DYNAMICAL STUDIES OF ZEOLITIC PROTONS AND INTERACTIONS WITH ADSORBATES BY PICOSECOND INFRARED-SPECTROSCOPY

We have investigated zeolite-adsorbate interactions with time-resolved (picosecond) non-linear infrared spectroscopy, In these experiments, the zeolite hydroxyl (the catalytically active, acid site) is vibratio nally excited after which the energy relaxation can be monitored real- time. The effect of the presence of adsorbates on energy relaxation ra tes and pathways provides information on catalyst-adsorbate interactio n dynamics. Furthermore, the effect of the presence of adsorbates on t he homogeneous linewidth, investigated with infrared hole-burning spec troscopy, provides information on the nature of the interaction potent ial. (C) 1997 Elsevier Science B.V.