Textural Characterization and Energetics of Porous Solids by Adsorption Calorimetry

Vanessa Silenia Garcia-Cuello, Liliana Giraldo and Juan C. Moreno-Pirajan
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Vanessa Silenia Garcia-Cuello: Department of Chemistry, Faculty of Science, National University of Colombia, Bogota, Colombia
Liliana Giraldo: Department of Chemistry, Faculty of Science, National University of Colombia, Bogota, Colombia
Juan C. Moreno-Pirajan: Research Group on Porous Solids and Calorimetry, Department of Chemistry, Faculty of Science, University of the Andes, Bogota, Colombia

Energies, 2011, vol. 4, issue 6, 1-20

Abstract: An adsorption microcalorimeter was designed and built in our laboratory and used for the determination of differential adsorption heats in different samples of porous solids: activated carbon granules, activated carbon pellets, an activated carbon monolith and a zeolite sample. This work shows the relationship between adsorption heat and the pore size of different porous solids using adsorption of NH 3 , CO and N 2 O. The result shows that the thermal effect can be related with textural properties and superficial chemical groups of the studied porous solids. The values of differential heats of N 2 O adsorption in the investigated systems have shown that this interaction is weaker than that with CO. Small amounts of N 2 O are chemisorbed in the investigated systems. For the room temperature adsorption of N 2 O, the strongest active sites for the interaction with Brönsted acid groups in the ACM structure were identified. The values determined are between ?60 kJ/mol and ?110 kJ/mol for ZMOR and ACM, respectively, for the adsorption of N 2 O and ?95 kJ/mol and ?130 kJ/mol for the adsorption of CO.

Keywords: adsorption microcalorimeter; differential heat; adsorption; isotherm; porous solids (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2011
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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