Molar Entropy and Enthalpy of CO Adsorbed in Zeolites as Derived from VTIR Data: Role of Intermolecular Modes

Edoardo Garrone; Carlos Otero Areán; Montserrat Rodríguez Delgado; Barbara Bonelli

doi:10.1002/open.202000019

Molar Entropy and Enthalpy of CO Adsorbed in Zeolites as Derived from VTIR Data: Role of Intermolecular Modes

ChemistryOpen. 2020 May 20;9(5):599-606. doi: 10.1002/open.202000019. eCollection 2020 May.

Authors

Edoardo Garrone¹, Carlos Otero Areán², Montserrat Rodríguez Delgado², Barbara Bonelli¹

Affiliations

¹ Department of Applied Science and Technology and INSTM Unit of Torino Politecnico Politecnico di Torino Corso Duca degli Abruzzi, 24 10129 Torino Italy.
² Department of Chemistry University of the Balearic Islands Palma de Mallorca 07122 Spain.

Abstract

Detailed analysis of recently reported variable-temperature IR (VTIR) spectra of carbon monoxide adsorbed in alkaline zeolites shows how, not only the corresponding values of standard adsorption enthalpy ( ${Δ H}^{0}$ ) and entropy ( ${Δ S}^{0}$ ) can be obtained, but also the thermodynamic values of molar entropy and enthalpy which characterize the adsorbed gas phase. In addition, it is shown that the so obtained molar entropy data can lead to new insights into soft molecular modes, which would be hardly accessible by conventional IR spectroscopic techniques.

Keywords: IR spectroscopy; adsorption enthalpy; soft molecular modes.; thermodynamic values; zeolites.