Add time:08/04/2019         Source:sciencedirect.com

The direct hydroxylation of benzene to phenol under H2O2 is one of the most important research topics in catalytic synthesis and green chemistry. As a conventional and widely available catalyst, vanadyl (IV) acetylacetonate [VO(acac)2] shows remarkable catalytic efficiency for the process, however is a typical homogeneous catalyst. In this work, ordered mesoporous silica (KIT-6) was applied to a new catalytic support to immobilize VO(acac)2. Several chacterization techniques including N2 adsorption–desorption, small and wide angle XRD, TEM, FT-IR, and XPS, have been used to analyze the physiochemical properties of the synthesized materials. VO(acac)2 was solidly immobilized on the amine-functionalized KIT-6 via the formation of Schiff base, while the original ordered mesoporous structure of KIT-6 has been remained after the incorporation of VO(acac)2. In the direct hydroxylation of benzene under H2O2, the KIT-6-NH2-V materials showed catalytic activities. The maximum catalytic yield of phenol obtained at 60 °C was ca. 17%. Furthermore, under the same reaction conditions, the immobilized VO(acac)2 catalyst exhibited superior catalytic activity to the catalysts supported on other two typical ordered mesoporous silicas (SBA-15 and FDU-12).

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