FORMIC-ACID DECOMPOSITION ON THE (110)-MICROFACETED SURFACE OF TIO2(100) - INSIGHTS DERIVED FROM 180-LABELING STUDIES

被引:45
作者
HENDERSON, MA
机构
[1] Materials and Interfaces Group, Environmental Molecular Sciences Laboratory, Pacific Northwest Laboratory, Richland, WA 99352
关键词
D O I
10.1021/j100041a048
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
The decomposition of formic acid was examined on the (110)-microfaceted surface of TiO2(100) with temperature-programmed desorption(TPD), static secondary ion mass spectrometry (SSIMS), low-energy electron diffraction (LEED), and work function measurements. No ordered structures of formic acid, or of its main decomposition product formate, were observed. Formic acid decomposed on TiO2(100) to formate and a surface proton at temperatures below 250 K. The main TPD products were water, which desorbed below 450 K, and CO, which desorbed at 555 K. Formaldehyde was also observed as a TPD product at 540 K. CO and formaldehyde resulted from formate decomposition. TPD experiments performed on the O-18-enriched surface show that extensive isotopic oxygen incorporation occurred for the CO, water, and formaldehyde TPD products. The incorporation of lattice O-18 into the water product indicates that the acid proton, deposited during formic acid decomposition, was able to abstract oxygen from the surface. SSIMS measurements indicate that incorporation of lattice O-18 into the formate species did not occur until the onset of formate decomposition, implying that lattice oxygen atoms were involved in the formate decomposition process. Studies with coadsorbed (H2O)-O-18 indicate that water was a mild site blocker of formic acid adsorption and/or decomposition sites and that little or no isotopic oxygen exchange took place between the two adsorbed molecules.
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页码:15253 / 15261
页数:9
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共 30 条
  • [1] INFLUENCE OF LIGHT-INTENSITY AND MEMBRANE-PROPERTIES ON THE PHOTOCATALYTIC DEGRADATION OF FORMIC-ACID OVER TIO2 CERAMIC MEMBRANES
    AGUADO, MA
    ANDERSON, MA
    HILL, CG
    [J]. JOURNAL OF MOLECULAR CATALYSIS, 1994, 89 (1-2): : 165 - 178
  • [2] A KINETIC APPROACH OF COMPETITIVE PHOTOELECTROOXIDATION OF HCOOH AND H2O ON TIO2 ANATASE THIN-LAYERS VIA ONLINE MASS DETECTION
    BOGDANOFF, P
    ALONSOVANTE, N
    [J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1994, 379 (1-2): : 415 - 421
  • [3] A JACKETED ANNULAR MEMBRANE PHOTOCATALYTIC REACTOR FOR WASTE-WATER TREATMENT - DEGRADATION OF FORMIC-ACID AND ATRAZINE
    CHESTER, G
    ANDERSON, M
    READ, H
    ESPLUGAS, S
    [J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1993, 71 (03) : 291 - 297
  • [4] LOW-ENERGY ELECTRON-DIFFRACTION AND ELECTRON-SPECTROSCOPY STUDIES OF CLEAN (110) AND (100) TITANIUM-DIOXIDE (RUTILE) CRYSTAL-SURFACES
    CHUNG, YW
    LO, WJ
    SOMORJAI, GA
    [J]. SURFACE SCIENCE, 1977, 64 (02) : 588 - 602
  • [5] TPD AND HREELS INVESTIGATION OF THE REACTION OF FORMIC-ACID ON ZRO2(100)
    DILARA, PA
    VOHS, JM
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (49) : 12919 - 12923
  • [6] INFRARED-VISIBLE SUM FREQUENCY GENERATION STUDY OF HCOOH ON A MGO(001) SURFACE
    DOMEN, K
    AKAMATSU, N
    YAMAMOTO, H
    WADA, A
    HIROSE, C
    [J]. SURFACE SCIENCE, 1993, 283 (1-3) : 468 - 472
  • [7] FORMIC-ACID DECOMPOSITION ON SNO2(110)
    GERCHER, VA
    COX, DF
    [J]. SURFACE SCIENCE, 1994, 312 (1-2) : 106 - 114
  • [8] OXYGEN-VACANCY SITES ON TIO2(100)1X3 USING SURFACE CORE-LEVEL-SHIFT PHOTOELECTRON DIFFRACTION
    HARDMAN, PJ
    PRAKASH, NS
    MURYN, CA
    RAIKAR, GN
    THOMAS, AG
    PRIME, AF
    THORNTON, G
    BLAKE, RJ
    [J]. PHYSICAL REVIEW B, 1993, 47 (23): : 16056 - 16059
  • [9] THE INFLUENCE OF OXIDE SURFACE-STRUCTURE ON ADSORBATE CHEMISTRY - DESORPTION OF WATER FROM THE SMOOTH, THE MICROFACETED AND THE ION SPUTTERED SURFACES OF TIO2(100)
    HENDERSON, MA
    [J]. SURFACE SCIENCE, 1994, 319 (03) : 315 - 328
  • [10] THE INTERACTION OF H2O WITH A TIO2(110) SURFACE
    HUGENSCHMIDT, MB
    GAMBLE, L
    CAMPBELL, CT
    [J]. SURFACE SCIENCE, 1994, 302 (03) : 329 - 340