Semi-Empirical Material Model for Hydrogen Uptake Kinetics by 1,4-bis(phenylethynyl)benzene (DEB)-based Getters

Safarik, D. J.; Aloi, Michael; Nobile, A.

doi:10.2172/1673346

Cited by 1 publication

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“…However, these triple-bonded organic hydrogen getters require the presence of a catalyst (in this case, palladium) to break molecular hydrogen down to atomic hydrogen, which can then react with the triple bonds. One well-studied example of this class of getters is 1,4-bis(phenylethynyl)benzene, abbreviated DEB. − DEB readily reacts with atomic hydrogen and safely traps the hydrogen in the solid material, thus preventing reaction with other components or overpressure from accumulation in a closed space.…”

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confidence: 99%

Hydrogen Uptake Kinetics of 1,4-Bis(phenylethynyl)benzene Rubberized O-Rings: Measurements, Modeling, and Comparison with Additional Forms of Organic Getters

et al. 2022

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A class of molecules called “hydrogen getters” can react with, or scavenge, H2 in applications where the hydrogen presence and/or buildup are not desirable. One such “getter”, 1,4-bis(phenylethynyl)benzene or DEB, can be incorporated into a silicone matrix in the form of an O-ring for added flexibility, environmental resiliency, and convenient use as a gasket in sealed applications. However, the performance and kinetics of this DEB-loaded rubberized O-ring have not yet been characterized. In this work, the hydrogen uptake kinetics of the rubberized DEB O-ring were extracted by the isoconversional analysis from isothermal isobaric data under conditions of 13,332 Pa H2 and 305–325 K. The isoconversional and cylindrical diffusion approximations were then used to predict and model the hydrogen uptake of rubberized DEB O-rings under any arbitrary condition, as illustrated in this work for the simple case of a constant rate of hydrogen generation/input. In comparison with other Pd/carbon-based/organic getter systems, these rubberized DEB O-rings provide a type of hydrogen getter material with enhanced flexibility and catalyst protection in applications where an O-ring seal is needed.

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