Silver-Mordenite for Radiologic Gas Capture from Complex Streams: Dual Catalytic CH3I Decomposition and I Confinement

Nenoff, Tina M.; Rodriguez, Mark; Soelberg, Nick; Chapman, Karena W.

doi:10.1016/j.micromeso.2014.04.041

Silver-Mordenite for Radiologic Gas Capture from Complex Streams: Dual Catalytic CH3I Decomposition and I Confinement

Journal Article · Mon Dec 01 04:00:00 EST 2014 · Microporous and Mesoporous Materials

DOI:https://doi.org/10.1016/j.micromeso.2014.04.041· OSTI ID:1162208

Nenoff, Tina M.; Rodriguez, Mark; Soelberg, Nick; Chapman, Karena W.

The effective capture and storage of radiological iodine (129I) remains a strong concern for safe nuclear waste storage and safe nuclear energy. Silver-containing mordenite (MOR) is a longstanding benchmark for iodine capture. In nuclear fuel reprocessing scenarios, complex gas streams will be present and the need for high selectivity of all iodine containing compounds is of the utmost importance for safety and the environment. In particular, a molecular level understanding of the sorption of organic iodine compounds is not well understood. Here we probe the structure and distribution of methyl iodide sorbed by silver-containing MOR using a combination of crystallographic and materials characterization techniques including: infrared spectroscopy, thermogravimetric analysis with mass spectrometry, Micro-X-ray Fluorescence, powder X-ray diffraction analysis, and pair distribution function analysis. The iodine is captured inside the MOR pore in the form of AgI nanoparticles, that is consistent with the pores sizes of the MOR, indicating that the molecule is both physically and chemically captured in the Ag-MOR. The organic component is surface catalyzed by the zeolite via the formation of Surface Methoxy Species (SMS) that result in downstream organics of dimethyl ether and methanol formation.

Research Organization:: Idaho National Laboratory (INL)

Sponsoring Organization:: DOE - NE

DOE Contract Number:: AC07-05ID14517

OSTI ID:: 1162208

Report Number(s):: INL/JOU-14-31276

Journal Information:: Microporous and Mesoporous Materials, Journal Name: Microporous and Mesoporous Materials Vol. 200; ISSN 1387-1811

Country of Publication:: United States

Language:: English

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