Determining the Ce2O2S-CeOx phase boundary for conditions relevant to adsorption and catalysis

被引：23

作者：

Fertizz, RM ^{[1
]}

Gorte, RJ ^{[1
]}

Vohs, JM ^{[1
]}

机构：

[1] Univ Penn, Dept Chem & Biomol Engn, Philadelphia, PA 19104 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2003年 / 43卷 / 03期

关键词：

ceria; cerium oxysulfide; sulfur; adsorption;

D O I：

10.1016/S0926-3373(02)00323-5

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 interaction of sulfur with ceria under highly reducing conditions was investigated. The phase boundary between CeO1.83 and Ce2O2S was determined for temperatures between 873 and 1073 K. This data was used to derive an empirical equation for DeltaG(f)degrees of Ce2O2S in this temperature range. This equation along with thermodynamic data for cerium oxides and sulfides obtained form the literature was used to predict Ce-O-S phase diagrams at 873 and 973 K. These phase diagrams provide insight into the mechanism of the deactivation of ceria-based catalysts by sulfur under reducing conditions. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：273 / 280

页数：8

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