On the Reduction Potential of Cation-exchanged Heteropolyacids (HPAs)

In Kyu Song; Han Soo Kim; Myung-Suk Chun

Korean Journal of Chemical Engineering, Vol.20, No.5, 844-849, September, 2003

DOI10.1007/BF02697286 Export Citation

On the Reduction Potential of Cation-exchanged Heteropolyacids (HPAs)

In Kyu Song^†, Han Soo Kim , and Myung-Suk Chun¹

Department of Environmental & Applied Chemical Engineering, Kangnung National University, Kangwondo 210-702, Korea
¹Complex Fluids Research Team, Korea Institute of Science and Technology, Seoul 130-650, Korea

E-mail:

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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[Referenced By]

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[1] Ai M, Appl. Catal., 4, 245 (1982)

[2] Alimarin IP, Dorokhova EN, Kazanskii LP, Prokhorova GV, Zh. Anal. Khim., 35, 2000 (1980)

[3] Altenau JJ, Pope MT, Prados RA, So H, Inorg. Chem., 14, 417 (1975)

[4] Barteau MA, Lyons JE, Song IK, J. Catal., 216, 236 (2003)

[5] Brown GM, Noe-Spirlet MR, Busing WR, Levy HA, Acta Crystallogr. Sect. B-Struct. Sci., 33, 1038 (1977)

[6] Choi JS, Song IK, Lee WY, Korean J. Chem. Eng., 17(3), 280 (2000)

[7] Eguchi K, Seiyama T, Yamazoe N, Katsuki S, Taketa H, J. Catal., 111, 336 (1988)

[8] Hill CL, Prosser-McCartha CM, Coord. Chem. Rev., 143, 407 (1995)

[9] Kaba MS, Song IK, Barteau MA, J. Vac. Sci. Technol. A, 15(3), 1299 (1997)

[10] Kaba MS, Song IK, Barteau MA, J. Phys. Chem., 100(50), 19577 (1996)

[11] Keggin JF, Nature, 131, 908 (1933)

[12] Keita B, Nadjo L, Mater. Chem. Phys., 22, 77 (1989)

[13] Kim HC, Moon SH, Lee WY, Chem. Lett., 447 (1991)

[14] Kinne M, Barteau MA, Surf. Sci., 447, 105 (2000)

[15] Kozhevnikov IV, Catal. Rev.-Sci. Eng., 37(2), 311 (1995)

[16] Lee WY, Song IK, HWAHAK KONGHAK, 38(3), 317 (2000)

[17] Lee WY, Song IK, Lee JK, Park GI, Lim SS, Korean J. Chem. Eng., 14(6), 432 (1997)

[18] Melsheimer J, Mahmoud SS, Mestl G, Schlogl R, Catal. Lett., 60(3), 103 (1999)

[19] Misono M, Catal. Rev.-Sci. Eng., 29, 269 (1987)

[20] Mizuno N, Iwamoto M, Tateishi M, Appl. Catal. A: Gen., 128, 1165 (1995)

[21] Mizuno N, Suh DJ, Han W, Kudo T, J. Mol. Catal. A-Chem., 128, 309 (1995)

[22] Mizuno N, Tateishi M, Iwamoto M, J. Chem. Soc.-Chem. Commun., 1411 (1994)

[23] Okuhara T, Mizuno N, Misono M, Adv. Catal., 41, 113 (1996)

[24] Park GI, Lee WY, Song IK, HWAHAK KONGHAK, 38(2), 155 (2000)

[25] Pope MT, Muller A, "Polyoxometalates: From Platonic Solids to Anti-retroviral Activity," Kluwer Academic Publishers, Dordrecht, The Netherlands (1994)

[26] Pope MT, Varga GM, Inorg. Chem., 5, 1249 (1966)

[27] Song IK, Kaba MS, Barteau MA, Lee WY, Catal. Today, 44(1-4), 285 (1998)

[28] Song IK, Kaba MS, Barteau MA, Lee WY, HWAHAK KONGHAK, 35(3), 407 (1997)

[29] Song IK, Barteau MA, Korean J. Chem. Eng., 19(4), 567 (2002)

[30] Song IK, Lyons JE, Barteau MA, Catal. Today, in press (2003)

[31] Song IK, Moon SH, Lee WY, Korean J. Chem. Eng., 8(1), 33 (1991)

[32] Song IK, Shnitser RB, Cowan JJ, Hill CL, Barteau MA, Inorg. Chem., 41(5), 1292 (2002)

[33] Stobbe-Kreemers AW, "The Development of Heterogeneous Wacker Oxidation Catalysis: The Role of the Support and the Redox Component," Ph.D. Thesis, Delft Univ. (1993)

[34] Strandberg R, Acta Chem. Scand. A, 29, 359 (1975)

[35] Tanaka K, Ozami A, J. Catal., 8, 1 (1967)

[36] Weber RS, J. Phys. Chem., 98(11), 2999 (1994)