Search results for: J. Herguido

Items from 1 to 20 out of 59 results

article

High purity hydrogen from coupled dry reforming and steam iron process with cobalt ferrites as oxygen carrier: Process improvement with the addition of NiAl2O4 catalyst

J. Lachén, P. Durán, J.A. Peña, J. Herguido

Catalysis Today > 2017 > 296 > C > 163-169

Cobalt ferrite with additive (alumina) has been proposed as oxygen carrier, to jointly carry out the dry reforming of a synthetic biogas, and the reduction stage of an oxide for producing hydrogen by “steam-iron” process. These reactions, as well as the associated reoxidation stage are performed within the same unit: a fixed bed reactor operating on a cyclic manner (redox) looking for the intensification...

article

Pure hydrogen from lighter fractions of bio-oil by steam-iron process: Effect of composition of bio-oil, temperature and number of cycles

J. Plou, J. Lachén, P. Durán, J. Herguido, more

Fuel > 2017 > 203 > C > 452-459

High purity hydrogen has been obtained by “steam-iron” process from lighter fractions of synthetic bio-oils of different compositions in a single fixed bed reactor operating cyclically. This process in closely related to chemical looping producing and purifying hydrogen in a single reactor. The feedstock consisted of a blend of four model compounds representing the lighter fractions of a bio-oil....

article

Advances and trends in two-zone fluidized-bed reactors

J Herguido, M Menéndez

Current Opinion in Chemical Engineering > 2017 > 17 > C > 15-21

Two-zone fluidized bed reactors, devices to carry on two reactions in a single reactor, have been widely studied in our group. This work summarizes the developments achieved after a previous review published in 2005 and shows how this technology can be applied in a wide variety of reactions. The advantages for each kind of process are discussed, as well as several proposals for improvement of the...

article

Dry reforming of biogas in fluidized bed: Process intensification

P. Ugarte, P. Durán, J. Lasobras, J. Soler, more

International Journal of Hydrogen Energy > 2017 > 42 > 19 > 13589- 13597

Biogas is a renewable resource obtained mainly from the anaerobic fermentation of agro-industrial and anthropogenic residues. The production of hydrogen by dry reforming of methane represents a potential application for this renewable energy carrier. This could play a positive contribution towards meeting the challenge of providing a global supply of energetically sustainable and environmentally friendly...

article

Iron oxide ores as carriers for the production of high purity hydrogen from biogas by steam–iron process

J. Lachén, J. Plou, P. Durán, J. Herguido, more

International Journal of Hydrogen Energy > 2017 > 42 > 19 > 13607- 13616

Production of high purity hydrogen (<50 ppm CO) by steam–iron process (SIP) from a synthetic sweetened biogas has been investigated making use of a natural iron ore containing up to 81 wt% of hematite (Fe₂O₃) as oxygen carrier. The presence of a lab-made catalyst (NiAl₂O₄ with NiO excess above its stoichiometric composition) was required to carry out the significant transformation of mixtures of...

article

Gas permeation effect on the Two-Section Two-Zone Fluidized Bed Membrane Reactor (TS-TZFBMR) fluid dynamics: A CFD simulation study

I. Julián, J. Herguido, M. Menéndez

Chemical Engineering Journal > 2016 > 305 > C > 201-211

Two-Fluid Model simulations were conducted using the commercial software Ansys CFX and Fluent to study the effect of the gas extraction on the fluid dynamic behavior of a membrane-assisted Two-Section Two-Zone Fluidized Bed Membrane Reactor (TS-TZFBMR). Simulated bubble properties and bed dynamics were analyzed and compared among different membrane reactor configurations, including reactor-wall (RWM)...

article

Behaviour of freeze-casting iron oxide for purifying hydrogen streams by steam-iron process

P. Durán, J. Lachén, J. Plou, R. Sepúlveda, more

International Journal of Hydrogen Energy > 2016 > 41 > 43 > 19518- 19524

Alternating reductions with hydrogen and oxidations with steam have been carried out on solids with improved redox capacity showing the benefits of different synthesis methods in the steam-iron process (SIP). Solids chosen were a commercial hematite, a lab-made iron oxide doped with ceria and alumina and hematite synthesized by freeze-casting technique. The first one shows a high loss of reactivity...

article

Hydrogen from bio-fuels by “steam-iron” process: Modelling and kinetics

J. Plou, P. Durán, J. Herguido, J.A. Peña

International Journal of Hydrogen Energy > 2016 > 41 > 42 > 19349- 19356

Steam-iron process, directly related to chemical looping, can produce high purity hydrogen from liquid bio-fuels in a single vessel taking advantage of its reductive behaviour. It comprises two steps: reduction of an iron oxide with additives with aid of the fuel, and oxidation of the previously produced metallic iron by steam producing PEMFC quality hydrogen. Since it takes place in the same reactor,...

