Scanning Tunneling Microscopy Study of H6+x P2Mo18-x V x O62 (x=0-3) Wells-Dawson Heteropolyacid Catalysts: Correlation of NDR Peak Voltage with Reduction Potential and Oxidation Catalysis

被引：6

作者：

Choi, Jung Ho ^{[1
]}

Park, Dong Ryul ^{[1
]}

Park, Sunyoung ^{[1
]}

Song, In Kyu ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Chem & Biol Engn, Inst Chem Proc, Seoul 151744, South Korea

来源：

CATALYSIS LETTERS | 2011年 / 141卷 / 06期

关键词：

Heteropolyacid; Vanadium; Scanning tunneling microscopy; Negative differential resistance; Redox property; NEGATIVE DIFFERENTIAL RESISTANCE; SELF-ASSEMBLED MONOLAYERS; ACID CATALYSIS; KEGGIN; STM; DEHYDROGENATION; ARRAYS; SPECTROSCOPY; MOLECULES; SURFACE;

D O I：

10.1007/s10562-011-0596-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Scanning tunneling microscopy (STM) and tunneling spectroscopy studies were carried out to examine the redox properties of vanadium-containing H6+x P2Mo18-x V (x) O-62 (x = 0, 1, 2, 3) Wells-Dawson heteropolyacid (HPA) catalysts. The HPAs formed two-dimensional well-ordered monolayer arrays on a graphite surface and exhibited a distinctive current-voltage behavior called negative differential resistance (NDR). The NDR peak voltages of H6+x P2Mo18-x V (x) O-62 HPAs were correlated with reduction potentials determined by temperature-programmed reduction and with catalytic activity for oxidative dehydrogenation of isobutyraldehyde to methacrolein. The NDR peak voltage of H6+x P2Mo18-x V (x) O-62 appeared at less negative voltage with increasing reduction potential and oxidation catalysis.

引用

页码：826 / 832

页数：7

共 37 条

[1] Keggin-type polyoxotungstate as a catalyst in oxidative dehydrogenation of propane [J].

Al-Zahrani, SM ;

Jibril, BY ;

Abasaeed, AE .

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2001, 175 (1-2) :259-265

[2] Heteropolyacid-based catalysis. Dawson acid for MTBE synthesis in gas phase [J].

Baronetti, G ;

Briand, L ;

Sedran, U ;

Thomas, H .

APPLIED CATALYSIS A-GENERAL, 1998, 172 (02) :265-272

[3] The state of the art on Wells-Dawson heteropoly-compounds - A review of their properties and applications [J].

Briand, LE ;

Baronetti, GT ;

Thomas, HJ .

APPLIED CATALYSIS A-GENERAL, 2003, 256 (1-2) :37-50

[4]

CAPASSO F, 1990, PHYS QUANTUM ELECT D

[5] THE STRUCTURE OF THE 9(18)-HETEROPOLY ANION IN POTASSIUM 9(18)-TUNGSTOPHOSPHATE, K6(P2W18O62).14H2O [J].

DAWSON, B .

ACTA CRYSTALLOGRAPHICA, 1953, 6 (02) :113-126

[6] POSITIONING SINGLE ATOMS WITH A SCANNING TUNNELING MICROSCOPE [J].

EIGLER, DM ;

SCHWEIZER, EK .

NATURE, 1990, 344 (6266) :524-526

[7] Self-assembled mixed monolayer containing ferrocenylthiol molecules: STM observations and electrochemical investigations [J].

Fujii, Shosuke ;

Kurokawa, Shu ;

Murase, Kuniaki ;

Lee, Kyung-Hwang ;

Sakai, Akira ;

Sugimura, Hiroyuki .

ELECTROCHIMICA ACTA, 2007, 52 (13) :4436-4442

[8] Tuning negative differential resistance in a molecular film [J].

Grobis, M ;

Wachowiak, A ;

Yamachika, R ;

Crommie, MF .

APPLIED PHYSICS LETTERS, 2005, 86 (20) :1-3

[9] STUDY OF HETEROPOLY COMPOUNDS WITH THE KEGGIN STRUCTURE BY TEMPERATURE-PROGRAMMED REDUCTION AND H-D EXCHANGE [J].

HODNETT, BK ;

MOFFAT, JB .

JOURNAL OF CATALYSIS, 1985, 91 (01) :93-103

[10] Studies of low coverage adsorption of Li on Si(001): Observation of negative differential resistance and electron trapping [J].

Johansson, MKJ ;

Gray, SM ;

Johansson, LSO .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 1996, 14 (02) :1015-1018

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