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Title: Milestone Report - M4FT-15OR0312026 - Complete NO and NO 2 aging of AgZ

Abstract

In an off-gas system within a nuclear fuel reprocessing plant, any capture material will be exposed to a gas stream for months at a time. This gas stream may be at elevated temperature and could contain water, NO x gas, or a variety of other constituents that comprise the off-gas stream. For this reason, it is important to understand the effects of long-term exposure, or aging, on proposed capture materials. One material under consideration is silver-exchanged mordenite (AgZ). The aim of this study was to determine the effect of extended exposure at 150°C to an air stream containing NO on the iodine capture capacity of the hydrogen reduced form of AgZ designated as Ag 0Z. The study was originally also intended to expand on the static NO 2 aging studies by exposing Ag 0Z to a flowing stream of NO 2 for an extended period of time, but those tests were delayed due to NO 2 production schedules by the gas vendor. Unreduced silver mordenite has a loading capacity of approximately 25 mg I/g AgZ and that capacity is increased to 100 mg I/g Ag 0Z upon reduction. It appears that extended exposure of AgZ to 1% NO at 150°Cmore » may not only neutralize the increased capacity gained by reduction, but perhaps degrade the sorbent even further. Loss of 80% of sorbent capacity and surface area was observed after 8 weeks of exposure to a 1% NO stream at 150°C. Investigations continue into the effects of aging by off-gas components on iodine sorbents. Future work will age silver mordenite with streams containing NO 2. As the simulated off-gas streams become more complex and more corrosive, the ability of AgZ to withstand conditions present in off-gas streams will be more fully known.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1210142
Report Number(s):
ORNL/SPR-2015/128
AF5805010; NEAF327
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
silver mordenite; aging; NO; iodine

Citation Formats

Bruffey, Stephanie H., Patton, Kaara K., Walker, Jr, Joseph Franklin, and Jubin, Robert Thomas. Milestone Report - M4FT-15OR0312026 - Complete NO and NO2 aging of AgZ. United States: N. p., 2015. Web. doi:10.2172/1210142.
Bruffey, Stephanie H., Patton, Kaara K., Walker, Jr, Joseph Franklin, & Jubin, Robert Thomas. Milestone Report - M4FT-15OR0312026 - Complete NO and NO2 aging of AgZ. United States. doi:10.2172/1210142.
Bruffey, Stephanie H., Patton, Kaara K., Walker, Jr, Joseph Franklin, and Jubin, Robert Thomas. Tue . "Milestone Report - M4FT-15OR0312026 - Complete NO and NO2 aging of AgZ". United States. doi:10.2172/1210142. https://www.osti.gov/servlets/purl/1210142.
@article{osti_1210142,
title = {Milestone Report - M4FT-15OR0312026 - Complete NO and NO2 aging of AgZ},
author = {Bruffey, Stephanie H. and Patton, Kaara K. and Walker, Jr, Joseph Franklin and Jubin, Robert Thomas},
abstractNote = {In an off-gas system within a nuclear fuel reprocessing plant, any capture material will be exposed to a gas stream for months at a time. This gas stream may be at elevated temperature and could contain water, NOx gas, or a variety of other constituents that comprise the off-gas stream. For this reason, it is important to understand the effects of long-term exposure, or aging, on proposed capture materials. One material under consideration is silver-exchanged mordenite (AgZ). The aim of this study was to determine the effect of extended exposure at 150°C to an air stream containing NO on the iodine capture capacity of the hydrogen reduced form of AgZ designated as Ag0Z. The study was originally also intended to expand on the static NO2 aging studies by exposing Ag0Z to a flowing stream of NO2 for an extended period of time, but those tests were delayed due to NO2 production schedules by the gas vendor. Unreduced silver mordenite has a loading capacity of approximately 25 mg I/g AgZ and that capacity is increased to 100 mg I/g Ag0Z upon reduction. It appears that extended exposure of AgZ to 1% NO at 150°C may not only neutralize the increased capacity gained by reduction, but perhaps degrade the sorbent even further. Loss of 80% of sorbent capacity and surface area was observed after 8 weeks of exposure to a 1% NO stream at 150°C. Investigations continue into the effects of aging by off-gas components on iodine sorbents. Future work will age silver mordenite with streams containing NO2. As the simulated off-gas streams become more complex and more corrosive, the ability of AgZ to withstand conditions present in off-gas streams will be more fully known.},
doi = {10.2172/1210142},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {3}
}

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