Inhibition effect of CO on hydrogen permeability of Pd–Ag membrane applied in a microchannel module configuration

Kurokawa, Hiromi; Yakabe, H.; Yasuda, Isamu; Peters, Thijs; Bredesen, Rune

doi:10.1016/j.ijhydene.2014.08.056

Cited by 49 publications

(25 citation statements)

References 41 publications

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“…It is well documented that the apparent permeance in hydrogen mixtures with inerts or under reaction conditions may be much smaller than the one measured by pure H 2 feed . This is due to two sources: concentration polarization and surface effects .…”

Section: Mathematical Model Derivationmentioning

confidence: 99%

“…Here we use the expression and values suggested by Israni and Harold, Eq. , to account on coadsorption effects calibrated with their measurements on Pd–Ag membrane for components relevant to methanol SR. CO is considered to be the most inhibitive out of the various co‐adsorbents . Even such a comparison may be erroneous since the Pd–Ag may catalyze a reaction that blocks the surface …”

Section: Mathematical Model Derivationmentioning

confidence: 99%

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Multi‐fuel scaled‐down autothermal pure H₂ generator: Design and proof of concept

Patrascu

Sheintuch

2016

AIChE Journal

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This article presents experimental results of an autothermal scaled‐down system for H2 production. Pure atmospheric pressure H2, separated in situ by Pd–Ag membranes, is produced by steam reforming (SR) of methane, ethanol, or glycerol. Oxidizing the SR effluents in a separate compartment supplies the heat. The oxidation feed is axially distributed to avoid hotspots. The 1.3 L system, comprises 100 cm2 of membrane area, and generates H2 flow rate equivalent to 0.15 kW at an efficiency of ∼25%. This process leads to comparable performance when different fuels are used. A mathematical model, validated by the measurements, predicts that increasing the membrane area relative to the outer surface area will substantially increase the efficiency and power output. This design serves as proof of concept for on‐board pure H2 generators, with flexible fuel sources, and holds a great promise to reduce the need for special H2 transport and storage technologies for portable or stationary applications. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2112–2125, 2016

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Section: Mathematical Model Derivationmentioning

confidence: 99%

Section: Mathematical Model Derivationmentioning

confidence: 99%

Multi‐fuel scaled‐down autothermal pure H₂ generator: Design and proof of concept

Patrascu

Sheintuch

2016

AIChE Journal

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“…The combustion of hydrogen produces only water vapour with a limited pollution to the environmental impact when produced thorugh renewable sources [2]. Hydrogen is currently widely used in several industries such as petroleum, steel, space, chemical and petrochemical industries but is expected to be increasingly more relevant in transportation and power generation sectors [2] [4] [5]. Everyday, membrane reactors play an important role in shifting the quilibrium during water-gas shift reaction for conversion of CO to hydrogen through the steam methane reforming (SMR) process.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen permeation through palladium membranes can be decribed through the process below [5] [6] [7]:…”

Section: Introductionmentioning

confidence: 99%

A Comparison of the Inhibiting Effect of CO and CO2 to Hydrogen Permeation and n-Value in Pd and Pd/Ag Membranes Prepared on Alumina Support

Alkali¹,

Abdullahi²

2019

JPEE

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The mitigation of the CO inhibition effect in palladium membranes is necessary due to its significance in the efficiency of membrane reactors and hydrogen production systems. In this work, the hydrogen separation performance of a Pd and Pd/Ag membrane both of thickness 2 μm is investigated using a mixed gas with composition (H 2 = 50%, CO = 28%, CO 2 = 10%, CH 4 = 8%, N 2 = 4%) at temperature 623 -873 K and pressure (0.05 -0.4 bar) was investigated. The component gases CO and CO 2 were observed to inhibit hydrogen permeation through the membrane and lead to deviations from Sievert's law for n values 0.55 and 0.62 for the Pd membrane and unity for the Pd/Ag membrane.For the Pd/Ag membrane, the concentration of CO in the permeate stream was reduced as a result of the addition of Ag. The effect of the component gases to hydrogen permeation was observed to be lower for the Pd/Ag membrane. Annealing the membrane in hydrogen at high temperature decreased the inhibition effect and enhanced hydrogen permeation through the membrane.

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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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Inhibition effect of CO on hydrogen permeability of Pd–Ag membrane applied in a microchannel module configuration

Cited by 49 publications

References 41 publications

Multi‐fuel scaled‐down autothermal pure H₂ generator: Design and proof of concept

Multi‐fuel scaled‐down autothermal pure H₂ generator: Design and proof of concept

A Comparison of the Inhibiting Effect of CO and CO2 to Hydrogen Permeation and n-Value in Pd and Pd/Ag Membranes Prepared on Alumina Support

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

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Inhibition effect of CO on hydrogen permeability of Pd–Ag membrane applied in a microchannel module configuration

Cited by 49 publications

References 41 publications

Multi‐fuel scaled‐down autothermal pure H2 generator: Design and proof of concept

Multi‐fuel scaled‐down autothermal pure H2 generator: Design and proof of concept

A Comparison of the Inhibiting Effect of CO and CO2 to Hydrogen Permeation and n-Value in Pd and Pd/Ag Membranes Prepared on Alumina Support

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

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Product

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Multi‐fuel scaled‐down autothermal pure H₂ generator: Design and proof of concept

Multi‐fuel scaled‐down autothermal pure H₂ generator: Design and proof of concept