article

Experimental and simulated solids mixing and bubbling behavior in a scaled two-section two-zone fluidized bed reactor

I. Julián, J. Herguido, M. Menéndez

Chemical Engineering Science > 2016 > 143 > C > 240-255

Digital Image Analysis techniques, a phenomenological Counter-Current Back-Mixing model (CCBM) and Two-Fluid Model (TFM) simulations were employed to evaluate the effect of scale on the Two-Section Two-Zone Fluidized Bed Reactors (TS-TZFBR) fluid dynamics, i.e. bubble characteristics, axial mixing of solids and defluidization phenomena. The reactor scaling did not affect the quality of the TFM bubble...

article

Hydrodynamic study of a Two-Section Two-Zone Fluidized Bed Reactor with an immersed tube bank via PIV/DIA

I. Julián, F. Gallucci, M. van Sint Annaland, J. Herguido, more

Chemical Engineering Science > 2015 > 134 > Complete > 238-250

The hydrodynamic behaviour of a pseudo-2D Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR) with an immersed tube bundle in its lower zone has been studied using non-invasive Particle Image Velocimetry (PIV) and Digital Image Analysis (DIA). Coupled porosity distribution maps from DIA post-processing and solids velocity vector fields from PIV analysis allowed the reconstruction of the transient...

article

Hydrogen from synthetic biogas via SIP using NiAl2O4 catalyst: Reduction stage

M. Herrer, J. Plou, P. Durán, J. Herguido, more

International Journal of Hydrogen Energy > 2015 > 40 > 15 > 5244-5250

A mechanical mixture of doped iron oxide and non-stoichiometric nickel aluminate (NiO in excess over stoichiometric NiAl₂O₄) acting as catalyst, was tested for producing purified hydrogen by methane dry reforming reaction (MDR) in combination with steam-iron process (SIP). For such purpose a mixture of CH₄ and CO₂ was used simulating as sweetened biogas as reducing raw material. Both processes were...

article

Hydrogen from synthetic biogas by catalyzed MDR and SIP: Screening of catalyst and iron oxide mixtures

J. Plou, P. Durán, J. Herguido, J.A. Peña

Fuel > 2015 > 140 > C > 470-476

Hydrogen production plus purification has been studied by the joint use of methane dry reforming (MDR) and the reduction–oxidation of iron oxides (Steam-Iron Process or SIP) within the same reactor. The raw material studied has been an equimolar mixture of CH₄ and CO₂ simulating the composition of a biogas exempt of any other contaminant. The study has been mainly carried out by thermogravimetry,...

article

Experimental assessment of hydrogen separation from H2/CH4 mixtures by the “steam-iron process” in an interconnected circulating fluidized bed reactor

J. Herguido, J.A. Peña, E. Carazo

International Journal of Hydrogen Energy > 2014 > 39 > 26 > 14050- 14060

An experimental study devoted to the continuous separation of hydrogen from its mixtures with methane in continuous regime is presented. The study was carried out in a single-vessel reactor divided into two interconnected adjoining chambers, operating as fluidized beds and with a continuous flow of solids between them. The process is based on iron oxide being selectively reduced or oxidized, depending...

article

CFD model prediction of the Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR) hydrodynamics

I. Julián, J. Herguido, M. Menéndez

Chemical Engineering Journal > 2014 > 248 > Complete > 352-362

Computational simulations and experiments have been carried out to study the bed hydrodynamics in a Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR). An Eulerian–Eulerian two-fluid approach has been used to simulate the reactor bubbling behavior, while cold fluidization measurements have been made in pseudo-2D TS-TZFBR facilities. The characteristic bubble shrinkage within the transition bed...

article

A non-parametric bubble size correlation for a Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR)

I. Julián, J. Herguido, M. Menéndez

Powder Technology > 2014 > 256 > Complete > 146-157

The Two-Zone Fluidized Bed Reactor (TZFBR) provides a high level of process integration, allowing heterogeneous catalytic reaction and simultaneous catalyst regeneration in two different zones of a single fluidized bed. This work considers a new reactor design that incorporates a different cross-sectional area in each zone to allow low flow rates in the regeneration zone. The reactor geometry, e.g...

article

Hydrogen from ethanol by steam iron process in fixed bed reactor

E. Hormilleja, P. Durán, J. Plou, J. Herguido, more

International Journal of Hydrogen Energy > 2014 > 39 > 10 > 5267-5273

This research is devoted to the use of ethanol (i.e. bio-ethanol) in the combined production and purification of hydrogen by redox processes. The process has been studied in a single lab scale fixed bed reactor. Iron oxides, apart from their remarked redox behavior, exert an important catalytic role allowing the complete decomposition of ethanol at temperatures in the range from 625 to 750 °C. The...

