Autothermal Reforming of Methanol in an Isothermal Reactor - Concept and Realisation

Schuessler, M.; Lamla, Oskar; Stefanovski, Tomas; Klein, C. P. A. T.; Megede, Detlef zur

doi:10.1002/1521-4125(200111)24:11<1141::aid-ceat1141>3.0.co;2-8

Cited by 22 publications

(9 citation statements)

References 4 publications

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“…With the aim to produce hydrogen for fuel cell applications, when the MSR reaction is carried out in a traditional reactor (TR), the reformed hydrogen-rich stream needs purification before being fed to a polymer electrolyte membrane fuel cell (PEMFC). Scientific works on TRs mainly focus their attention on catalyst optimisation in order to reduce the CO content in the gaseous mixture coming out from the reformer [2][3][4][5][6][7]. In fact, the purification of a reformed stream is a crucial aspect and is mainly devoted to remove the CO, responsible with a content >10 ppm of the anodic catalyst poisoning of a PEMFC.…”

Section: Introductionmentioning

confidence: 68%

Methanol steam reforming in a dense Pd–Ag membrane reactor: The pressure and WHSV effects on CO-free H2 production

Iulianelli

Longo

Basile

2008

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 68%

Methanol steam reforming in a dense Pd–Ag membrane reactor: The pressure and WHSV effects on CO-free H2 production

Iulianelli

Longo

Basile

2008

Journal of Membrane Science

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“…The beneficial effect of improved heat transfer was demonstrated for the OSRM using either a conductive material [11], or channel micro-geometry of a monolith [12].…”

Section: Reactor Conceptmentioning

confidence: 99%

Compact string reactor for autothermal hydrogen production

2007

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This study addresses the development of a compact reactor for oxidative steam-reforming of methanol (OSRM) to produce hydrogen in autothermal mode for fuel cells. The string reactor uses catalytically active brass wires with a diameter of 500 mm placed in parallel into a tube. The micro-channels in the reactor for gases are formed between the wires presenting hydrodynamics similar to the one in multi-channel micro-reactors. Due to the high thermal conductivity of brass, the heat generated during methanol oxidation at the reactor entrance is transferred to the zone of the endothermic steam-reforming. The catalysts are prepared by Al-alloy formation on the surface of the brass wires followed by the partial leaching of Al. The catalyst presents a porous layer with the morphology of Raney metals and the chemical composition consistent with the Cu/Zn/Al-mixed oxide. The catalyst surface was additionally modified by incorporating chromium leading to Cr/Cu-spinel. This decreases the degree of the reduction of copper oxide and sintering leading to a stable catalyst. The catalyst was tested in OSRM showing high activity and selectivity to carbon dioxide and hydrogen. The string reactor presents nearly isothermal profile since the temperatures gradient within the reactor length is about 3 K. Micro-structured string reactor presents a short start-up and a fast transient behavior showing a rapid temperature change when adjusting the oxygen amount introduced into the reactor. #

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“…Metal based catalysts with high thermal conductivity can help to integrate the exothermic combustion of methanol and the endothermic steam-reforming. The beneficial effect of improved heat transfer was demonstrated for the OSRM using either a conductive material [13], or the micro geometry of a monolith [14].…”

Section: Reactor Conceptmentioning

confidence: 99%

Micro-structured string-reactor for autothermal production of hydrogen

Horny

Kiwi‐Minsker

Renken

2004

Chemical Engineering Journal

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Novel micro-structured string-reactor designed as catalytically active wires placed in parallel into a tube was developed. The small diameter of the channels (∼100 m) leads to a short radial diffusion time, a narrow residence time distribution (RTD), and a low pressure drop. This reactor was applied for the oxidative steam-reforming of methanol (OSRM) to produce hydrogen in autothermal mode for fuel cells. The heat generated during methanol oxidation at the reactor entrance is axially transferred to the reactor zone of the endothermic steam-reforming. The brass metal wires (Cu/Zn = 4/1) were used as precursors for the preparation of string-catalysts. The brass wires have high thermal conductivity (120 W/(m K)) and the chemical composition is similar to the active phase of the Cu/ZnO/Al 2 O 3 traditional catalyst during the steam-reforming of methanol. Brass-based string catalysts are obtained by metal/aluminium alloy formation on the outer surface of wires followed by an acid treatment leaching out aluminium. This treatment leads to an increase of the specific surface area (SSA) due to the formation of porous outer layer on the wire surface. The porous outer layer has the morphology of Raney metals. The catalysts were first tested for the steam-reforming of methanol and showed high activity together with selectivities close to 100% towards hydrogen and carbon dioxide. Then, the optimized catalyst was tested during the methanol partial oxidation (POX) and during OSRM. Oxygen was observed to be totally converted via total oxidation and therefore, higher methanol conversion in the OSRM together with CO 2 selectivity of 99% and H 2 selectivity of 60% were obtained.

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Autothermal Reforming of Methanol in an Isothermal Reactor - Concept and Realisation

Cited by 22 publications

References 4 publications

Methanol steam reforming in a dense Pd–Ag membrane reactor: The pressure and WHSV effects on CO-free H2 production

Methanol steam reforming in a dense Pd–Ag membrane reactor: The pressure and WHSV effects on CO-free H2 production

Compact string reactor for autothermal hydrogen production

Micro-structured string-reactor for autothermal production of hydrogen

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