摘要
采用XPS实验技术对不同制备条件下制得的S2O82-/ZrO2 SiO2 Sm2O3类固体超强酸催化剂的表面元素电子结合能及表面元素的相对含量进行了分析对比。结果表明:浸渍S2O82-使得S2p,Zr3d结合能提高;加入少量氧化钐制得催化剂的S2p,Zr3d结合能略大于不加稀土的样品,说明少量的稀土元素改变了催化剂表面的化学状态,使催化剂表面元素正极化程度提高;焙烧使得催化剂表面S,Zr原子作用力增强,金属原子的正极化程度增强。不同该类催化剂的Si2p结合能基本相同,说明S未与Si结合,二氧化硅不是该类催化剂的活性组份。
The binding energy and relative content of surface elements of the catalyst S_2O_8^(2-)/ZrO_2-SiO_2-Sm_2O_3 prepared under different preparing conditions were analyzed by XPS. It was found that the binging energy of S2p, Zr3d and the activity was promoted after immerged by S_2O_8^(2-) and added by Sm_2O_3, it seems that the chemical situation of the catalyst surface was changed so that the activity and stability was improved, calcination also has the same action. S is not combined with SiO_2. The function of SiO_2 just enlarge the specific surface area of the catalyst.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第z2期79-83,共5页
Journal of the Chinese Society of Rare Earths
基金
内蒙古自然科学基金项目(20010901 13)
