Role of TEDA as an activated carbon impregnant for the removal of cyanogen chloride from air streams: Synergistic effect with Cu(ii)

John J. Mahle, Gregory W. Peterson, Bryan J. Schindler, Philip B. Smith, Joseph A. Rossin, George W. Wagner

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The hydrolysis and fate of cyanogen chloride (CK) in the presence of triethylenediamine (TEDA) - a widely used carbon impregnant - in aqueous and nonaqueous (acetonitrile) media has been determined. In the presence of water, anticipated TEDA substitution is not observed; rather, simple base-catalyzed (OH-) hydrolysis to cyanic acid (HOCN; unstable in water, decomposing to CO2 and NH3) is the major reaction, accompanied by a series of complex side reactions (not involving TEDA) to form several persistent compounds. Thus, the role of TEDA, in the presence of water, is primarily a source of OH-. CK substitution at TEDA is observed in acetonitrile, again forming several complex, but quite different, species. Studies examining the removal of CK from humidified air streams by carbon impregnated with TEDA and/or basic Cu2+ (another common carbon impregnant) are consistent with simple hydrolysis being the major CK-removal mechanism; no TEDA substitution is observed in the presence of humidity/water. Considering the reaction stoichiometry apparent at CK breakthrough for the impregnated carbons, the combination of TEDA and Cu2+ is much more effective than the individual impregnants themselves. This synergism is attributed to dissolution of basic Cu2+ by TEDA to form soluble complexes of the type [Cu(TEDA)2(OH)(H2O)]- in the carbon-adsorbed water layer, thus greatly increasing the dispersion and effectiveness of the basic Cu2+ impregnant.

Original languageEnglish (US)
Pages (from-to)20083-20090
Number of pages8
JournalJournal of Physical Chemistry C
Volume114
Issue number47
DOIs
StatePublished - Dec 2 2010

Fingerprint

cyanogen
activated carbon
Activated carbon
chlorides
Carbon
carbon
air
hydrolysis
Air
Hydrolysis
Substitution reactions
water
Water
substitutes
Acetonitrile
acetonitrile
Stoichiometry
humidity
stoichiometry
Atmospheric humidity

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Mahle, John J. ; Peterson, Gregory W. ; Schindler, Bryan J. ; Smith, Philip B. ; Rossin, Joseph A. ; Wagner, George W. / Role of TEDA as an activated carbon impregnant for the removal of cyanogen chloride from air streams : Synergistic effect with Cu(ii). In: Journal of Physical Chemistry C. 2010 ; Vol. 114, No. 47. pp. 20083-20090.
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abstract = "The hydrolysis and fate of cyanogen chloride (CK) in the presence of triethylenediamine (TEDA) - a widely used carbon impregnant - in aqueous and nonaqueous (acetonitrile) media has been determined. In the presence of water, anticipated TEDA substitution is not observed; rather, simple base-catalyzed (OH-) hydrolysis to cyanic acid (HOCN; unstable in water, decomposing to CO2 and NH3) is the major reaction, accompanied by a series of complex side reactions (not involving TEDA) to form several persistent compounds. Thus, the role of TEDA, in the presence of water, is primarily a source of OH-. CK substitution at TEDA is observed in acetonitrile, again forming several complex, but quite different, species. Studies examining the removal of CK from humidified air streams by carbon impregnated with TEDA and/or basic Cu2+ (another common carbon impregnant) are consistent with simple hydrolysis being the major CK-removal mechanism; no TEDA substitution is observed in the presence of humidity/water. Considering the reaction stoichiometry apparent at CK breakthrough for the impregnated carbons, the combination of TEDA and Cu2+ is much more effective than the individual impregnants themselves. This synergism is attributed to dissolution of basic Cu2+ by TEDA to form soluble complexes of the type [Cu(TEDA)2(OH)(H2O)]- in the carbon-adsorbed water layer, thus greatly increasing the dispersion and effectiveness of the basic Cu2+ impregnant.",
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Role of TEDA as an activated carbon impregnant for the removal of cyanogen chloride from air streams : Synergistic effect with Cu(ii). / Mahle, John J.; Peterson, Gregory W.; Schindler, Bryan J.; Smith, Philip B.; Rossin, Joseph A.; Wagner, George W.

In: Journal of Physical Chemistry C, Vol. 114, No. 47, 02.12.2010, p. 20083-20090.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Role of TEDA as an activated carbon impregnant for the removal of cyanogen chloride from air streams

T2 - Synergistic effect with Cu(ii)

AU - Mahle, John J.

AU - Peterson, Gregory W.

AU - Schindler, Bryan J.

AU - Smith, Philip B.

AU - Rossin, Joseph A.

AU - Wagner, George W.

PY - 2010/12/2

Y1 - 2010/12/2

N2 - The hydrolysis and fate of cyanogen chloride (CK) in the presence of triethylenediamine (TEDA) - a widely used carbon impregnant - in aqueous and nonaqueous (acetonitrile) media has been determined. In the presence of water, anticipated TEDA substitution is not observed; rather, simple base-catalyzed (OH-) hydrolysis to cyanic acid (HOCN; unstable in water, decomposing to CO2 and NH3) is the major reaction, accompanied by a series of complex side reactions (not involving TEDA) to form several persistent compounds. Thus, the role of TEDA, in the presence of water, is primarily a source of OH-. CK substitution at TEDA is observed in acetonitrile, again forming several complex, but quite different, species. Studies examining the removal of CK from humidified air streams by carbon impregnated with TEDA and/or basic Cu2+ (another common carbon impregnant) are consistent with simple hydrolysis being the major CK-removal mechanism; no TEDA substitution is observed in the presence of humidity/water. Considering the reaction stoichiometry apparent at CK breakthrough for the impregnated carbons, the combination of TEDA and Cu2+ is much more effective than the individual impregnants themselves. This synergism is attributed to dissolution of basic Cu2+ by TEDA to form soluble complexes of the type [Cu(TEDA)2(OH)(H2O)]- in the carbon-adsorbed water layer, thus greatly increasing the dispersion and effectiveness of the basic Cu2+ impregnant.

AB - The hydrolysis and fate of cyanogen chloride (CK) in the presence of triethylenediamine (TEDA) - a widely used carbon impregnant - in aqueous and nonaqueous (acetonitrile) media has been determined. In the presence of water, anticipated TEDA substitution is not observed; rather, simple base-catalyzed (OH-) hydrolysis to cyanic acid (HOCN; unstable in water, decomposing to CO2 and NH3) is the major reaction, accompanied by a series of complex side reactions (not involving TEDA) to form several persistent compounds. Thus, the role of TEDA, in the presence of water, is primarily a source of OH-. CK substitution at TEDA is observed in acetonitrile, again forming several complex, but quite different, species. Studies examining the removal of CK from humidified air streams by carbon impregnated with TEDA and/or basic Cu2+ (another common carbon impregnant) are consistent with simple hydrolysis being the major CK-removal mechanism; no TEDA substitution is observed in the presence of humidity/water. Considering the reaction stoichiometry apparent at CK breakthrough for the impregnated carbons, the combination of TEDA and Cu2+ is much more effective than the individual impregnants themselves. This synergism is attributed to dissolution of basic Cu2+ by TEDA to form soluble complexes of the type [Cu(TEDA)2(OH)(H2O)]- in the carbon-adsorbed water layer, thus greatly increasing the dispersion and effectiveness of the basic Cu2+ impregnant.

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