催化作用
化学
沸石
阳离子聚合
选择性
氢键
无机化学
氯化物
表面改性
氢
过氧化氢
物理化学
高分子化学
有机化学
分子
作者
Yunkai Yu,Zijie Tang,Wei Liu,Jia Wang,Zhen Chen,Kaixu Shen,Rui Wang,Haoxin Liu,Xingliang Huang,Yueming Liu
标识
DOI:10.1016/j.apcata.2019.117270
摘要
Cationic modification was applied to Ti-MWW zeolite via the treatment of potassium chloride (KCl). Compared to the original Ti-MWW zeolite, the K-modified Ti-MWW sample (Ti-MWW-K) exhibited much improved catalytic activity, selectivity and stability in the liquid-phase epoxidation of alkenes. Our investigation shows that the K+ modification has negligible effect on the physicochemical properties, the state of the Ti active sites and the Lewis acidic strength of the Ti-MWW catalyst. Our result has further indicated that breaking of the hydrogen-bonding interactions between the Oβ atom of H2O2 (Hα-Oα-Oβ-Hend) and the H atom of the silanols adjacent to the Ti-OH (SiOH(HOTi)) in the Ti-MWW-K zeolite promotes the activation of H2O2, which is responsible for its superior catalytic oxidation activity. This finding helps shed light on utilizing the hydrogen-bonding interactions based on the titanosilicates/H2O2 system to achieve the excellent catalytic oxidation performance.
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