ADSORPTION OF WATER-VAPOR BY IRON-OXIDES .2. WATER ISOTHERMS AND X-RAY PHOTOELECTRON-SPECTROSCOPY

被引：26
|
作者：
CLARKE, NS
HALL, PG
机构：
[1] UNIV EXETER,DEPT CHEM,EXETER EX4 4RJ,DEVON,ENGLAND
[2] ATOM WEAP RES ESTAB,ALDERMASTON,BERKS,ENGLAND
来源：
LANGMUIR | 1991年 / 7卷 / 04期
关键词：
D O I：
10.1021/la00052a015
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Comparison between nitrogen and water vapor isotherms on alpha-and gamma-Fe2O3 suggests that at the BET point B stage in both cases the structure of the water adlayer is close-packed and nonlocalized. Significant hysteresis and irreversibility on desorption probably reflect, particularly with gamma-Fe2O3, reaction or rehydration effects. Wide energy (survey) X-ray photoelectron spectroscopy (XPS) scans of haematite and magnetite surfaces show the presence of adsorbed water down to pressures as low as 10(-10) mbar after pumping overnight. This conclusion is confirmed by laser induced ion mass analysis (LIMA) experiments. With magnetite the estimated ratio of surface OH to surface O2- from XPS is about 2.
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页码：678 / 682
页数：5
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