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Received June 7, 2006
Accepted July 31, 2006
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Reduction potentials of heteropolyacid catalysts probed by scanning tunneling microscopy and UV-visible spectroscopy
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea 1Department of Chemical Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark, DE 19716, USA
inksong@snu.ac.kr
Korean Journal of Chemical Engineering, January 2007, 24(1), 51-54(4), 10.1007/s11814-007-5008-1
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Abstract
Reduction potentials of heteropolyacid (HPA) catalysts were probed by scanning tunneling microscopy (STM) and UV-visible spectroscopy. Correlations between reduction potentials and NDR (negative differential resistance) peak voltages, and between reduction potentials and absorption edge energies of HPA catalysts were established. The reduction potentials of HPA catalysts have been shown to follow similar trends to the NDR peak voltages of selfassembled HPA monolayers and the absorption edge energies of bulk HPAs. In the UV-visible spectra of HPA catalysts, lower absorption edge energies corresponded to higher reduction potentials of the HPAs.
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References
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Hill CL, Prosser-McCartha CM, Coord. Chem. Rev., 143, 407 (1995)
Kaba MS, Song IK, Barteau MA, J. Phys. Chem., 100(50), 19577 (1996)
Kozhevnikov IV, Catal. Rev.-Sci. Eng., 37(2), 311 (1995)
Kubelka P, Munk F, Z. Tech. Phys., 12, 593 (1931)
Lee WY, Song IK, Lee JK, Park GI, Lim SS, Korean J. Chem. Eng., 14(6), 432 (1997)
Okuhara T, Mizuno N, Misono M, Adv. Catal., 41, 113 (1996)
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SONG IK, MOON SH, LEE WY, Korean J. Chem. Eng., 8(1), 33 (1991)
Song IK, Barteau MA, J. Mol. Catal. A-Chem., 182, 185 (2002)
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Song IK, Barteau MA, J. Mol. Catal. A-Chem., 212, 229 (2004)
Song IK, Barteau MA, Langmuir, 20(5), 1850 (2004)
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Youn MH, Kim H, Jung JC, Song IK, Barteau KP, Barteau MA, J. Mol. Catal. A-Chem., 241, 227 (2005)
Youn MH, Kim H, Song IK, Barteau KP, Barteau MA, React. Kinet. Catal. Lett., 87, 85 (2006)
