Applications Of Fourier Transform Infrared Spectroscopy To In Situ Catalyst Surface Studies

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Abstract
Fourier transform infrared spectroscopy (FTIR) is a powerful tool for studying surface species present on supported catalysts during normal reaction conditions of high temperature and/or pressure. We have used a special high-throughput optical bench to optimize the sensitivity of the system for high optical density catalyst samples. The infrared cell is designed to operate at high vacuum for adsorption studies or as a recycle-flow reactor. Improvements in spectral subtractions have been obtained by the precise repositioning of samples in the IR beam. The enhanced performance resulting from these modifications has been instrumental in improving the sensitivity for infrared surface studies of the reactions C6H6 + 3H2 ⇔ C6H12 and 2C0 + 02 → 2CO2 over a Pt/A1203 catalyst. The bonding and geometry of benzene chemisorbed on the Pt surface have been determined from the infrared spectra. Simultaneous reaction rate and surface coverage measurements have also been made during CO oxidation on Pt/A1203. Hysteresis effects in both reaction rate and CO surface coverage are observed. The IR spectra indicate that islands of CO form on the Pt surface during reaction.

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