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Hydrogen Gas Separation From Hydrogen/Natural Gas Mixtures by High Temperature Proton Exchange Membrane Electrochemical Hydrogen Pump.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Hydrogen Gas Separation From Hydrogen/Natural Gas Mixtures by High Temperature Proton Exchange Membrane Electrochemical Hydrogen Pump./
Author:	Stansberry, John Michael.
Description:	1 online resource (255 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
Contained By:	Dissertations Abstracts International85-11B.
Subject:	Mechanical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798382745992

Hydrogen Gas Separation From Hydrogen/Natural Gas Mixtures by High Temperature Proton Exchange Membrane Electrochemical Hydrogen Pump.
Stansberry, John Michael.

Hydrogen Gas Separation From Hydrogen/Natural Gas Mixtures by High Temperature Proton Exchange Membrane Electrochemical Hydrogen Pump. - 1 online resource (255 pages)

Source: Dissertations Abstracts International, Volume: 85-11, Section: B.

Thesis (Ph.D.)--University of California, Irvine, 2024.

Includes bibliographical references

The proliferation of variable renewable energy resources that generate electrical power from solar and wind is a critical step in achieving a climate neutral and sustainable energy system. The successful implementation of these electrical power generators is limited due to the uncontrollable nature of their availability to produce electrical power. One method by which to shift this energy production temporally and spatially to the time and place of its demand is the production of hydrogen as a chemical energy carrier. However, this approach would require large-scale infrastructure investments to produce, store, and transport hydrogen gas.One proposed strategy for the storage and transport of hydrogen is to blend with natural gas and inject it into pre-existing natural gas infrastructure. Hydrogen gas blended into natural gas in this way can contribute to the decarbonization of the natural gas system, however it is not as valuable in terms of its economic and carbon reduction potential. This value could be recovered if the separation of high-purity hydrogen gas from a blended gas system is done in an efficient manner.Electrochemical hydrogen separation is a well-established technology for efficient hydrogen separation, which can be accomplished by electrochemical hydrogen pump (EHP) based on a proton conducting membrane (PEM). The EHP works to separate hydrogen by facilitating the electrochemical process of oxidation of hydrogen at an anode and subsequent evolution of hydrogen gas at a cathode, while other gaseous impurities are ideally unable to permeate through the membrane. The goal of this work is to investigate the potential of electrochemical separation as a highly efficient means of separating trace volumetric quantities of hydrogen gas from natural gas by using high-temperature proton exchange membrane (HT-PEM).To investigate the efficacy of this approach, a high temperature proton exchange membrane electrochemical hydrogen pump (HT-PEM EHP) based on phosphoric acid doped polybenzimidazole (PA-PBI) PEM is tested in hydrogen/methane gaseous blends while also testing the impacts of varying phosphoric acid contents in the membrane electrode assembly. Operando X-ray CT testing of the PA-PBI HT-PEM EHP is implemented to investigate the structure of the cell during pump operation under varying acid content and humidification. A two-dimensional cell model of the PBI-PA based HT-PEM EHP is developed and validated with cell testing data as well as with data from X-ray CT measurements. The emphasis of the model is on the electrochemical performance of the cell under mass transport limiting conditions and the influence of varying acid contents in the MEA.HT-PEM EHP based on a quaternary ammonium biphosphate anion ion-pair coordinated with polyphenylene (PA-QAPOH) membrane were investigated experimentally to determine their stability and performance in EHP configuration. The presence of phosphanated polypentafluorostyrene (PWN) and Nafion® ionomeric binders in the electrodes of the ion-pair EHP was found to be critical to the stability of the ion-pair EHP. Ion-pair EHP performance was characterized with respect to cell temperature and relative humidity, and the separation of high purity H2 gas from pipeline natural gas and H2 blends was demonstrated. The suitability of alternative sulfonic acid ionomers in the ion-pair HT-PEM EHP was measured and compared to state of the art HT-PEM EHP based on sol-gel PBI-PA membrane for low concentration hydrogen gas concentration blends in methane and in natural gas.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798382745992Subjects--Topical Terms:

557493
Mechanical engineering.
Subjects--Index Terms:

Electrochemical hydrogen pumpIndex Terms--Genre/Form:

554714
Electronic books.

Hydrogen Gas Separation From Hydrogen/Natural Gas Mixtures by High Temperature Proton Exchange Membrane Electrochemical Hydrogen Pump.
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520 $a The proliferation of variable renewable energy resources that generate electrical power from solar and wind is a critical step in achieving a climate neutral and sustainable energy system. The successful implementation of these electrical power generators is limited due to the uncontrollable nature of their availability to produce electrical power. One method by which to shift this energy production temporally and spatially to the time and place of its demand is the production of hydrogen as a chemical energy carrier. However, this approach would require large-scale infrastructure investments to produce, store, and transport hydrogen gas.One proposed strategy for the storage and transport of hydrogen is to blend with natural gas and inject it into pre-existing natural gas infrastructure. Hydrogen gas blended into natural gas in this way can contribute to the decarbonization of the natural gas system, however it is not as valuable in terms of its economic and carbon reduction potential. This value could be recovered if the separation of high-purity hydrogen gas from a blended gas system is done in an efficient manner.Electrochemical hydrogen separation is a well-established technology for efficient hydrogen separation, which can be accomplished by electrochemical hydrogen pump (EHP) based on a proton conducting membrane (PEM). The EHP works to separate hydrogen by facilitating the electrochemical process of oxidation of hydrogen at an anode and subsequent evolution of hydrogen gas at a cathode, while other gaseous impurities are ideally unable to permeate through the membrane. The goal of this work is to investigate the potential of electrochemical separation as a highly efficient means of separating trace volumetric quantities of hydrogen gas from natural gas by using high-temperature proton exchange membrane (HT-PEM).To investigate the efficacy of this approach, a high temperature proton exchange membrane electrochemical hydrogen pump (HT-PEM EHP) based on phosphoric acid doped polybenzimidazole (PA-PBI) PEM is tested in hydrogen/methane gaseous blends while also testing the impacts of varying phosphoric acid contents in the membrane electrode assembly. Operando X-ray CT testing of the PA-PBI HT-PEM EHP is implemented to investigate the structure of the cell during pump operation under varying acid content and humidification. A two-dimensional cell model of the PBI-PA based HT-PEM EHP is developed and validated with cell testing data as well as with data from X-ray CT measurements. The emphasis of the model is on the electrochemical performance of the cell under mass transport limiting conditions and the influence of varying acid contents in the MEA.HT-PEM EHP based on a quaternary ammonium biphosphate anion ion-pair coordinated with polyphenylene (PA-QAPOH) membrane were investigated experimentally to determine their stability and performance in EHP configuration. The presence of phosphanated polypentafluorostyrene (PWN) and Nafion® ionomeric binders in the electrodes of the ion-pair EHP was found to be critical to the stability of the ion-pair EHP. Ion-pair EHP performance was characterized with respect to cell temperature and relative humidity, and the separation of high purity H2 gas from pipeline natural gas and H2 blends was demonstrated. The suitability of alternative sulfonic acid ionomers in the ion-pair HT-PEM EHP was measured and compared to state of the art HT-PEM EHP based on sol-gel PBI-PA membrane for low concentration hydrogen gas concentration blends in methane and in natural gas.
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