Kinetics of water vapor adsorption on single-layer molecular sieve 3A: Experiments and modeling

Ronghong Lin, Jiuxu Liu, Yue Nan, David W. Depaoli, Lawrence L. Tavlarides

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

The objective of the current work was to shorten the gap for fundamental adsorption kinetic data required for the development of advanced adsorption unit-operation models to be incorporated into an overall plant-level model for spent nuclear fuel reprocessing. The kinetics of water-vapor adsorption on molecular sieve 3A was investigated at 25-80 °C and water dew points from -69 to 17 °C. Water uptake curves were fitted with three kinetic models including the linear-driving-force model, the shrinking-core model, and the Langmuir kinetic model. The results suggest that the water-vapor adsorption on molecular sieve 3A under the investigated experimental conditions was controlled by both external film resistance and internal macropore resistance. The contribution of the external film resistance varied from 25% to 50% of the total mass-transfer resistance depending on the adsorption temperature. It was also found that the Langmuir kinetic model fitted individual sets of kinetic data very well, but the Langmuir adsorption constant obtained from curve fitting decreased with increasing adsorption temperature and with increasing water vapor pressure. This result indicates a significant surface heterogeneity of molecular sieve 3A and also implicitly verifies that the Langmuir isotherm model is unable to represent isotherms of water adsorption on molecular sieve 3A.

Original languageEnglish (US)
Pages (from-to)16015-16024
Number of pages10
JournalIndustrial and Engineering Chemistry Research
Volume53
Issue number41
DOIs
StatePublished - Oct 15 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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