Study of ceria sulfation

被引：275

作者：

Waqif, M

Bazin, P

Saur, O

Lavalley, JC

Blanchard, G

Touret, O

机构：

[1] UNIV PARIS 06,ISMRA,URA CNRS 414,CATALYSE & SPECTROCHIM LAB,F-14050 CAEN,FRANCE

[2] RHONE POULENC,CTR RECH,F-93308 AUBERVILLIERS,FRANCE

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1997年 / 11卷 / 02期

关键词：

ceria; sulfation; FT-IR spectroscopy; UV-visible reflectance spectroscopy;

D O I：

10.1016/S0926-3373(96)00040-9

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 oxidative adsorption of SO2 on ceria has been studied using gravimetry and IR spectroscopy. SO2 oxidation gives rise to two main types of sulfates: surface and bulklike species. The former are characterized by IR bands in the 1400-1340 cm(-1) range while the latter lead to a very broad band near 1200 cm(-1). Their relative amount depends on the sample surface area and the total sulfate amount formed. The sulfate thermal stability and reducibility are compared to those of sulfate species formed on other oxides. It is also found that oxidation of SO, adsorbed species into sulfate can occur without O-2 addition, a concomitant ceria reduction then being evidenced by UV-visible reflectance spectroscopy.

引用

页码：193 / 205

页数：13

共 19 条

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