Operando spectroscopy of heterogeneous catalysts

   For understanding reaction mechanism of heterogeneous catalysts at the atomic/molecular levels, it is essential to investigate the surface chemical reactions using surface/interface sensitive spectroscopic techniques. Spectroscopy of the working catalyst provides direct information about catalytic reaction processes. Such experimental technique is called “operando spectroscopy” and it has attracted much attentions in recent years.

   By combining ultra-high vacuum techniques with operando spectroscopy, we aim to understand complex reaction processes of heterogeneous catalysis in detail. We have investigated surface chemical states and reaction mechanisms of catalysts under operation condition by means of near ambient-pressure photoelectron spectroscopy and polarization-modulation infrared reflection-absorption spectroscopy.

   In particular, we focus on catalytic conversion of inert molecules, such as carbon dioxide and methane, into industrially valuable molecules. One of our goals is to understand reaction mechanism of heterogeneous catalysis through the operando spectroscopy of well-defined model catalysts. In addition, we have also conducted operando observation of reaction on real catalysts to obtain knowledge of heterogeneous catalysis.