Two distinguishable lithium sites in the zeolite Li-ZSM-5 as revealed by adsorption of CO: an infrared spectroscopic and thermodynamic characterisation

Literature Information

Publication Date 2003-06-03
DOI 10.1039/B303613H
Impact Factor 3.676
Authors

B. Bonelli, E. Garrone, B. Fubini, B. Onida, M. Rodríguez Delgado, C. Otero Areán


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Abstract

By combining FTIR spectroscopic and microcalorimetric measurements on adsorbed CO, two lithium sites were found to be present in the zeolite Li-ZSM-5. Both of these sites, LiA and LiB, form Li(CO)+ monocarbonyl species with adsorbed CO; the corresponding C–O stretching frequencies are 2193 and 2187 cm−1, respectively. Formation of LiA(CO)+ involves an estimated adsorption enthalpy of ΔH° ≅ − 44 kJ mol−1, while for LiB(CO)+ the corresponding value is evaluated to be ΔH° ≅ −18 kJ mol−1. The large difference between these ΔH° values is explained in terms of an endothermic process occurring during formation of the LiB(CO)+ species, which involves a slight movement of the corresponding Li+ ion (away from its equilibrium position among oxygen anions of the zeolite framework). Formation of dicarbonyls is also discussed, as well as formation of O-bonded Li(OC)+ species.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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