摘要
用 Ｘ Ｐ Ｓ、 Ｔ Ｐ Ｄ Ｍ Ｓ等方法研究乙烯环氧化银催化剂表面的吸附态和 Ａｇ 的价态，并关联其选择性．结果表明催化剂表面吸附适量的 Ｃ Ｏ２－３ 和 Ｏ Ｈ－ 物种能促进 Ａｇ 电子输出功的增加，使表面 Ａｇ 原子带部分正电荷，从而抑制带负电荷较多的具有深度氧化和破坏氧化的 Ｏδ－ 的生成和迁移，进而提高乙烯环氧化的选择性．
XPS and TPD MS methods have been employed to study the surface adspecies and the valence state of silver on the silver catalysts for ethylene epoxidation. The results indicated that the adsorption of suitable amount of CO 2- 3 and OH - species on the surface of the catalysts brought about promoted an increase in the work function of silver particles and made them partially positively charged. This can suppress the formation and migration of O δ - with partially negative charge and responding for the deep oxidation, thus improve the selectivity for ethylene epoxidation.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第5期721-725,共5页
Journal of Xiamen University：Natural Science
