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Title: Evaluation of getters for methane and ammonia decomposition

Abstract

Getters are used in many tritium purification systems for impurity removal. One getter material, SAES® ST909, can be used to decompose various impurities (methane, carbon oxides, ammonia and others), and release the hydrogen bound in these compounds for further processing. Because, ST909 absorbs eight to nine percent of its initial weight in nitrogen, alternate materials may provide greater operational flexibility to accommodate variable operating carrier gases. The gettering capability of ST909 is related to the tri-metallic alloy (zirconium, manganese, and iron) composition. However, simply using a material with the same composition may not provide similar methane and ammonia decomposition conversion efficiency. For this testing, alternative materials to ST909 are compared to track methane and ammonia decomposition performance. Bench scale tests were performed at elevated temperature using various gas mixtures. Changes in methane and ammonia decomposition performance were tracked using RGA analysis during bench scale testing. Analytical comparisons of chemically equivalent materials to ST909 were also performed and correlated to bench scale test results. Characterization testing performed to evaluate chemically equivalent materials included: X-ray fluorescence, X-ray diffraction, and inductively coupled plasma-mass spectrometry (ICP-MS). Results are expounded upon and differences in gettering capability of alternate materials are highlighted.

Authors:
ORCiD logo [1];  [1]
  1. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)
Publication Date:
Research Org.:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1487371
Report Number(s):
[SRNL-STI-2017-00258]
[Journal ID: ISSN 0920-3796; PII: S0920379618304496]
Grant/Contract Number:  
[AC09-08SR22470]
Resource Type:
Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
[ Journal Volume: 133; Journal Issue: C]; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

James, David W., and Morgan, Gregg A. Evaluation of getters for methane and ammonia decomposition. United States: N. p., 2018. Web. doi:10.1016/j.fusengdes.2018.05.022.
James, David W., & Morgan, Gregg A. Evaluation of getters for methane and ammonia decomposition. United States. doi:10.1016/j.fusengdes.2018.05.022.
James, David W., and Morgan, Gregg A. Mon . "Evaluation of getters for methane and ammonia decomposition". United States. doi:10.1016/j.fusengdes.2018.05.022. https://www.osti.gov/servlets/purl/1487371.
@article{osti_1487371,
title = {Evaluation of getters for methane and ammonia decomposition},
author = {James, David W. and Morgan, Gregg A.},
abstractNote = {Getters are used in many tritium purification systems for impurity removal. One getter material, SAES® ST909, can be used to decompose various impurities (methane, carbon oxides, ammonia and others), and release the hydrogen bound in these compounds for further processing. Because, ST909 absorbs eight to nine percent of its initial weight in nitrogen, alternate materials may provide greater operational flexibility to accommodate variable operating carrier gases. The gettering capability of ST909 is related to the tri-metallic alloy (zirconium, manganese, and iron) composition. However, simply using a material with the same composition may not provide similar methane and ammonia decomposition conversion efficiency. For this testing, alternative materials to ST909 are compared to track methane and ammonia decomposition performance. Bench scale tests were performed at elevated temperature using various gas mixtures. Changes in methane and ammonia decomposition performance were tracked using RGA analysis during bench scale testing. Analytical comparisons of chemically equivalent materials to ST909 were also performed and correlated to bench scale test results. Characterization testing performed to evaluate chemically equivalent materials included: X-ray fluorescence, X-ray diffraction, and inductively coupled plasma-mass spectrometry (ICP-MS). Results are expounded upon and differences in gettering capability of alternate materials are highlighted.},
doi = {10.1016/j.fusengdes.2018.05.022},
journal = {Fusion Engineering and Design},
number = [C],
volume = [133],
place = {United States},
year = {2018},
month = {5}
}

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