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Thermodynamics of Hydrogen Bonding between CO and the Supercage Brønsted Acid Sites of the H‐Y Zeolite − Studies from Variable Temperature IR Spectrometry
Author(s) -
Otero Areán Carlos,
Manoilova Olga V.,
Tsyganenko Alexey A.,
Turnes Palomino Gemma,
Peñarroya Mentruit Margarita,
Geobaldo Francesco,
Garrone Edoardo
Publication year - 2001
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200107)2001:7<1739::aid-ejic1739>3.0.co;2-m
Subject(s) - chemistry , zeolite , brønsted–lowry acid–base theory , faujasite , standard molar entropy , infrared spectroscopy , enthalpy , carbon monoxide , standard enthalpy of formation , adduct , infrared , inorganic chemistry , hydrogen , thermodynamics , organic chemistry , catalysis , physics , optics
A procedure was developed for studying the thermodynamics involved in the interaction of carbon monoxide with Brønsted acid sites in zeolites, without the need for microcalorimetric measurements. The observables are the integrated infrared intensity of the C−O stretching mode of the OH ··· CO adducts, temperature, and equilibrium pressure. These quantities were measured by means of variable‐temperature IR spectroscopy, using a home made IR cell equipped with a capacitance pressure gauge. Interaction of CO with Brønsted acid sites at the supercage of the faujasite‐type H‐Y zeolite involves a standard enthalpy change, Δ H ° of −25.6 kJ mol −1 , and a standard entropy change, Δ S ° of −161 J mol −1 K −1 . These values were compared with the corresponding figures obtained from the calorimetric determination of CO adsorption on a number of metal oxides and zeolites.