Adsorption and reaction of hydrogen sulfide on thin-film cerium oxide

被引：47

作者：

Mullins, D. R. ^{[1
]}

McDonald, T. S. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 21期

关键词：

cerium; thermal desorption spectroscopy; soft x-ray photoelectron spectroscopy; hydrogen sulfide;

D O I：

10.1016/j.susc.2007.08.007

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 adsorption and reaction of hydrogen sulfide, H2S, have been studied on cerium oxide thin films that were vapor deposited on Ru(0001). The behavior of the H2S was examined as a function of Ce oxidation state. H2S weakly chemisorbs on fully oxidized CeO2 desorbing near 155 K. Hydrogen from the H2S reacts with the surface O to desorb as water between 200 K and 450 K. When ca. 20% of the Ce4+ is reduced to Ce3+ more H2S dissociates to -OH and -SH and water is produced near 580 K. When the ceria is ca. 70% reduced, water formation is suppressed and H-2 desorbs near 580 K. S 2p photoelectron spectroscopy indicates the decomposition of H2S into -SH and then -S as the sample is annealed from 100 K to 600 K. O Is photoemission indicated the presence of H2O and OH. Published by Elsevier B.V.

引用

页码：4931 / 4938

页数：8

共 38 条

[1] CATALYTIC REDUCTION OF CO WITH HYDROGEN-SULFIDE .2. ADSORPTION OF H2O AND H2S ON ANATASE AND RUTILE [J].