The dynamic behaviour of CH3OH and NO2 adsorbed on CeO2(111) studied by noncontact atomic force microscopy

被引:51
作者
Namai, Y [1 ]
Fukui, K [1 ]
Iwasawa, Y [1 ]
机构
[1] Univ Tokyo, Dept Chem, Grad Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan
关键词
D O I
10.1088/0957-4484/15/2/011
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The adsorption and reaction of methanol (CH3OH) and nitrogen dioxide (NO2) on CeO2 (111) surfaces in different oxidation states were studied by noncontact atomic force microscopy (NC-AFM). After CH3OH exposure, surface oxygen defects without reconstruction of the surrounding oxygen atoms were healed by methoxy species (CH3O). Under a CH3OH atmosphere, a heterogeneous feature in the reactivity of surface oxygen atoms to CH3OH was observed by successive NC-AFM observation: new line defects of oxygen were produced as a result of a chemical event. Successive NC-AFM measurements also revealed that oxygen vacancies on a slightly reduced CeO2 (111) surface were healed by exposure to NO2. The contrast of healed oxygen defects in NC-AFM images was similar to that of other surface oxygen atoms. This indicates that dissociative adsorption of NO2 occurred at the defects. Nitrogen trioxide (NO3) was also observed on a slightly reduced CeO2 (111) surface after NO2 exposure. On a CeO2 (111) surface without surface oxygen defects, neither adsorption of NO2 nor formation of NO3 was observed. The reaction mechanisms for the formation of line defects and NO3 are discussed briefly.
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收藏
页码:S49 / S54
页数:6
相关论文
共 30 条
[1]   COADSORPTION OF NITROGEN MONOXIDE AND NITROGEN-DIOXIDE IN ZEOLITIC DE-NOX CATALYSTS [J].
ADELMAN, BJ ;
LEI, GD ;
SACHTLER, WMH .
CATALYSIS LETTERS, 1994, 28 (2-4) :119-130
[2]   FREQUENCY-MODULATION DETECTION USING HIGH-Q CANTILEVERS FOR ENHANCED FORCE MICROSCOPE SENSITIVITY [J].
ALBRECHT, TR ;
GRUTTER, P ;
HORNE, D ;
RUGAR, D .
JOURNAL OF APPLIED PHYSICS, 1991, 69 (02) :668-673
[3]   Imaging the atomic arrangements on the high-temperature reconstructed α-Al2O3(0001) surface [J].
Barth, C ;
Reichling, M .
NATURE, 2001, 414 (6859) :54-57
[4]   Ultrathin ordered CeO2 overlayers on Pt(111):: interaction with NO2, NO, H2O and CO [J].
Berner, U ;
Schierbaum, K ;
Jones, G ;
Wincott, P ;
Haq, S ;
Thornton, G .
SURFACE SCIENCE, 2000, 467 (1-3) :201-213
[5]   Structure sensitivity of the reaction of methanol on ceria [J].
Ferrizz, RM ;
Wong, GS ;
Egami, T ;
Vohs, JM .
LANGMUIR, 2001, 17 (08) :2464-2470
[6]   Dynamic aspects and associated structures of TiO2(110) and CeO2(111) surfaces relevant to oxide catalyses [J].
Fukui, K ;
Takakusagi, S ;
Tero, R ;
Aizawa, M ;
Namai, Y ;
Iwasawa, Y .
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2003, 5 (24) :5349-5359
[7]   Imaging of surface oxygen atoms and their defect structures on CeO2(111) by noncontact atomic force microscopy [J].
Fukui, K ;
Namai, Y ;
Iwasawa, Y .
APPLIED SURFACE SCIENCE, 2002, 188 (3-4) :252-256
[8]   Atom-resolved image of the TiO2(110) surface by noncontact atomic force microscopy [J].
Fukui, K ;
Onishi, H ;
Iwasawa, Y .
PHYSICAL REVIEW LETTERS, 1997, 79 (21) :4202-4205
[9]   Redox properties of water on the oxidized and reduced surfaces of CeO2(111) [J].
Henderson, MA ;
Perkins, CL ;
Engelhard, MH ;
Thevuthasan, S ;
Peden, CHF .
SURFACE SCIENCE, 2003, 526 (1-2) :1-18
[10]   Atomic resolved imaging of cleaved NiO(100) surfaces by NC-AFM [J].
Hosoi, H ;
Sueoka, K ;
Hayakawa, K ;
Mukasa, K .
APPLIED SURFACE SCIENCE, 2000, 157 (04) :218-221