Adsorption of iodine on hydrogen-reduced silver-exchanged mordenite: Experiments and modeling

Nan, Yue; Tavlarides, Lawrence L.; DePaoli, David W.

doi:10.1002/aic.15432

Title: Adsorption of iodine on hydrogen-reduced silver-exchanged mordenite: Experiments and modeling

Journal Article · 03 August 2016 · AIChE Journal

DOI: https://doi.org/10.1002/aic.15432 · OSTI ID:1324201

Nan, Yue ^[1]; Tavlarides, Lawrence L. ^[1]; DePaoli, David W. ^[2]

Syracuse Univ., Syracuse, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The adsorption process of iodine, a major volatile radionuclide in the off-gas streams of spent nuclear fuel reprocessing, on hydrogen-reduced silver-exchanged mordenite (Ag⁰Z) was studied at the micro-scale. The gas-solid mass transfer and reaction involved in the adsorption process were investigated and evaluated with appropriate models. Optimal conditions for reducing the silver-exchanged mordenite (AgZ) in a hydrogen stream were determined. Kinetic and equilibrium data of iodine adsorption on Ag⁰Z were obtained by performing single-layer adsorption experiments with experimental systems of high precision at 373–473 K over various iodine concentrations. Results indicate approximately 91% to 97% of the iodine adsorption was through the silver-iodine reaction. The effect of temperature on the iodine loading capacity of Ag⁰Z was discussed. In conclusion, the Shrinking Core model describes the data well, and the primary rate controlling mechanisms were macro-pore diffusion and silver-iodine reaction. © 2016 American Institute of Chemical Engineers AIChE J, 2016

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Work for Others (WFO); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324201

Journal Information:: AIChE Journal, Journal Name: AIChE Journal; ISSN 0001-1541

Publisher:: American Institute of Chemical EngineersCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 64 works

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