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Issue
Korean Journal of Chemical Engineering,
Vol.20, No.5, 844-849, 2003
On the Reduction Potential of Cation-exchanged Heteropolyacids (HPAs)
Song IK, Kim HS, Chun MS
UV-Visible spectroscopy and scanning tunneling microscopy (STM) studies were performed to explore reduction potentials of cation-exchanged Keggin-type heteropolyacid (HPA) catalysts. Absorption band edge and negative differential resistance (NDR) peak voltage of cation-exchanged HPA samples determined by UV-Visible spectroscopy and STM, respectively, were colsely related to their reduction potentials. It was observed that HPAs with higher reduction potentials showed absorption band edges at longer wave lengths and exhibited NDR peak voltages at less negative applied values. The reduction potentials of cation-exchanged HPA catalysts could also be correlated with the electronegativities of counter-cations. Substitution of more electronegative counter-cations increased reduction potentials of the HPAs. The NDR peak voltage and the absorption band edge of HPAs could be utilized as a correlating parameter for their reduction potentials.
Keywords: Heteropolyacid (HPA); Reduction Potential; NDR; Absorption Edge
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[Cited By]
  1. Youn MH, Park DR, Jung JC, Kim H, Barteau MA, Song IK, Korean Journal of Chemical Engineering, 24(1), 51, 2007
  2. Kim H, Jung JC, Park DR, Lee J, Cho KM, Park S, Lee SH, Song IK, Korean Journal of Chemical Engineering, 25(2), 231, 2008
  3. Guo X, Huang C, Chen B, Korean Journal of Chemical Engineering, 25(4), 675, 2008
  4. Guo X, Huang C, Yingxia Li Y, Korean Journal of Chemical Engineering, 25(4), 697, 2008
  5. La KW, Kim H, Jung JC, Lee J, Park DR, Lee SH, Song IK, Korean Journal of Chemical Engineering, 25(4), 710, 2008
  6. Lee SH, Park DR, Kim H, Lee J, Jung JC, Woo SY, Song WS, Kwon MS, Song IK, Korean Journal of Chemical Engineering, 25(5), 1018, 2008
  7. Song SH, Lee SH, Park DR, Kim HS, Woo SY, Song WS, Kwon MS, Song IK, Korean Journal of Chemical Engineering, 26(2), 382, 2009
  8. Kim HS, Park DR, Park SY, Jung JC, Lee SB, Song IK, Korean Journal of Chemical Engineering, 26(3), 660, 2009
  9. Park DR, Kim H, Jung JC, Shin MS, Han SJ, Song IK, Korean Journal of Chemical Engineering, 26(4), 990, 2009
  10. Song SH, Lee SH, Park DR, Kim H, Woo SY, Song WS, Kwon MS, Song IK, Korean Journal of Chemical Engineering, 26(6), 1539, 2009
  11. Park DR, Hong UG, Song SH, Seo JG, Baeck SH, Chung JS, Song IK, Korean Journal of Chemical Engineering, 27(2), 465, 2010
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