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Title: Methyl iodide sorption by reduced silver mordenite

Abstract

At the Pacific Northwest Laboratory (PNL), we performed two sets of experiments to determine the effects of pertinent operational parameters and gas compositions on organic radioiodine (in particular methyl iodide (CH/sub 3/I)) capture by silver mordenite (AgZ). In the first set of experiments, we studied the effects of (1) hydrogen pretreatment of AgZ, (2) change in particle size of AgZ, and (3) the presence of water in the gas phase. In the second set of experiments we evaluated on a semi-quantitative basis the effects of nitric oxide (NO), nitrogen dioxide (NO/sub 2/), superficial face velocity, and temperature on CH/sub 3/I capture by reduced (hydrogen pretreated) silver mordenite (Ag/sup 0/Z). These studies have shown that AgZ, especially Ag/sup 0/Z, is an effective trap for CH/sub 3/I. However, its effectiveness varies with changes in operational parameters and is affected by other gases found in the process off gas of a nuclear reprocessing plant. Optimum trappig efficiency was achieved with Ag/sup 0/Z rather than AgZ, 20-40 mesh Ag/sup 0/Z rather than 0.16 cm extrudate, moisture in the gas stream, higher temperatures up to 200/sup 0/C, absence of NO, and lower superficial face velocities down to 3.75 m/min. Additionally, CH/sub 3/I can be convertedmore » to elemental iodine (I/sub 2/) in the presence of NO or NO/sub 2/ by controlling the operational parameters. Since I/sub 2/ is easier to trap than organic iodides, this should improve trapping efficiency,.« less

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (USA)
OSTI Identifier:
6017408
Report Number(s):
PNL-4489
ON: DE83014936; TRN: 83-018828
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; METHYL IODIDE; ADSORPTION; MORDENITE; SORPTIVE PROPERTIES; EXPERIMENTAL DATA; IODINE 129; NITRIC OXIDE; NITROGEN DIOXIDE; TEMPERATURE EFFECTS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHALCOGENIDES; DATA; HALOGENATED ALIPHATIC HYDROCARBONS; INFORMATION; INORGANIC ION EXCHANGERS; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; IODINATED ALIPHATIC HYDROCARBONS; IODINE ISOTOPES; ION EXCHANGE MATERIALS; ISOTOPES; MATERIALS; MINERALS; NITROGEN COMPOUNDS; NITROGEN OXIDES; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC IODINE COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RADIOISOTOPES; SILICATE MINERALS; SORPTION; SURFACE PROPERTIES; YEARS LIVING RADIOISOTOPES; ZEOLITES; 052001* - Nuclear Fuels- Waste Processing

Citation Formats

Scheele, R D, Burger, L L, and Matsuzaki, C L. Methyl iodide sorption by reduced silver mordenite. United States: N. p., 1983. Web. doi:10.2172/6017408.
Scheele, R D, Burger, L L, & Matsuzaki, C L. Methyl iodide sorption by reduced silver mordenite. United States. doi:10.2172/6017408.
Scheele, R D, Burger, L L, and Matsuzaki, C L. Wed . "Methyl iodide sorption by reduced silver mordenite". United States. doi:10.2172/6017408. https://www.osti.gov/servlets/purl/6017408.
@article{osti_6017408,
title = {Methyl iodide sorption by reduced silver mordenite},
author = {Scheele, R D and Burger, L L and Matsuzaki, C L},
abstractNote = {At the Pacific Northwest Laboratory (PNL), we performed two sets of experiments to determine the effects of pertinent operational parameters and gas compositions on organic radioiodine (in particular methyl iodide (CH/sub 3/I)) capture by silver mordenite (AgZ). In the first set of experiments, we studied the effects of (1) hydrogen pretreatment of AgZ, (2) change in particle size of AgZ, and (3) the presence of water in the gas phase. In the second set of experiments we evaluated on a semi-quantitative basis the effects of nitric oxide (NO), nitrogen dioxide (NO/sub 2/), superficial face velocity, and temperature on CH/sub 3/I capture by reduced (hydrogen pretreated) silver mordenite (Ag/sup 0/Z). These studies have shown that AgZ, especially Ag/sup 0/Z, is an effective trap for CH/sub 3/I. However, its effectiveness varies with changes in operational parameters and is affected by other gases found in the process off gas of a nuclear reprocessing plant. Optimum trappig efficiency was achieved with Ag/sup 0/Z rather than AgZ, 20-40 mesh Ag/sup 0/Z rather than 0.16 cm extrudate, moisture in the gas stream, higher temperatures up to 200/sup 0/C, absence of NO, and lower superficial face velocities down to 3.75 m/min. Additionally, CH/sub 3/I can be converted to elemental iodine (I/sub 2/) in the presence of NO or NO/sub 2/ by controlling the operational parameters. Since I/sub 2/ is easier to trap than organic iodides, this should improve trapping efficiency,.},
doi = {10.2172/6017408},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {6}
}