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|Title:||A few-layer graphene-graphene oxide composite containing nanodiamonds as metal-free catalysts|
|Citation:||Journal of Materials Chemistry A, 2014; 2(29):11349-11357|
|Publisher:||Royal Society of Chemistry|
|Tung Tran Thanh, Housseinou Ba, Lai Truong-Phuoc, Jean-Mario Nhut, Ovidiu Ersen, Dominique Begin, Izabela Janowska, Dinh Lam Nguyen, Pascal Grangerd and Cuong Pham-Huu|
|Abstract:||We report a high yield exfoliation of few-layer-graphene (FLG) with up to 17% yield from expanded graphite, under 5 h sonication time in water, using graphene oxide (GO) as a surfactant. The aqueous dispersion of GO attached FLG (FLG–GO), with less than 5 layers, is used as a template for further decoration of nanodiamonds (NDs). The hybrid materials were self-organized into 3D-laminated nanostructures, where spherical NDs with a diameter of 4–8 nm are homogeneously distributed on the surface of the FLG–GO complex (referred to as FLG–GO@NDs). It was found that GO plays a dual role, it (1) mediated exfoliation of expanded graphite in aqueous solution resulting in a FLG–GO colloid system, and (2) incorporated ND particles for the formation of composites. A high catalytic performance in the dehydrogenation of ethyl-benzene on FLG–GO@ND metal-free catalyst is achieved; 35.1% of ethylbenzene conversion and 98.6% styrene selectivity after a 50 h reaction test are observed which correspond to an activity of 896 mmolST gcatalyst−1 h−1, which is 1.7 and 5 times higher than those of the unsupported NDs and traditional catalysts, respectively. The results demonstrate the potential of the FLG–GO@ND composite as a promising catalyst for steam-free industrial dehydrogenation applications.|
|Rights:||This journal is © The Royal Society of Chemistry 2014|
|Appears in Collections:||Chemistry publications|
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