byproducts, but in the presence of O2, NO and NO2 were formed mainly due to the plasma-induced reactions between background molecules such as N2 and O2. The results obtained in this work showed the feasibility of plasma-catalytic process for the abatement of N2O.

Original languageEnglish (US)
Pages (from-to)42-48
Number of pages7
JournalCatalysis Today
Volume310
DOIs
StatePublished - Jul 15 2018

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Aluminum Oxide
Nitrous Oxide
Oxides
Alumina
Metals
Decomposition
Plasmas
Byproducts
Oxygen
Catalysts
Catalyst supports
Reaction kinetics
Flow of gases
Gases
Flow rate
Molecules
Electric potential
Experiments

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Jo, Jin Oh ; Trinh, Quang Hung ; Kim, Seong H. ; Mok, Young Sun. / Plasma-catalytic decomposition of nitrous oxide over Γ-alumina-supported metal oxides. In: Catalysis Today. 2018 ; Vol. 310. pp. 42-48.
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abstract = "This work investigated the decomposition of dilute N2O from gas streams with various oxygen contents by using a plasma-catalytic process over metal oxide catalysts supported on γ-Al2O3. Among the metals explored (Ru, Co, Cu, V, etc.), Ru was found to be the best catalyst for the decomposition of N2O in a plasma-catalytic reactor, and most of the experiments were conducted with alumina-supported Ru. The effects of applied voltage, reaction temperature, O2 content, gas flow rate and initial N2O content on the decomposition efficiency and byproducts formation were examined. Compared to the catalyst-alone case, the presence of plasma enhanced the decomposition efficiency by 30-50{\%}, depending on the operating condition. The increase in the oxygen content from 0 to 20{\%} largely decreased the catalytic decomposition efficiency, whereas in the presence of plasma N2O could be successfully decomposed even at 20{\%} O2 content. The decomposition efficiency was not a strong function of the initial N2O concentration in the range of 225-1800 ppm, exhibiting pseudo first-order reaction kinetics. Without O2, there were negligible byproducts, but in the presence of O2, NO and NO2 were formed mainly due to the plasma-induced reactions between background molecules such as N2 and O2. The results obtained in this work showed the feasibility of plasma-catalytic process for the abatement of N2O.",
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Plasma-catalytic decomposition of nitrous oxide over Γ-alumina-supported metal oxides. / Jo, Jin Oh; Trinh, Quang Hung; Kim, Seong H.; Mok, Young Sun.

In: Catalysis Today, Vol. 310, 15.07.2018, p. 42-48.

Research output: Contribution to journalArticle

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AU - Trinh, Quang Hung

AU - Kim, Seong H.

AU - Mok, Young Sun

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AB - This work investigated the decomposition of dilute N2O from gas streams with various oxygen contents by using a plasma-catalytic process over metal oxide catalysts supported on γ-Al2O3. Among the metals explored (Ru, Co, Cu, V, etc.), Ru was found to be the best catalyst for the decomposition of N2O in a plasma-catalytic reactor, and most of the experiments were conducted with alumina-supported Ru. The effects of applied voltage, reaction temperature, O2 content, gas flow rate and initial N2O content on the decomposition efficiency and byproducts formation were examined. Compared to the catalyst-alone case, the presence of plasma enhanced the decomposition efficiency by 30-50%, depending on the operating condition. The increase in the oxygen content from 0 to 20% largely decreased the catalytic decomposition efficiency, whereas in the presence of plasma N2O could be successfully decomposed even at 20% O2 content. The decomposition efficiency was not a strong function of the initial N2O concentration in the range of 225-1800 ppm, exhibiting pseudo first-order reaction kinetics. Without O2, there were negligible byproducts, but in the presence of O2, NO and NO2 were formed mainly due to the plasma-induced reactions between background molecules such as N2 and O2. The results obtained in this work showed the feasibility of plasma-catalytic process for the abatement of N2O.

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