Methanol steam reforming in single-fiber packed bed Pd–Ag membrane reactor: Experiments and modeling

Steam reforming of methanol over Cu/ZnO/Al2O3 catalyst was theoretically studied under created unsteady state. A mathematical approach was proposed to evaluate the effect of periodic inputs on reactor performance. The efficacy of the periodic separating reactor in term of pure hydrogen and of methanol conversion was measured during the reaction of methanol steam reforming. The obtained results showed that under certain operating conditions the periodic operation can be used advantageously to increase the reactor ability up to a level higher than the maximal steady-state. Moreover, our findings showed that the pumping of hydrogen through the membrane was stimulated by the effect of periodic operations. The predicted results suggested that the created unsteady state mode by using a square wave function could give the better performances compared to the sinusoidal mode. Copyright © 2018 BCREC Group. All rights reservedReceived: 15th July 2017; Revised: 26th November 2017; Accepted: 8th December 2017; Available online: 11st June 2018; Published regularly: 1st August 2018How to Cite: Chibane, L. (2018). Simulation Study of a Membrane Reactor for Ultrapure Hydrogen Recovery from Methanol Steam Reforming Reaction under Periodic Steady-State. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (2): 275-285 (doi:10.9767/bcrec.13.2.1340.275-285)

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Methanol steam reforming: A comparison of different kinetics in the simulation of a packed bed reactor

Chemical Engineering Journal ◽

10.1016/j.cej.2009.06.007 ◽

2009 ◽

Vol 154 (1-3) ◽

pp. 69-75 ◽

Cited By ~ 22

Author(s):

R. Tesser ◽

M. Di Serio ◽

E. Santacesaria

Keyword(s):

Steam Reforming ◽

Packed Bed ◽

Packed Bed Reactor ◽

Methanol Steam Reforming

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Recent advances in membrane reactors for hydrogen production by steam reforming of ethanol as a renewable resource

Reviews in Chemical Engineering ◽

10.1515/revce-2017-0083 ◽

2019 ◽

Vol 35 (3) ◽

pp. 377-392 ◽

Cited By ~ 6

Author(s):

Majid Taghizadeh ◽

Fatemeh Aghili

Keyword(s):

Noble Metal ◽

Steam Reforming ◽

Membrane Reactor ◽

Renewable Resource ◽

Packed Bed ◽

Membrane Reactors ◽

Hydrogen Yield ◽

Recent Advances ◽

Steam Reforming Of Ethanol ◽

The Impact

AbstractDuring the last decade, hydrogen has attracted lots of interest due to its potential as an energy carrier. Ethanol is one of the renewable resources that can be considered as a sustainable candidate for hydrogen generation. In this regard, producing hydrogen from ethanol steam reforming (ESR) would be an environmentally friendly process. Commonly, ESR is performed in packed bed reactors; however, this process needs several stages for hydrogen separation with desired purity. Recently, the concept of a membrane reactor, an attractive device integrating catalytic reactions and separation processes in a single unit, has allowed obtaining a smaller reactor volume, higher conversion degrees, and higher hydrogen yield in comparison to conventional reactors. This paper deals with recent advances in ESR in terms of catalyst utilization and the fundamental of membranes. The main part of this paper discusses the performance of different membrane reactor configurations, mainly packed bed membrane reactors, fluidized bed membrane reactors, and micro-membrane reactors. In addition, a short overview is given about the impact of ESR via different catalysts such as noble metal, non-noble metal, and bi-metallic catalysts.

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Modeling and Design of a Multi-Tubular Packed-Bed Reactor for Methanol Steam Reforming over a Cu/ZnO/Al2O3 Catalyst

Energies ◽

10.3390/en13030610 ◽

2020 ◽

Vol 13 (3) ◽

pp. 610 ◽

Cited By ~ 3

Author(s):

Jimin Zhu ◽

Samuel Simon Araya ◽

Xiaoti Cui ◽

Simon Lennart Sahlin ◽

Søren Knudsen Kær

Keyword(s):

Steam Reforming ◽

Packed Bed ◽

Methanol Conversion ◽

Operating Conditions ◽

Packed Bed Reactor ◽

Inlet Temperature ◽

Methanol Steam Reforming ◽

Shell Side ◽

Co Concentration ◽

The Impact

Methanol as a hydrogen carrier can be reformed with steam over Cu/ZnO/Al2O3 catalysts. In this paper a comprehensive pseudo-homogenous model of a multi-tubular packed-bed reformer has been developed to investigate the impact of operating conditions and geometric parameters on its performance. A kinetic Langmuir-Hinshelwood model of the methanol steam reforming process was proposed. In addition to the kinetic model, the pressure drop and the mass and heat transfer phenomena along the reactor were taken into account. This model was verified by a dynamic model in the platform of ASPEN. The diffusion effect inside catalyst particles was also estimated and accounted for by the effectiveness factor. The simulation results showed axial temperature profiles in both tube and shell side with different operating conditions. Moreover, the lower flow rate of liquid fuel and higher inlet temperature of thermal air led to a lower concentration of residual methanol, but also a higher concentration of generated CO from the reformer exit. The choices of operating conditions were limited to ensure a tolerable concentration of methanol and CO in H2-rich gas for feeding into a high temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stack. With fixed catalyst load, the increase of tube number and decrease of tube diameter improved the methanol conversion, but also increased the CO concentration in reformed gas. In addition, increasing the number of baffle plates in the shell side increased the methanol conversion and the CO concentration.

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