標題: MgO nanoparticles confined in ZIF-8 as acid-base bifunctional catalysts for enhanced glycerol carbonate production from transesterification of glycerol and dimethyl carbonate
作者: Chang, Cheng-Wei
Gong, Zi-Jie
Huang, Nai-Chieh
Wang, Cheng-Yu
Yu, Wen-Yueh
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Metal-organic-framework;Metal oxide nanoparticle;Nanoconfinement;Transesterification;Acid-base bifunctional catalyst
公開日期: 1-七月-2020
摘要: MgO-loaded ZIF-8 catalysts (MgO@ZIF-8) with various MgO loadings were prepared and characterized using atomic absorption spectroscopy (AAS), powder X-ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FT-IR), N-2 sorption isotherms, field-emission transmission electron microscopy (FE-TEM), and thermogravimetric analysis (TGA). Our results indicate that MgO nanoparticles could deposit onto the ZIF-8 surface with high atom efficiency while maintaining the ZIF-8 structure through a wet-impregnation and calcination process. It is suggested that the surface sites and microporosity of ZIF-8 support provide an adequate environment for the initial deposition of Mg precursor and subsequent growth of MgO nanoparticles through a nanoconfinement effect. MgO@ZIF-8 catalysts were tested for catalytic transesterification of glycerol and dimethyl carbonate to yield glycerol carbonate. It is found that the 50 wt% MgO@ZIF-8 catalyst display an improved catalytic activity than those of MgO and ZIF-8. Furthermore, the MgO@ZIF-8 catalysts showed higher catalytic activities than their physically-mixed counterparts, indicative of a synergistic effect between MgO and ZIF-8, which is explained by a proposed mechanism based on acid-base bifunctional sites on the surface.
URI: http://dx.doi.org/10.1016/j.cattod.2019.03.007
http://hdl.handle.net/11536/154634
ISSN: 0920-5861
DOI: 10.1016/j.cattod.2019.03.007
期刊: CATALYSIS TODAY
Volume: 351
起始頁: 21
結束頁: 29
顯示於類別:期刊論文