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A high-vacuum cell attached to the external part of a BOMEM DA3 FTIR instrument is used for in situ transmission experiments on self-supporting zeolite wafers of 15-20 µ thickness, in the spectral range between 20 and 13800 cm"1 11. Results on zeolites Linde 4A and Linde 5A and on different Ag+-exchanged zeolites A in presence of reactants such as H20, D20, H2, D2, CO, and C02 demonstrate the high-quality information achieved by this technique. We have been able to obtain clear evidence for the appearance of Evans holes in the H20 and D20 stretching vibration on a zeolite A. Furthermore the stretching plus bending bands, the bending plus librational combination bands, and new OH stretching frequencies have been observed. Far-IR spectra of the silver species, the development of new structural OH and OD groups, and the overall transmission have been followed during the reduction of Ag-A zeolites with H2 and D2. At different stages of reduction, interaction of CO and C02 has been probed and revealed interesting information on structural changes and kinetics under different conditions.The method and data reported open a wide field for detailed investigations on the interaction of metal exchanged zeolites with gaseous reactants.

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