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Effective Utilization of in Situ Generated Hydroperoxide by a Co–SiO2@Ti–Si Core–Shell Catalyst in the Oxidation Reactions
ACS Catalysis ( IF 12.9 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1021/acscatal.7b03259
Meng Liu 1, 2 , Song Shi 1 , Li Zhao 1, 2 , Min Wang 1 , Guozhi Zhu 1, 2 , Xi Zheng 1 , Jin Gao 1 , Jie Xu 1
Affiliation  

A core–shell catalyst (Co–SiO2@Ti–Si) with cobalt-based SiO2 nanocomposite (Co–SiO2) as the core and Ti-doped mesoporous silica as the shell was designed to catalyze a one-pot reaction of sulfide oxidation with in situ generated hydroperoxide. The catalyst was characterized by SEM, TEM, UV–vis spectroscopy, and XPS, among other methods. Compared to Co–SiO2 and the physical mixture of the two components (Co–SiO2 + Ti–Si), the core–shell catalyst significantly enhanced the reaction rate of the sulfide oxidation. The utilization efficiency of the hydroperoxide was an important factor responsible for the differences in the reaction rates. A further mechanism study showed that the improvement of the efficiency was due to the existence of a coordination pathway. The core–shell structure of a bifunctional catalyst represents a strategy for improving the utilization efficiency of hydroperoxide.

中文翻译:

Co-SiO 2 @ Ti-Si核壳催化剂在氧化反应中有效利用原位生成的过氧化氢

以钴基SiO 2纳米复合材料(Co-SiO 2)为核,钛掺杂介孔二氧化硅为壳的核-壳催化剂(Co-SiO 2 @ Ti-Si)被设计用于催化一锅反应。用原位生成的氢过氧化物进行硫化物氧化。除其他方法外,还通过SEM,TEM,UV-vis光谱和XPS对催化剂进行了表征。与Co-SiO 2和两种成分的物理混合物(Co-SiO 2相比)+ Ti-Si),核-壳催化剂显着提高了硫化物氧化的反应速率。氢过氧化物的利用效率是引起反应速率差异的重要因素。进一步的机理研究表明,效率的提高归因于协调途径的存在。双功能催化剂的核-壳结构代表了一种提高氢过氧化物利用效率的策略。
更新日期:2017-12-21
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