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Scanning tunneling microscopy and tunneling spectroscopy studies of niobium-containing H6+x P2W18−x Nb x O62 (x=0, 1, 2, 3)Wells-Dawson heteropolyacid catalysts to probe their redox property and oxidation catalysis

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Abstract

Niobium-containing H6+x P2W18−x Nb x O62 (x=0, 1, 2, 3) Wells-Dawson heteropolyacids (HPAs) were investigated by scanning tunneling microscopy (STM) and tunneling spectroscopy (TS) in order to elucidate their redox properties. The HPAs formed two-dimensional well-ordered monolayer arrays on graphite surface and exhibited a distinctive current-voltage behavior called negative differential resistance (NDR) in their tunneling spectra. NDR peak voltage measured on HPA molecule was correlated with reduction potential and absorption edge energy determined by electrochemical method and UV-visible spectroscopy, respectively. NDR peak voltage of H6+x P2W18−x Nb x O62 Wells-Dawson HPAs appeared at less negative voltage with increasing reduction potential and with decreasing absorption edge energy. Oxidative dehydrogenation of isobutyraldehyde was also carried out as a model reaction to probe oxidation catalysis of the HPAs. The trend of NDR peak voltage of H6+x P2W18−x Nb x O62 Wells-Dawson HPAs was well consistent with the trend of yield for methacrolein.

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Authors and Affiliations

  1. School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Gwanak-gu, Seoul, 151-744, Korea

    Jung Ho Choi, Dong Ryul Park, Sunyoung Park & In Kyu Song

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  1. Jung Ho Choi
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  2. Dong Ryul Park
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  3. Sunyoung Park
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  4. In Kyu Song
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Correspondence to In Kyu Song.

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Choi, J.H., Park, D.R., Park, S. et al. Scanning tunneling microscopy and tunneling spectroscopy studies of niobium-containing H6+x P2W18−x Nb x O62 (x=0, 1, 2, 3)Wells-Dawson heteropolyacid catalysts to probe their redox property and oxidation catalysis. Korean J. Chem. Eng. 28, 2137–2141 (2011). https://doi.org/10.1007/s11814-011-0119-0

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