Pure hydrogen production in a membrane reformer: Demonstration, macro-scale and atomic scale modeling

Sheintuch, Moshe

doi:10.1016/j.cej.2014.11.100

Cited by 14 publications

(13 citation statements)

References 31 publications

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“…Order of magnitude estimates of the former show small effect for the dimensions in Fig. 1 and the assumed permeance [25].…”

Section: Transport Propertiesmentioning

confidence: 88%

“…This system is intended to be used for on board scaled down applications, and the small characteristic (radial) lengths should prevent significant gradients. The issue of concentration polarization in a separator and in a membrane reactor was addressed recently by our group [25,27], and approximate corrections were derived. The former problem is usually relevant for polarization in the permeate stream, but since we have not employed sweep stream, it is not relevant to our work.…”

Section: Optimizationmentioning

confidence: 99%

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Design concepts of a scaled-down autothermal membrane reformer for on board hydrogen production

Patrascu

Sheintuch

2015

Chemical Engineering Journal

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“…Order of magnitude estimates of the former show small effect for the dimensions in Fig. 1 and the assumed permeance [25].…”

Section: Transport Propertiesmentioning

confidence: 88%

Section: Optimizationmentioning

confidence: 99%

Design concepts of a scaled-down autothermal membrane reformer for on board hydrogen production

Patrascu

Sheintuch

2015

Chemical Engineering Journal

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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 . Still, very little work has been done on comparing reactor run results with simulation results based on pure hydrogen measured permeance.…”

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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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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“…The performance characteristics of the MRCR for H 2 production was studied using computational fluid dynamic (CFD) modeling in the present work. The use of CFD techniques in modeling packed bed reformer, [16][17][18] with hydrogen membrane, [19][20][21] for both laboratory and industrial application has been widely reported. CFD studies have also been used to understand combustion dynamics in industrial furnaces.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

Sanusi

Mokheimer

2018

Int J Energy Res

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Summary Hydrogen is mostly produced in conventional steam methane reforming plants. In this work, we proposed a membrane‐based reformer‐combustor reactor (MRCR) for hydrogen generation in order to improve heat recovery and overall thermal efficiency. The proposed configuration will also reduce the complexity in existing steam methane reforming (SMR) plants. The proposed MRCR comprises combustion zone, hydrogen permeate zone, and SMR zone. A computational fluid dynamics model was developed using ANSYS‐Fluent software to simulate and analyze the performance of the proposed MRCR. Results show that high hydrogen yields were observed at high reformer pressures (RPs) and low gas hourly space velocities (GHSVs). Furthermore, by increasing the steam to methane ratio and addition of excess air in the combustion side, the hydrogen yield from the MRCR decreases. This is attributed to the reduction in the effective temperature of the hydrogen membrane. High RP, low GHSV, and low steam to methane ratio that increased the hydrogen yield also decreased carbon monoxide (CO) emissions. For an increased RP from 1 to 10 bar, the CO emission decreased by about 99%. The reduction in CO emission at high RP would be attributed to the effect of water gas shift reaction in the MRCR. Results of the extensive parametric study presented in this work can be used to determine the operating conditions based on tradeoffs between hydrogen yield (mole H2/mole CH4), hydrogen production rate (kg of H2/h), allowable CO emissions, and exhaust gas temperature for other applications such as gas turbine.

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Pure hydrogen production in a membrane reformer: Demonstration, macro-scale and atomic scale modeling

Cited by 14 publications

References 31 publications

Design concepts of a scaled-down autothermal membrane reformer for on board hydrogen production

Design concepts of a scaled-down autothermal membrane reformer for on board hydrogen production

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

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

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Pure hydrogen production in a membrane reformer: Demonstration, macro-scale and atomic scale modeling

Cited by 14 publications

References 31 publications

Design concepts of a scaled-down autothermal membrane reformer for on board hydrogen production

Design concepts of a scaled-down autothermal membrane reformer for on board hydrogen production

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

Performance analysis of a membrane‐based reformer‐combustor reactor for hydrogen generation

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Product

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