Production of hydrogen from methanol over binary Cu/ZnO catalysts

Agrell, Johan; Boutonnet, Magali; Fierro, J.L.G.

doi:10.1016/s0926-860x(03)00521-0

Cited by 116 publications

(56 citation statements)

References 34 publications

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“…At the same time formaldehyde and formic acid were detected. These secondary products are formed by dehydrogenation or partial oxidation of methanol in line with the results reported in literature [17][18][19].…”

Section: Influence Of Chemical Composition and Preparation Methods On supporting

confidence: 90%

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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Section: Influence Of Chemical Composition and Preparation Methods On supporting

confidence: 90%

Compact string reactor for autothermal hydrogen production

2007

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“…In the former, methanol reacts with substoichiometric amounts of oxygen (catalytic partial oxidation, CPO), in the latter total oxidation of methanol is combined with steamand/or CO 2 -reforming. CPO follows a complex mechanism: it has been proposed that different paths for methanol conversion, such as oxidation, steam-reforming, and decomposition may take place simultaneously [8][9][10][11][12][13][14][15]. Cu-ZnO and Pd are the most active catalysts for methanol CPO; different research groups have carried out detailed investigations on Cu-ZnO-based catalysts (see, for instance reference [7] and references therein) in which the activity and hydrogen selectivity are strictly related to Cu-Zn interactions.…”

Section: Introductionmentioning

confidence: 99%

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

et al. 2012

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A CoFe 2 O 4 inverse spinel calcined at two different temperatures (450°C and 750°C), in order to modulate the growth of the crystallites, has been employed in methanol anaerobic oxidation. A correlation between physico-chemical properties and catalytic performances of the material has been pursued. The study of both surface and bulk properties has been carried out by means of different experimental techniques, among which X-ray diffraction (XRD), transmission electron microscopy (TEM), and in situ FTIR spectroscopy. The FTIR study of both bulk and surface spectral features reveals that the calcination step is responsible for the different type of exposed surface sites, and as a consequence, for the different catalytic behaviour. As the use of the spinel as catalyst for methanol transformation into H 2 necessarily implies a regeneration step with steam, in order to recover the oxidative capacity of the solid, both surface and bulk features of the reoxidized solids have been also studied. All results reveal that the two samples, originally morphologically quite different from one another, become very similar after just one redox cycle. Still, it has been also demonstrated that both used materials irreversibly modify their surface properties after the reduction/oxidation process.

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“…The materials are thoroughly characterised and compared to a Cu/ZnO catalyst prepared using a conventional carbonate co-precipitation route. In the second part of the paper [32], the catalysts' activity for production of hydrogen from methanol by partial oxidation and steam reforming is evaluated and correlated to their physicochemical properties.…”

Section: Introductionmentioning

confidence: 99%