Enthalpy of adsorption for hydrocarbons on concrete by inverse gas chromatography

被引:11
|
作者
Widegren, Jason A. [1 ]
Bruno, Thomas J. [1 ]
机构
[1] NIST, Thermophys Properties Div, Boulder, CO 80305 USA
关键词
Construction concrete; Enthalpy of adsorption; Specific retention volume; Heat of adsorption; Hydrocarbon; Inverse gas chromatography; SOLID CHROMATOGRAPHY; CEMENT PASTES; CLAY; COMPONENTS; HEATS;
D O I
10.1016/j.chroma.2011.04.075
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Enthalpies of adsorption, Delta H(a), are reported for several light hydrocarbons on normal construction concrete. Delta H(a), which are a measure of the adhesion strength of a molecule on a surface, were determined by gas-solid chromatography with a packed column containing 60-80 mesh concrete particles. With this approach, the specific retention volume for a compound is measured as a function of temperature, and these data are used to calculate Delta H(a). For the hydrocarbons studied, we found that Delta H(a) was relatively large for unsaturated hydrocarbons. These are the first determinations of Delta H(a) of hydrocarbons on construction concrete, but useful comparisons with other ionic solids such as clays can be made. Published by Elsevier B.V.
引用
收藏
页码:4474 / 4477
页数:4
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