Study of ceria sulfation
Study of ceria sulfation
复制标题
DOI：
10.1016/s0926-3373(96)00040-9
复制
发表时间：
1997-02
影响因子：
22.1
通讯作者：
M. Waqif;P. Bazin;O. Saur;J. Lavalley;G. Blanchard;O. Touret
中科院分区：
文献类型：
--
作者：
M. Waqif;P. Bazin;O. Saur;J. Lavalley;G. Blanchard;O. Touret
用重量法和红外光谱法研究了二氧化铈对二氧化硫的氧化吸附。二氧化硫氧化产生两种主要类型的硫酸盐：表面硫酸盐和块状硫酸盐。前者在1400-1340 cm−1范围内有红外吸收峰，后者在1200 cm−1附近有一个很宽的吸收带，其相对含量取决于样品比表面积和硫酸盐生成总量。将硫酸盐的热稳定性和可还原性与其他氧化物上形成的硫酸盐进行了比较。研究还发现，在没有O2加成的情况下，SO2被吸附的物种可以被氧化成硫酸盐，同时伴随的CeO2的还原也被UV-Vis反射光谱所证实。
The oxidative adsorption of SO2on ceria has been studied using gravimetry and IR spectroscopy. SO2oxidation gives rise to two main types of sulfates: surface and bulklike species. The former are characterized by IR bands in the 1400–1340 cm−1range 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 SO2adsorbed species into sulfate can occur without O2addition, a concomitant ceria reduction then being evidenced by UV-visible reflectance spectroscopy.