Bio-ethanol steam reforming: Insights on the mechanism for hydrogen production

Benito, Manuel; Sanz, J.; Isabel, Rosa; Padilla, R.; Arjona, R.; Daza, L.

doi:10.1016/j.jpowsour.2005.02.046

Cited by 185 publications

(84 citation statements)

References 20 publications

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“…Besides, two acetaldehyde molecules can react with each other to form acetone through aldol condensation reaction [35] or be oxidized to acetic acid [110]. Carbon can be formed at various stages from carbon-containing species via either cracking or Boudouard reaction [111]. Ethanol adsorption and subsequent surface reaction have been extensively studied over many different catalyst systems employing FTIR technique.…”

Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 99%

“…The relaxed bulk structure of CeO 2 with a lattice parameter of 5.46 Å was used to construct the slab model. The CeO 2 (111) and Co/CeO 2 (111) surfaces were modeled as 2  1 super cells. A three molecular CeO 2 thick slab model was constructed, thus nine atomic layers in total.…”

Section: Computational Approachesmentioning

confidence: 99%

“…After numerical differentiation, each transition state was confirmed to have a single imaginary vibrational frequency. Ethanol decomposition via steam reforming reaction was computationally studied on the CeO 2 (111) and Co/CeO 2 (111) surfaces. From our results, the most likely reaction pathway is described below.…”

Section: Computational Approachesmentioning

confidence: 99%

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Catalytic Hydrogen Production from Bioethanol

Song¹

2012

Bioethanol

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Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 99%

Section: Computational Approachesmentioning

confidence: 99%

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Catalytic Hydrogen Production from Bioethanol

Song¹

2012

Bioethanol

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“…The main reaction mechanisms involve dehydration or dehydrogenation reactions [17]. Dehydration reactions produce intermediate products such as ethylene, which is easily transformed into carbon that is deposited on the active phase producing the catalyst poisoning [18].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by the Steam Reforming of Bio-Ethanol over Nickel-Based Catalysts for Fuel Cell Applications

Chen¹,

Xu²

2017

IJSGE

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Abstract:The bio-ethanol steam reforming over nickel-based catalysts when the temperature is within the range of 700 to 800 K is studied for fuel cell applications. The effect of operating conditions such as the temperature, space time, water-to-ethanol molar ratio, and oxygen-to-ethanol molar ratio on the product distribution is evaluated. The water-gas shift reaction is examined in the reforming process. Adjusting feed ratios to favor carbon removal from the surface is discussed in detail. It is shown that a nickel-supported-on-alumina catalyst completely converts bio-ethanol and high hydrogen yields are obtained. High temperatures and water-to-ethanol ratios can promote hydrogen production. There is no evidence that the water-gas shift reaction occurs over nickel-based catalysts. Carbon formation can be minimized by using high water-to-ethanol ratios. The presence of oxygen in the feed plays a favorable effect on the carbon deposition, but the carbon monoxide production is not reduced. There are several reaction pathways that could occur in the bio-ethanol steam reforming process, and the catalyst produces ethylene and acetaldehyde as intermediate products. The region of carbon formation depends on the temperature as well as the water-to-ethanol and oxygen-to-ethanol molar ratios. Finally, an overall reaction scheme as a function of temperature is proposed. The best catalysts appear to be those that are sufficiently basic to inhibit the dehydration of ethanol to ethylene, which subsequently polymerizes and causes coke formation.

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“…The overwhelming majority is chemically bound as H 2 O in water and to liquid or gaseous hydrocarbons. 4 Therefore, high-purity hydrogen 8 K. Kinouchi et. al. must be separated from the mixture including the products and the un-reacted raw materials under the reaction to generate hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Permeability of Palladium Membrane for Steam-Reforming of Bio-Ethanol Using the Membrane Reactor

Kinouchi

Katoh

Horikawa

et al. 2012

Int. J. Mod. Phys. Conf. Ser.

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A Palladium membrane was prepared by electro-less plating method on porous stainless steel. The catalytic hydrogen production by steam-reforming of biomass-derived ethanol (bio-ethanol) using a Pd membrane was analyzed by comparing it with those for the reaction using reagent ethanol (the reference sample). And the hydrogen permeability of the palladium membrane was investigated using the same palladium membrane (H 2 /He selectivity = 249, at P = 0.10 MPa, 873 K). As a result, for bio-ethanol, deposited carbon had a negative influence on the hydrogen-permeability of the palladium membrane and hydrogen purity. The sulfur content in the bio-ethanol may have promoted carbon deposition. By using a palladium membrane, it was confirmed that H 2 yield (%) was increased. It can be attributed that methane was converted from ethanol and produced more hydrogen by steam reforming, due to the in situ removal of hydrogen from the reaction location.

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Bio-ethanol steam reforming: Insights on the mechanism for hydrogen production

Cited by 185 publications

References 20 publications

Catalytic Hydrogen Production from Bioethanol

Catalytic Hydrogen Production from Bioethanol

Hydrogen Production by the Steam Reforming of Bio-Ethanol over Nickel-Based Catalysts for Fuel Cell Applications

Hydrogen Permeability of Palladium Membrane for Steam-Reforming of Bio-Ethanol Using the Membrane Reactor

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