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

被引：28

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.

引用

页码：678 / 682

页数：5

共 15 条

[1] INFRARED AND VOLUMETRIC DATA ON ADSORPTION OF AMMONIA, WATER, AND OTHER GASES ON ACTIVATED IRON (III) OXIDE [J].