article

Purified hydrogen from synthetic biogas by joint methane dry reforming and steam-iron process: Behaviour of metallic oxides and coke formation

J. Plou, P. Durán, J. Herguido, J.A. Peña

Fuel > 2014 > 118 > Complete > 100-106

Mechanical mixtures of nickel oxide and iron oxide doped with small quantities of ceria and alumina (2wt%), have been tested as suitable solids to jointly produce and purify hydrogen from an equimolar mixture of CH ₄ and CO ₂ simulating a desulfurized biogas. Since the solid mixture constitutes a reactant within the system, most part of the experiments has been carried out in a thermogravimetric...

article

Stable hydrogen production by methane steam reforming in a two zone fluidized bed reactor: Experimental assessment

L. Pérez-Moreno, J. Soler, J. Herguido, M. Menéndez

Journal of Power Sources > 2013 > 243 > C > 233-241

The Two Zone Fluidized Bed Reactor concept is proposed for hydrogen production via the steam reforming of methane (SRM) including integrated catalyst regeneration. In order to study the effect of the contact mode, the oxidative SRM has been carried out over a Ni/Al₂O₃ catalyst using a fixed bed reactor (fBR), a conventional fluidized-bed reactor (FBR) and the proposed two-zone fluidized bed reactor...

article

Combined production and purification of hydrogen from methanol using steam iron process in fixed bed reactor

R. Campo, P. Durán, J. Plou, J. Herguido, more

Journal of Power Sources > 2013 > 242 > Complete > 520-526

A research work is being conducted to study the combined production and purification of hydrogen by means of redox processes departing from biomass fast pyrolysis oils (bio-oils). To achieve that goal, methanol has been used as featured material because it is the most representative compound of the alcoholic fraction of bio-oils. The study has been carried out in a fixed bed reactor where methanol...

article

Stable hydrogen production by methane steam reforming in a two-zone fluidized-bed reactor: Effect of the operating variables

L. Pérez-Moreno, J. Soler, J. Herguido, M. Menéndez

International Journal of Hydrogen Energy > 2013 > 38 > 19 > 7830-7838

The oxidative steam reforming of methane in a two-zone fluidized-bed reactor (TZFBR) was investigated over a Ni/Al ₂ O ₃ catalyst. The effects of the main operating variables (temperature, steam/oxygen ratio, steam/methane ratio and relative velocity with respect to the minimum fluidization velocity) have been studied. A comparison has been made with results given in the literature...

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Search results for: J. Herguido

High purity hydrogen from coupled dry reforming and steam iron process with cobalt ferrites as oxygen carrier: Process improvement with the addition of NiAl2O4 catalyst

Pure hydrogen from lighter fractions of bio-oil by steam-iron process: Effect of composition of bio-oil, temperature and number of cycles

Advances and trends in two-zone fluidized-bed reactors

Dry reforming of biogas in fluidized bed: Process intensification

Iron oxide ores as carriers for the production of high purity hydrogen from biogas by steam–iron process

Gas permeation effect on the Two-Section Two-Zone Fluidized Bed Membrane Reactor (TS-TZFBMR) fluid dynamics: A CFD simulation study

Behaviour of freeze-casting iron oxide for purifying hydrogen streams by steam-iron process

Hydrogen from bio-fuels by “steam-iron” process: Modelling and kinetics

Experimental and simulated solids mixing and bubbling behavior in a scaled two-section two-zone fluidized bed reactor

Hydrodynamic study of a Two-Section Two-Zone Fluidized Bed Reactor with an immersed tube bank via PIV/DIA

Hydrogen from synthetic biogas via SIP using NiAl2O4 catalyst: Reduction stage

Hydrogen from synthetic biogas by catalyzed MDR and SIP: Screening of catalyst and iron oxide mixtures

Experimental assessment of hydrogen separation from H2/CH4 mixtures by the “steam-iron process” in an interconnected circulating fluidized bed reactor

CFD model prediction of the Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR) hydrodynamics

A non-parametric bubble size correlation for a Two-Section Two-Zone Fluidized Bed Reactor (TS-TZFBR)

Hydrogen from ethanol by steam iron process in fixed bed reactor

Purified hydrogen from synthetic biogas by joint methane dry reforming and steam-iron process: Behaviour of metallic oxides and coke formation

Stable hydrogen production by methane steam reforming in a two zone fluidized bed reactor: Experimental assessment

Combined production and purification of hydrogen from methanol using steam iron process in fixed bed reactor

Stable hydrogen production by methane steam reforming in a two-zone fluidized-bed reactor: Effect of the operating variables

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