期刊
CATALYSTS
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/catal11030304
关键词
MOFs; ZIF-67; CeO2; adipic acid; green catalyst
资金
- National University of Sciences and Technology (NUST) Pakistan
- Higher Education Commission (HEC) Pakistan [2017/HEC/NRPU/10482]
- Key Program of the Chinese Academy of Sciences [KFZD-SW-320]
- Natural Science Foundation of China [21471147]
Efficient chemical processes rely on catalysts to activate pathways and maximize product yields. This study explored the catalytic activity of CeO2 nanoparticles in two configurations, with one showing promising results in the oxidation of cyclohexene to adipic acid, while the other did not exhibit catalytic activity. The findings suggest the potential of porous ZIF-67/CeO2 as a viable option for environmentally-friendly synthesis of various chemicals.
Greatly efficient chemical processes are customarily based upon a catalyst activating the process pathway to achieve higher yields of a product with desired specifications. Catalysts capable of achieving good performance without compromising green credentials are a pre-requisite for the development of a sustainable process. In this study, CeO2 nanoparticles were tested for their catalytic activity with two different configurations, one as a hybrid of CeO2 nanoparticles with Zeolitic Immidazole Framework (ZIF-67) and second being doped Cu cations into CeO2 nanoparticles. Physicochemical and catalytic activity was investigated and compared for both systems. Each hybrid was synthesized by embedding the CeO2 nanoparticles into the microporous structure of ZIF-67, and Cu doped CeO2 nanoparticles were prepared by a facile hydrothermal route. As a catalytic test, it was employed for the oxidation of cyclohexene to adipic acid (AA) as an alternative to expensive noble metal-based catalysts. Heterogeneous ZIF-67/CeO2 found catalytical activity towards the oxidation of cyclohexene with nearly complete conversion of cyclohexene into AA under moderate and co-catalyst free reaction conditions, whereas Cu doped CeO2 nanoparticles have shown no catalytic activity towards cyclohexene conversion, depicting the advantages of the porous ZIF-67 structure and its synergistic effect with CeO2 nanoparticles. The large surface area catalyst could be a viable option for the green synthesis of many other chemicals.
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