Carbon surface polarity from immersion calorimetry

A series of carbons with various oxygen- and/or nitrogen-containing surface groups has been prepared and analyzed by water vapor adsorption, acid–base titration, immersion calorimetry, and XPS. These techniques led to coherent description of the surfaces and of their chemistry. It has been found tha...

Full description

Saved in:
Bibliographic Details
Published inFuel processing technology Vol. 79; no. 3; pp. 217 - 223
Main Authors Szymański, Grzegorz S, Biniak, Stanisław, Rychlicki, Gerhard
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.12.2002
Elsevier Science
Subjects
Activated carbon
Applied sciences
Coal and derived products
Energy
Exact sciences and technology
Fuels
Immersion enthalpy
Structure, chemical and physical properties
Surface modification functional groups
Surface modification functional groups
Activated carbon
Immersion enthalpy
Gas solid adsorption
Enthalpy
Calorimetry
Polarity
Photoelectron spectrometry
Surface analysis
Carbon
Online AccessGet full text

Cover

More Information
Summary:A series of carbons with various oxygen- and/or nitrogen-containing surface groups has been prepared and analyzed by water vapor adsorption, acid–base titration, immersion calorimetry, and XPS. These techniques led to coherent description of the surfaces and of their chemistry. It has been found that the total concentration of surface oxygen and nitrogen correlates with the acid–base properties. At the same time, a simple correlation exists between the enthalpy of immersion into water for such modified activated carbons and specific interactions with the solid. These interactions correspond to the acidic (with oxygen) and basic (without oxygen or with nitrogen) sites. The value of water interaction with the carbon surface is ca. 21 kJ mol −1 of surface species.
ISSN:0378-3820
1873-7188
DOI:10.1016/S0378-3820(02)00178-9