Gas Permeation Testing Results from the Mixed Waste Focus Area Improved Hydrogen Getter Program

Stone, Mark C.; Orme, Christopher J.; Peterson, Eric S.; Benson, Michael; Kaszuba, John P.; Mroz, E. J.; Haga, Marc J.

doi:10.1081/ss-200042486

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…5−9 If not properly eliminated, the increasing hydrogen concentration may initiate hydriding corrosion, embrittlement of materials, and degradation of electronic components and/or surpass the safety limit and induce a hazardous explosion. 10,11 Hydrogen getters have also been used in the transportation of transuranic waste. 12−14 With large capacities and rapid and irreversible hydrogen uptake rates, acetylenic compounds are one of the most efficient types of hydrogen getters.…”

Section: ■ Introductionmentioning

confidence: 99%

Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate

Sangalang

Sharma

Saw

et al. 2019

ACS Appl. Mater. Interfaces

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The hydrogen uptake kinetics of 1,4-bis(phenylethynyl)benzene, or DEB, mixed with palladium (Pd) on activated carbon in a rubber matrix coating on top of a porous silicone foam substrate are investigated. First, isothermal isobaric hydrogenation experiments were performed under different temperatures and H2 pressures to extract the uptake kinetics. The H2 uptake models based on the measured kinetic parameters were then employed to investigate/simulate the performance of the getter under dynamic application environments. The actual hydrogenation characteristics in this type of getter are multifaceted and involve actual H2 concentration in the getter matrix, micrometer-scale diffusion of atomic hydrogen away from Pd sites, precipitation of hydrogenated DEB crystals at the coating surfaces, and mobility of fresh DEB molecules. The kinetic analysis/modeling methodology described in this report can serve as a template for other gas–solid reactions as well. Besides possessing a good hydrogen capacity and excellent performance, this type of rubberized getter also offers some unique advantages over traditional solid getter: flexible structure and protection of the Pd catalyst from exposure to the environment.

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Section: ■ Introductionmentioning

confidence: 99%

Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene (DEB) Rubberized Coating on Silicone Foam Substrate

Sangalang

Sharma

Saw

et al. 2019

ACS Appl. Mater. Interfaces

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“…However, impurities like CO and a few chlorinated compounds (like carbon tetrachloride, tricholoroethylene, tricholoroethane, choloroform, and methylene chloride) did appear to inhibit or reduce the hydrogen uptake capability. 2 A better understanding of the action of impurities is clearly necessary in order to prevent the loss of H-uptake effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Mixed Aromatic−Alkyne System on a Pd Surface: A First-Principles Study

et al. 2005

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Chemistry of mixed aromatic-alkyne systems on a metal surface is of general interest in many industrial processes. We use Density Functional Theory (DFT) to investigate the chemistry of one such system, i.e., 1,4-diphenyl-butadiyne, or DPB, in contact with Pd (110) and (111) surfaces. Reaction pathways and energetics of important processes are explored, including H 2 adsorption, dissociation and migration on the metal surface, DPBmetal interaction, the energetics of H uptake, and the effects of impurities like CO and CO 2 on H chemistry. We find that: (i) strong aromatic-metal interaction leads to significant binding strength of DPB molecule to both Pd surfaces, especially the (110); (ii) H 2 molecule readily dissociates on the Pd surface into H-radicals, which get taken up by alkyne triple bonds; (iii) CO has strong binding to the metal surface, but interacts weakly with H radicals; (iv) CO 2 binds weakly to the metal surface, but could potentially lead to interesting chemical reactions with H.

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“…can potentially lead to explosive situations. As a preventive measure, scavenger molecules are designed to gather and store hydrogen in a variety of environments [1,2]. Two of the most successful hydrogen scavengers so far have been 1,4-bis (phenylethynyl) benzene (DEB) and 1,4-diphenyl-butadiyne (DPB) [3].…”

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confidence: 99%