催化作用
甲醇
碳酸二甲酯
硼氢化钠
超声
氧化铈
表面改性
选择性
化学
无机化学
氧化还原
化学工程
核化学
材料科学
有机化学
色谱法
工程类
物理化学
作者
Tachatad Kulthananat,Pattaraporn Kim-Lohsoontorn,Panpailin Seeharaj
标识
DOI:10.1016/j.ultsonch.2022.106164
摘要
This study developed a facile and effective approach to engineer the surface properties of cerium oxide (CeO2) nanospindle catalysts for the direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol. CeO2 nanospindles were first prepared by a simple precipitation method followed by wet chemical redox etching with sodium borohydride (NaBH4) under high intensity ultrasonication (ultrasonic horn, 20 kHz, 150 W/cm2). The ultrasonically assisted surface modification of the CeO2 nanospindles in NaBH4 led to particle collisions and surface reduction that resulted in an increase in the number of surface-active sites of exposed Ce3+ and oxygen vacancies. The surface modified CeO2 nanospindles showed an improvement of catalytic activity for DMC formation, yielding 17.90 mmol·gcat−1 with 100 % DMC selectivity. This study offers a simple and effective method to modify a CeO2 surface, and it can further be applied for other chemical activities.
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