Mingbo WuChina University of Petroleum, China
Dr. Mingbo Wu is a professor, Director of Heavy Oil Based New Carbon Materials Lab, College of Chemical Engineering, China University of Petroleum, China. His research interests have been focused on the development of new methodologies for synthesis of functional carbon materials, and their uses in catalysis, energy conversion/storage and environment protection. He received his first degree in chemistry from Liaocheng University of China in 1996, MEng degree from Institute of Coal Chemistry, Chinese Academy of Sciences in 1998, and PhD degree in chemical engineering from Dalian University of Technology in 2004. He has received a number of awards, including First Class Award for achievements in technological invention from China Petroleum and Chemical Industry Foundation, Runners-up Award for achievements in technological invention from the Education Ministry of China, Youth Science and Technology Award from Shandong Province, and the Young Teacher's Award from the Education Ministry of China. He has co-authored over 150 papers in peer-reviewed journals.
Title：Preparation and Application of Graphene-based Transition Metal Catalysts
SymposiumCatalyst
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Abstract
Transition metal catalysts are the most powerful tools for catalytic conversion in synthetic chemistry and industrial catalysis. However, problems in transition metal catalysts including agglomeration, high cost, toxicity and difficult to recycle largely hamper their practical applications. Therefore, developing efficient heterogeneous catalysts is crucial for the application of transition metal catalysts. With unique two-dimensional structure, great surface area and impressive mechanical strength, graphene and its derivatives have good future as supports for transition metal catalysts.
We developed transition metal nanoparticle catalysts deposited on reduced graphene oxide (RGO) used as heterogeneous catalysts. A rhodium nanoparticle catalyst supported on RGO (Rh/RGO) was prepared via one-pot liquid phase reduction method and applied in 1-hexene hydroformylation. Compared with other carbonaceous 1D (carbon nanotubes) and 3D (activated carbon) supports, the 2D Rh/RGO catalyst exhibited the highest 1-hexene conversion and the largest n/i ratio of 4.0. Based on the graphene nanosheets, we synthesized a bifunctional catalyst consisting of Au nanoparticles (~4.5 nm) and sulfated TiO2 nanoparticles (~8.0 nm) on RGO (Fig. 1a). The resulting Au–SO42–/TiO2–RGO was determined as a promoted and recyclable catalyst for alkene hydration. Besides cooperative catalytic effect between the Au and sulfated TiO2 nanoparticles, the versatile RGO support accounts for its excellent catalytic performance.
We also designed strategies to exploit transition metal complex catalysts immobilized on graphene support. By covalently bonding RuCl2(PPh3)3 onto graphene oxide (GO) through coordination interaction, a ruthenium supported catalyst was synthesized. The heterogeneous catalyst showed enhanced catalytic performance towards hydrogenation of olefins and ketones compared with the homogeneous RuCl2(PPh3)3 and could be recycled for several times without discernible loss of activity. Subsequently, we developed an in-situ method to synthesize and immobilize a copper (salen) complex on the surface of GO (Fig. 1b). Owing to the outstanding properties of the GO support and the robust immobilization strategy, the resulting Cu(salen)−f−GO catalyst was demonstrated to be highly effective for epoxidation of olefins and could be readily reused for successive twelve times without discernible activity and selectivity deterioration.
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