New CoO-SiO2-Sol pillared clays as catalysts for NOx conversion

Jin Ho Choy, Hyun Jung, Yang Su Han, Joo Byoung Yoon, Yong-Gun Shul, Hyun Jong Kim

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

New CoO-SiO2-sol pillared montmorillonite (Co-SiM) is synthesized by interlamellar hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in the presence of Co2+ ion via an alkylammonium intercalated montmorillonite. The silicate layers of Na+-montmorillonite are expanded in advance with hexadecyltrimethylammonium cation up to ∼22 Å, followed by reaction with a mixed sol solution of TEOS and COCl2·6H2O in the presence of n-dodecylamine as a cotemplate. A microporous Co-SiM is obtained after removing the organic templates at 550°C. The nitrogen adsorption-desorption isotherm for the pillared sample reveals that a large number of micropores are created between the silicate layers, giving rise to a high BET specific surface area (SBET = ∼570 m2/g) and a pore volume (V = ∼0.65 mL/g). According to the x-ray photoelectron and x-ray absorption spectroscopy, the incorporated cobalt species is found to be CoO, which is homogeneously dispersed on the surface of the SiO2 pillars. The Co-SiM exhibits an excellent NO conversion rate of ca. 50% at 200°C, which continuously increases up to 80% at 500°C.

Original languageEnglish
Pages (from-to)3823-3828
Number of pages6
JournalChemistry of Materials
Volume14
Issue number9
DOIs
Publication statusPublished - 2002 Sep 1

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Bentonite
Polymethyl Methacrylate
Sols
Clay minerals
Clay
Catalysts
Silicates
X rays
Photoelectrons
Cobalt
Absorption spectroscopy
Specific surface area
Isotherms
Cations
Condensation
Hydrolysis
Desorption
Nitrogen
Positive ions
clay

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Choy, J. H., Jung, H., Han, Y. S., Yoon, J. B., Shul, Y-G., & Kim, H. J. (2002). New CoO-SiO2-Sol pillared clays as catalysts for NOx conversion. Chemistry of Materials, 14(9), 3823-3828. https://doi.org/10.1021/cm020201x
Choy, Jin Ho ; Jung, Hyun ; Han, Yang Su ; Yoon, Joo Byoung ; Shul, Yong-Gun ; Kim, Hyun Jong. / New CoO-SiO2-Sol pillared clays as catalysts for NOx conversion. In: Chemistry of Materials. 2002 ; Vol. 14, No. 9. pp. 3823-3828.
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abstract = "New CoO-SiO2-sol pillared montmorillonite (Co-SiM) is synthesized by interlamellar hydrolysis and condensation of tetraethyl orthosilicate (TEOS) in the presence of Co2+ ion via an alkylammonium intercalated montmorillonite. The silicate layers of Na+-montmorillonite are expanded in advance with hexadecyltrimethylammonium cation up to ∼22 {\AA}, followed by reaction with a mixed sol solution of TEOS and COCl2·6H2O in the presence of n-dodecylamine as a cotemplate. A microporous Co-SiM is obtained after removing the organic templates at 550°C. The nitrogen adsorption-desorption isotherm for the pillared sample reveals that a large number of micropores are created between the silicate layers, giving rise to a high BET specific surface area (SBET = ∼570 m2/g) and a pore volume (V = ∼0.65 mL/g). According to the x-ray photoelectron and x-ray absorption spectroscopy, the incorporated cobalt species is found to be CoO, which is homogeneously dispersed on the surface of the SiO2 pillars. The Co-SiM exhibits an excellent NO conversion rate of ca. 50{\%} at 200°C, which continuously increases up to 80{\%} at 500°C.",
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Choy, JH, Jung, H, Han, YS, Yoon, JB, Shul, Y-G & Kim, HJ 2002, 'New CoO-SiO2-Sol pillared clays as catalysts for NOx conversion', Chemistry of Materials, vol. 14, no. 9, pp. 3823-3828. https://doi.org/10.1021/cm020201x

New CoO-SiO2-Sol pillared clays as catalysts for NOx conversion. / Choy, Jin Ho; Jung, Hyun; Han, Yang Su; Yoon, Joo Byoung; Shul, Yong-Gun; Kim, Hyun Jong.

In: Chemistry of Materials, Vol. 14, No. 9, 01.09.2002, p. 3823-3828.

Research output: Contribution to journalArticle

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T1 - New CoO-SiO2-Sol pillared clays as catalysts for NOx conversion

AU - Choy, Jin Ho

AU - Jung, Hyun

AU - Han, Yang Su

AU - Yoon, Joo Byoung

AU - Shul, Yong-Gun

AU - Kim, Hyun Jong

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