Preparation and Characterization of Carbon Nitride Supported Pt Catalyst and Its Catalytic Performance on Hydrogenation of Cinnamaldehyde
Abstract: Layered carbon nitride g-C3N4 was prepared through high temperature polymerization of urea, and highly dispersive Pt nanoparticles were loaded onto g-C3N4 by ethylene glycol reduction to fabricate Pt/g-C3N4 catalyst. The catalyst was characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, surface area/porosity analysis and inductively coupled plasma atomic emission spectrometer (ICP-AES), and tested in the hydrogenation of cinnamelaldehyde. The results indicated that the support contains a large amount of N-containing groups which help to stabilize metal nanoparticles effectively; Pt nanoparticles uniformly dispersed in the surface of the g-C3N4 and its size is between 2 - 3 nm; the calcination temperature in g-C3N4 preparation had a significant effect on the performance of the catalyst for selective hydrogenation. Pt supported on g-C3N4 being calcinated at 550˚C exhibited an appreciable activity, 30% conversion of cinnamic aldehyde and 66% selectivity for cinnamic alcohol under relatively mild condition. No obvious deterioration of the activity is observed after three times of usage, implying a good stability of the catalyst.
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