Two Coordination Modes of CO in Zeolites: A Temperature-Dependent Equilibrium

Carlos Otero Areán; Alexey A Tsyganenko; Estrella Escalona Platero; Edoardo Garrone; Adriano Zecchina

doi:10.1002/(SICI)1521-3773(19981204)37:22<3161::AID-ANIE3161>3.0.CO;2-B

Two Coordination Modes of CO in Zeolites: A Temperature-Dependent Equilibrium

Angew Chem Int Ed Engl. 1998 Dec 4;37(22):3161-3163. doi: 10.1002/(SICI)1521-3773(19981204)37:22<3161::AID-ANIE3161>3.0.CO;2-B.

Authors

Carlos Otero Areán¹, Alexey A Tsyganenko², Estrella Escalona Platero¹, Edoardo Garrone³, Adriano Zecchina³

Affiliations

¹ Departamento de Química, Universidad de las Islas Baleares, 07071 Palma de Mallorca (Spain), Fax: (+34) 971-173426.
² Institute of Physics, St. Petersburg University (Russia).
³ Dipartimento di Chimica Inorganica Chimica Fisica e Chimica dei Materiali, Università di Torino (Italy).

Abstract

CO interacts with exchangeable cations M⁺ (gray spheres in the picture) of zeolites to form M⁺ ⋅⋅⋅CO and M⁺ ⋅⋅⋅OC species (C: black; O: white) which are in a temperature-dependent equilibrium. For Na-ZSM-5 (M⁺ =Na⁺ ) the difference in interaction energy amounts to 3.8 kJ mol^-1 , as determined by means of variable-temperature FT-IR spectroscopy.

Keywords: Adsorption; Carbon monoxide; Heterogeneous catalysis; IR spectroscopy; Zeolites.