Browsing by Subject "Microwave heating"
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Item Optimized synthesis of PdAu bimetallic nanoparticles using microwave irradiation as heterogeneous catalysts for compositional dependent hydrogenation reaction(2016-05-19) Kunal, Pranaw; Humphrey, Simon M.; Jones, Richard A.Synthesis of atom-efficient, cost-effective, and recyclable catalysts is quintessential for large scale production of chemicals of strategic importance. Expertise of Humphrey research group in microwave assisted synthesis of noble metal nanoparticles (NPs) has been implemented for synthesis of PdAu NPs, and a thorough investigation of their catalytic performance for cyclohexene hydrogenation was completed. Different reaction times were evaluated for their effects on extent of alloying and size distributions of NPs. Varying concentration of metal precursors used during the synthesis of Pd₅₀Au₅₀ alloy NPs led to appreciable size tunability. Microwave heating (μWI) was also effective in rapidly exchanging organic functionalization of the synthesized Pd₅₀Au₅₀ alloy NPs from a polymeric to monomeric capping agent. A comparison of μWI and conventional heating (CvH) methods showed that μWI led to superior PdAu alloy NPs with better monodispersity and size control. Using optimized reaction conditions, relative compositions of the two metals were controlled over a wide range. Synthesized PdAu alloy NPs of different compositions were thoroughly characterized using a variety of techniques and then tested for catalytic hydrogenation of cyclohexene using a continuous flow gas phase reactor. Pd59Au41 alloy NPs showed the best catalytic performance among all the catalysts studied. Continuing efforts towards further improving Pd-containing bimetallic NPs systems are currently made with the future goal of comparing catalytic performances of PdAu NPs with PdAg NPs in order to develop more economical and versatile catalysts.