Abstract
Recently an ultraviolet (UV) Raman spectrometer was assembled with the goal of improving Raman spectroscopy for catalysis and surface science studies. Using UV Raman spectroscopy, we have studied a spectrum of catalysts, such as coked reforming catalysts, ZSM-5 and USY zeolites treated with propene, sulfated zirconia catalysts: fresh and deactivated, and low-loading oxide catalysts. In particular, the chemical nature of coke species and the coke formation mechanism were investigated in detail. The results demonstrate that UV Raman spectroscopy can successfully avoid the surface fluorescence which often obscures normal Raman spectra. In addition, the Raman sensitivity is also greatly improved owing to the shorter excitation wavelength and resonance effect in some systems.
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