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
收藏
页码：826 / 832
页数：7
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