Adsorption Equilibrium and Modeling of Water Vapor on Reduced and Unreduced Silver-Exchanged Mordenite

Nan, Yue; Lin, Ronghong; Liu, Jiuxu; Crowl, Tyler B.; Ladshaw, Austin; Yiacoumi, Sotira; Tsouris, Costas; Tavlarides, Lawrence L.

doi:10.1021/acs.iecr.7b01180

Title: Adsorption Equilibrium and Modeling of Water Vapor on Reduced and Unreduced Silver-Exchanged Mordenite

Journal Article · Mon Jun 26 00:00:00 UTC 2017 · Industrial and Engineering Chemistry Research

DOI: https://doi.org/10.1021/acs.iecr.7b01180 · OSTI ID:1399935

^[1]; Lin, Ronghong ^[1]; Liu, Jiuxu ^[1]; Crowl, Tyler B. ^[1];

^[2]; Yiacoumi, Sotira ^[2]; Tsouris, Costas ^[3];

^[1]

Syracuse Univ., NY (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Georgia Inst. of Technology, Atlanta, GA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This work is related to the removal of tritiated water and radioactive iodine from off-gases released during spent nuclear fuel reprocessing. Specifically, it is focused on the adsorption equilibrium of water on reduced silver mordenite (Ag⁰Z), which is the state-of-art solid adsorbent for iodine retention in the off-gas treatment. As the off-gases contain different gas species, including iodine and water, Ag⁰Z would take up iodine and water simultaneously during the adsorption process. Therefore, understanding the adsorption of water on Ag⁰Z is important and necessary for studying the performance of Ag⁰Z in off-gas treatment processes. The isotherms of water (nonradioactive water) on Ag⁰Z were obtained at temperatures of 25, 40, 60, 100, 150, and 200 °C with a continuous-flow adsorption system. The data were analyzed using the Heterogeneous Langmuir and generalized statistical thermodynamic adsorption (GSTA) models, and thermodynamic parameters of the isotherms were obtained from both models. Both models were found capable of describing the isotherms. Isotherms of water on the unreduced silver mordenite (AgZ) were also obtained at 25, 40, and 60 °C and parametrized by the GSTA model. Through the comparison of the isotherms of Ag⁰Z and AgZ, it was found that Ag⁰Z had a higher water adsorption capacity than AgZ. The comparison of their thermodynamic parameters suggested that the interaction of water molecules with the H⁺ in Ag⁰Z was stronger than that with the Ag⁺ in AgZ.

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

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1399935

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 28 Vol. 56; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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