OXYGEN-EXCHANGE REACTIONS OVER CERIUM OXIDE - AN FT-IR STUDY

被引：98

作者：

LI, C ^{[1
]}

DOMEN, K ^{[1
]}

MARUYA, K ^{[1
]}

ONISHI, T ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,4259 NAGATSUTA,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

JOURNAL OF CATALYSIS | 1990年 / 123卷 / 02期

关键词：

D O I：

10.1016/0021-9517(90)90140-F

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：

Oxygen (site and isotope) exchange reactions over well-outgassed and partially reduced cerium oxide were examined in the temperature range 200-373 K by means of Fourier-transform infrared (FT-IR) spectroscopy. Isotopic exchange between gaseous O2 and lattice oxygen of the cerium oxide does not occur at the temperature below 373 K. Site exchange via gaseous O2 with adsorbed superoxide (O2-ads) species was found to be very fast on both the outgassed and partially reduced surfaces even at 200 K, but site exchange between gaseous O2 and adsorbed peroxide (O22-ads) species does not take place in the temperature range 200-373 K. The isotopically exchanged superoxide species (16O18Oads-) with characteristic IR bands at 2175 and 1095 cm-1 are readily formed from a mixture of 1602 + 1$02 adsorption over well-outgassed and partially reduced cerium oxides. It is concluded that isotope exchange reactions proceed via adsorbed superoxide species and the exchange reaction is presumed to involve a tetraoxygen intermediate as the result of the reaction of gaseous O2 with adsorbed superoxide species. © 1990.

引用

页码：436 / 442

页数：7

共 28 条

[1] MATRIX REACTIONS OF CESIUM ATOMS WITH OXYGEN MOLECULES - INFRARED-SPECTRUM AND VIBRATIONAL ANALYSIS OF CS+O2- - INFRARED OBSERVATION OF CS+O22-CS+ AND CS+O4- - THEORETICAL STRUCTURE ELUCIDATION OF M+O4-
ANDREWS, L
HWANG, JT
TRINDLE, C
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1973, 77 (08) : 1065 - 1073
[2] BARRY IJ, 1960, P R SOC LONDON A, V225, P124
[3] CATALYTIC ACTIVATION OF DIOXYGEN.
Boreskov, G.K.
[J]. Catalysis: Science and Technology, 1982, 3 : 39 - 137
[4] BUSCA G, 1983, J MOL STRUCT, V105, P11
[5] CHARACTERIZATION AND REACTIVITY OF MONONUCLEAR OXYGEN SPECIES ON OXIDE SURFACES
CHE, M
TENCH, AJ
[J]. ADVANCES IN CATALYSIS, 1982, 31 : 77 - 133
[6] CHE M, 1974, CHEM PHYS LETT, V28, P387, DOI 10.1016/0009-2614(74)80372-6
[7] OXYGEN SPECIES ADSORBED ON CEO2-SIO2 SUPPORTED CATALYSTS
CHE, M
KIBBLEWHITE, JF
TENCH, AJ
[J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1973, 69 (05): : 857 - 863
[8] CHE M, 1984, REV CHIM MINER, V21, P669
[9] CHARACTERIZATION AND REACTIVITY OF MOLECULAR-OXYGEN SPECIES ON OXIDE SURFACES
CHE, M
TENCH, AJ
[J]. ADVANCES IN CATALYSIS, 1983, 32 : 1 - 148
[10] EFFECT OF PLATINUM DEPOSITS ON OXYGEN-ADSORPTION AND OXYGEN ISOTOPE EXCHANGE OVER VARIOUSLY PRETREATED, ULTRAVIOLET-ILLUMINATED POWDER TIO2
COURBON, H
HERRMANN, JM
PICHAT, P
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1984, 88 (22) : 5210 - 5214

← 1 2 3 →