A Combined DRIFTS and DR-UV–Vis Spectroscopic In Situ Study on the Trapping of CH3I by Silver-Exchanged Faujasite Zeolite

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Abstract
The mechanism of CH3I adsorption and thermal decomposition by a Ag/Y sorbent with 23 wt% of silver and Si/Al ratio of 2.5 was investigated using two different spectroscopic techniques. On the one hand, DR-UV-Vis spectroscopy was used in order to monitor the evolution of silver species and their transformation to silver iodide AgI clusters during increasing exposure to gaseous methyl iodide and upon heating under dry and wet atmospheres. On the other hand, the evolution of adsorbed organic species was investigated under similar conditions by DRIFTS. The latter data were correlated with the evolution of gaseous products in order to elucidate the mechanistic pathways involved in the trapping and catalytic decomposition of CH3I.
Funding Information
  • Agence Nationale de la Recherche (ANR-11-RSNR-0013-01)
  • Seventh Framework Programme (323217)

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