Effect of the presence of light hydrocarbon mixtures on hydrogen permeance through Pd–Ag alloyed membranes

Montesinos, Hector; Julián, Ignacio; Herguido, J.; Menéndez, M.

doi:10.1016/j.ijhydene.2014.11.054

Cited by 35 publications

(15 citation statements)

References 39 publications

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“…Figures a and a indicate that increasing the H 2 partial pressure difference decreases the permeance. Similar behavior has been observed in other studies . This might be attributed to more hydrogen ions in the lattice at high pressure difference that makes the movement of the ions relatively difficult, thereby reducing the permeance.…”

Section: Resultssupporting

confidence: 87%

Permeation characteristics of hydrogen through palladium membranes in binary and ternary gas mixtures

Chen

Lin

Hsun

et al. 2017

Int. J. Energy Res.

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Summary The permeances of two palladium (Pd) membranes in pure H2, binary and ternary gas mixtures are investigated experimentally. With 10% of gas impurities (N2, CO2, or CO) in H2, the profiles of dimensionless permeance suggest that H2 permeation rate is lessened by approximately 50% to 90%, and the permeance reduced by the gas impurities is ranked as CO > CO2 > N2. By introducing a parameter of permeance resistance, which is the reciprocal of permeance, the permeance resistance in a ternary gas mixture can be predicted from the summation of individual permeance resistances in binary gas mixtures, revealing no synergistic effect exhibited from the interaction of contaminants. At least 75% and up to 100% of H2 in the gas mixtures can be recovered in the membrane system, and the maximum H2 recovery develops at the H2 partial pressure difference of 2 or 3 atm. In the Arrhenius‐type equation describing the relationship between the permeance and temperature, the activation energy is between approximately 2 and 18 kJ mole−1. In general, the permeances of the membranes in gas mixtures, especially in ternary gas mixtures, are more sensitive to temperature when compared with those in pure H2, stemming from lower activation energy exhibited. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 87%

Permeation characteristics of hydrogen through palladium membranes in binary and ternary gas mixtures

Chen

Lin

Hsun

et al. 2017

Int. J. Energy Res.

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“…TZFBR+MB configuration has been tested in our laboratory [20][21][22][23]. Different processes of catalytic alkane dehydrogenation have been tested in TZFBR+MB reactors using several types of membrane, such as palladium membranes over ceramic hollow fiber or commercial membranes over a porous metallic support.…”

Section: Introductionmentioning

confidence: 99%

Pure hydrogen from biogas: Intensified methane dry reforming in a two-zone fluidized bed reactor using permselective membranes

Durán

Sanz-Martínez

Soler

et al. 2019

Chemical Engineering Journal

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Methane dry reforming of biogas can be a sustainable source of hydrogen but the development of this technology is hindered by limitations such as endothermicity and catalyst deactivation by coke. A two zone fluidized bed reactor coupling permselective Pd/Ag membranes counteracts them and allows to intensify the process obtaining a stable pure hydrogen production. Here we report the effect of operation variables (i.e., temperature, total bed height, nature and partial pressure of regenerative agent, relative height of the regeneration and reaction zones, and use of an activation period) on the yield to hydrogen and stability of the process. Hydrogen over-yields, compared with the conventional fluidized bed reactor, in the range of +200% to +100% were obtained for the entire interval of temperatures 475-575°C whilst maintaining stable operation by continuous catalyst regeneration. Around 70% of it was pure hydrogen coming from the permeate side of the membranes. The proposed reactor configuration greatly increases both methane conversion and selectivity to hydrogen (expressed as H 2 /CO ratio), not only in relation to our own conventional reactor findings but also regarding other published results.

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“…One of the most critical materials in the SMR process is the Pd membrane [7], which is used to generate hydrogen at low temperatures and greatly increase the conversion of the original gas [8]. However, the hydrogen permeation rate of Pd membrane was greatly affected in the effects on impurities as oil, sulfides and arsenides [9,10]. Especially, it showed the maximum fragility and sensibility in sulfides even if these sulfides were extremely low in content [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen Sulfide and Redox Reactions on the Surface Properties and Hydrogen Permeability of Pd Membranes

et al. 2018

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Although hydrogen sulfide (H 2 S) was always a negative factor leading to the reduction of hydrogen permeability of palladium (Pd) membranes, its proper application could result in a positive effect. In this study, pure Pd membranes were firstly reacted with H 2 S at 23-450 • C, and then treated by redox reactions. Afterwards, the hydrogen permeability was tested under different reaction conditions using a hydrogen penetrant testing device. Moreover, both products and morphology changes occurred on the Pd membrane surface were analyzed using XRD, XPS and SEM. The results showed that H 2 S was dissociated to produce sulfides at 23 • C. With a rise of temperature, a regular change took place in the reaction products, morphology of the Pd membrane surface and hydrogen permeability. Adsorbed impurities such as sulfides and free carbon on the Pd membrane surface were removed by the redox treatment. The hydrogen permeability was improved by about 80% for the Pd membrane material subjected to the treatment method stated the above against the untreated one.

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Effect of the presence of light hydrocarbon mixtures on hydrogen permeance through Pd–Ag alloyed membranes

Cited by 35 publications

References 39 publications

Permeation characteristics of hydrogen through palladium membranes in binary and ternary gas mixtures

Permeation characteristics of hydrogen through palladium membranes in binary and ternary gas mixtures

Pure hydrogen from biogas: Intensified methane dry reforming in a two-zone fluidized bed reactor using permselective membranes

Influence of Hydrogen Sulfide and Redox Reactions on the Surface Properties and Hydrogen Permeability of Pd Membranes

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