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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Direct Calorimetric Measurement of Enthalpy of Adsorption of Carbon Dioxide on CD-MOF-2, a Green Metal-Organic Framework

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Author(s):
Wu, Di [1, 2] ; Gassensmith, Jeremiah J. [3] ; Gouvea, Douglas [1, 2, 4] ; Ushakov, Sergey [1, 2] ; Stoddart, J. Fraser [3] ; Navrotsky, Alexandra [1, 2]
Total Authors: 6
Affiliation:
[1] Univ Calif Davis, NEAT ORU, Davis, CA 95616 - USA
[2] Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 - USA
[3] Northwestern Univ, Dept Chem, Ctr Chem Integrated Syst, Evanston, IL 60208 - USA
[4] Univ Sao Paulo, Escola Politecn, Dept Met & Mat Engn, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of the American Chemical Society; v. 135, n. 18, p. 6790-6793, MAY 8 2013.
Web of Science Citations: 73
Abstract

The enthalpy of adsorption of CO2 on an environmentally friendly metal-organic framework, CD-MOF-2, has been determined directly for the first time using adsorption calorimetry at 25 degrees C. This calorimetric methodology provides a much more accurate and model-independent measurement of adsorption enthalpy than that obtained by calculation from the adsorption isotherms, especially for systems showing complex and strongly exothermic adsorption behavior. The differential enthalpy of CO2 adsorption shows enthalpy values in line with chemisorption behavior. At near-zero coverage, an irreversible binding event with an enthalpy of -113.5 kJ/mol CO2 is observed, which is followed by a reversible -65.4 kJ/mol binding event. These enthalpies are assigned to adsorption on more and less reactive hydroxyl groups, respectively. Further, a second plateau shows an enthalpy of -40.1 kJ/mol and is indicative of physisorbed CO2. The calorimetric data confirm the presence of at least two energetically distinct binding sites for chemisorbed CO2 on CD-MOF-2. (AU)

FAPESP's process: 11/02080-6 - CO2 adsorption on ZnO nanoparticles and the relationship with surface enthalpy and size stability
Grantee:Douglas Gouvêa
Support Opportunities: Scholarships abroad - Research