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

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62 Citations (Scopus)


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
Issue number9
Publication statusPublished - 2002 Sep

All Science Journal Classification (ASJC) codes

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


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