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Restrictions on the rate of absorption when evaluating sorption isotherms obtained using a micro-calorimetric technique

Johannesson, Björn LU (2001) In Journal of Building Physics 25(2). p.85-100
Abstract
One interestingway of measuring sorption isotherms and heats of sorption is the newly developed micro-calorimetric method. It turns out, however, that the adsorption kinetics must be proven to be rapid enough to fulfill the assumptions behind the theory for the determination of the isotherm to be valid. Here, the lower limit of the accepted rate of adsorption will be analyzed by making calculations of the diffusion behavior in the calorimetric vessel. The evaluation of the adsorption isotherms is based on assumptions of a quasi-static nature. If the adsorption kinetics are slow the behavior in the calorimeter will turn to a more or less transient process. When the heat of adsorption is of interest and the sorption isotherm and kinetics of... (More)
One interestingway of measuring sorption isotherms and heats of sorption is the newly developed micro-calorimetric method. It turns out, however, that the adsorption kinetics must be proven to be rapid enough to fulfill the assumptions behind the theory for the determination of the isotherm to be valid. Here, the lower limit of the accepted rate of adsorption will be analyzed by making calculations of the diffusion behavior in the calorimetric vessel. The evaluation of the adsorption isotherms is based on assumptions of a quasi-static nature. If the adsorption kinetics are slow the behavior in the calorimeter will turn to a more or less transient process. When the heat of adsorption is of interest and the sorption isotherm and kinetics of sorption can be determined by other methods, compensation for the transient effects can be made. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Building Physics
volume
25
issue
2
pages
85 - 100
publisher
SAGE Publications Inc.
external identifiers
  • scopus:0035492335
ISSN
1744-2583
DOI
10.1106/KA2X-NAWR-PQWD-V4V0
language
English
LU publication?
yes
id
3b6f1452-6c10-43c9-bf9d-435b80488935 (old id 1529111)
date added to LUP
2010-01-18 08:50:03
date last changed
2018-01-07 09:57:25
@article{3b6f1452-6c10-43c9-bf9d-435b80488935,
  abstract     = {One interestingway of measuring sorption isotherms and heats of sorption is the newly developed micro-calorimetric method. It turns out, however, that the adsorption kinetics must be proven to be rapid enough to fulfill the assumptions behind the theory for the determination of the isotherm to be valid. Here, the lower limit of the accepted rate of adsorption will be analyzed by making calculations of the diffusion behavior in the calorimetric vessel. The evaluation of the adsorption isotherms is based on assumptions of a quasi-static nature. If the adsorption kinetics are slow the behavior in the calorimeter will turn to a more or less transient process. When the heat of adsorption is of interest and the sorption isotherm and kinetics of sorption can be determined by other methods, compensation for the transient effects can be made.},
  author       = {Johannesson, Björn},
  issn         = {1744-2583},
  language     = {eng},
  number       = {2},
  pages        = {85--100},
  publisher    = {SAGE Publications Inc.},
  series       = {Journal of Building Physics},
  title        = {Restrictions on the rate of absorption when evaluating sorption isotherms obtained using a micro-calorimetric technique},
  url          = {http://dx.doi.org/10.1106/KA2X-NAWR-PQWD-V4V0},
  volume       = {25},
  year         = {2001},
}