Photochemistry of methanol and methoxy groups adsorbed on powdered TiO2

被引：67

作者：

Chuang, CC ^{[1
]}

Chen, CC ^{[1
]}

Lin, JL ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Chem, Tainan 70101, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 13期

关键词：

D O I：

10.1021/jp983750s

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 photochemistry of CH3OH(a) and CH3O(a) adsorbed on TiO2 and the effect uf O-2 have been studied by infrared spectroscopy and mass spectrometry. In the absence of O-2, CH3OH(a) desorbs molecularly, while CH3O(a) decomposes to form CH2O(g) under UV irradiation. The rate of CH3O(a) decomposition reaches maximum in the initial stage of UV irradiation and then decreases significantly. On the other hand, for the reaction in O-2, the behavior of CH3O(a) depletion upon UV irradiation is very different, giving rise to adsorbed HCOO(a) and H2O(a). A radical mechanism is proposed to explain the variation of CH3O(a) depletion upon UV irradiation, the role of O-2, and the formation of the reaction products.

引用

页码：2439 / 2444

页数：6

共 28 条

[1] [Anonymous], 1990, DEGUSSA TECHNICAL B, V56, P13
[2] WIDE TEMPERATURE-RANGE IR SPECTROSCOPY CELL FOR STUDIES OF ADSORPTION AND DESORPTION ON HIGH AREA SOLIDS
BASU, P
BALLINGER, TH
YATES, JT
[J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 1988, 59 (08) : 1321 - 1327
[3] PHOTOOXIDATION OF METHANOL USING V2O5/TIO2 AND MOO3/TIO2 SURFACE OXIDE MONOLAYER CATALYSTS
CARLSON, T
GRIFFIN, GL
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (22) : 5896 - 5900
[4] TITANIUM-DIOXIDE PHOTOSENSITIZED REACTIONS STUDIED BY DIFFUSE REFLECTANCE FLASH-PHOTOLYSIS IN AQUEOUS SUSPENSIONS OF TIO2 POWDER
DRAPER, RB
FOX, MA
[J]. LANGMUIR, 1990, 6 (08) : 1396 - 1402
[5] HETEROGENEOUS PHOTOCATALYSIS
FOX, MA
DULAY, MT
[J]. CHEMICAL REVIEWS, 1993, 93 (01) : 341 - 357
[6] CHEMICAL REACTIONS INVOLVING HOLES AT ZINC OXIDE SINGLE CRYSTAL ANODE
GOMES, WP
FREUND, T
MORRISON, SR
[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1968, 115 (08) : 818 - &
[7] HERZBERG G, 1950, MOLECULAR SPECTRA MO, P446
[8] ENVIRONMENTAL APPLICATIONS OF SEMICONDUCTOR PHOTOCATALYSIS
HOFFMANN, MR
MARTIN, ST
CHOI, WY
BAHNEMANN, DW
[J]. CHEMICAL REVIEWS, 1995, 95 (01) : 69 - 96
[9] INFRARED SPECTROSCOPIC STUDIES OF THE REACTIONS OF ALCOHOLS OVER GROUP IVB METAL-OXIDE CATALYSTS .2. METHANOL OVER TIO2, ZRO2 AND HFO2
HUSSEIN, GAM
SHEPPARD, N
ZAKI, MI
FAHIM, RB
[J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1991, 87 (16): : 2655 - 2659
[10] LIN JT, UNPUB

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