Catalytic steam reforming of ethanol for hydrogen production: Brief status

Bineli, Aulus Roberto Romão; Tasić, Marija B.; Filho, Rubens Maciel

doi:10.2298/ciceq160216017b

Cited by 10 publications

(10 citation statements)

References 13 publications

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“…The ethanol and the steam decays at the same slope, and according to Equation (13) the amounts of ethanol and the steam are proportional to each other. Similar values have been reported in Reference [4]. From this figure it can be seen that the HRR produced by the ethanol burner, can provide the required heat flux for maintaining the reforming process.…”

Section: Multiphysics Results For Low Heat Flux Inputsupporting

confidence: 86%

“…It can be produced from different kinds of renewable feedstocks, such as ethanol. The use of ethanol as a raw material presents several advantages because it is easy to transport, biodegradable, has low toxicity, contains high hydrogen content, and easy to store and handle [4]. Furthermore, ethanol is economically, environmentally and strategically attractive as an energy source.…”

Section: Introductionmentioning

confidence: 99%

“…Conclusively, amongst the various processes and primary fuels that have been proposed for hydrogen production in fuel cell applications, steam reforming of ethanol is very attractive. Ethanol steam reforming (ESR) proceeds at temperatures in the range of 300-600 • C, which is significantly lower than those required for CH 4 or gasoline reforming. This is an important consideration for the improved heat integration of fuel cell vehicles.…”

Section: Introductionmentioning

confidence: 99%

“…A 3D CFD simulation pioneering study of the ESR in microreactors with square channels has been carried out by Uriz et al [8]. A phenomenological kinetic model based on simple power-law rate equations and considering the following reactions-ethanol dehydrogenation to acetaldehyde, acetaldehyde steam reforming to H 2 and CO 2 , ethanol decomposition to CO, CH 4 and H 2, and the water-gas shift-describes satisfactorily the ESR over a Co 3 O 4 -ZnO catalyst. The CFD computational study shows that high reforming temperatures (above 625 • C) should be avoided.…”

Section: Introductionmentioning

confidence: 99%

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CFD Simulation of Ethanol Steam Reforming System for Hydrogen Production

Davidy¹

2018

ChemEngineering

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Hydrogen could be a promising source fuel, and is often considered as a clean energy carrier as it can be produced by ethanol. The use of ethanol presents several advantages, because it is a renewable feedstock, easy to transport, biodegradable, has low toxicity, contains high hydrogen content, and easy to store and handle. Reforming ethanol steam occurs at relatively lower temperatures, compared with other hydrocarbon fuels, and has been widely studied due to the high yield provided for the formation of hydrogen. A new computational fluid dynamics (CFD) simulation model of the ethanol steam reforming (ESR) has been developed in this work. The reforming system model is composed from an ethanol burner and a catalytic bed reactor. The liquid ethanol is burned inside the firebox, then the radiative heat flux from burner is transferred to the catalytic bed reactor for transforming the ethanol steam mixture to hydrogen and carbon dioxide. The proposed computational model is composed of two phases-Simulation of ethanol burner by using Fire Dynamics Simulator software (FDS) (version 5.0) and a multi-physics simulation of the steam reforming process occurring inside the reformer. COMSOL multi-physics software (version 4.3b) has been applied in this work. It solves simultaneously the fluid flow, heat transfer, diffusion with chemical reaction kinetics equations, and structural analysis. It is shown that the heat release rate produced by the ethanol burner, can provide the necessary heat flux required for maintaining the reforming process. It has been found out that the mass fractions of the hydrogen and carbon dioxide mass fraction are increased along the reformer axis. The hydrogen mass fraction increases with enhancing the radiation heat flux. It was shown that Von Mises stresses increases with heat fluxes. Safety issues concerning the structural integrity of the steel jacket are also addressed. This work clearly shows that by using ethanol which has low temperature conversion, the decrease in structural strength of the steel tube is low. The numerical results clearly indicate that under normal conditions of the ethanol reforming (The temperature of the steel is about 600 • C or 1112 • F), the rupture time of the HK-40 steel alloy increases considerably. For this case the rupture time is greater than 100,000 h (more than 11.4 years).

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Section: Multiphysics Results For Low Heat Flux Inputsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFD Simulation of Ethanol Steam Reforming System for Hydrogen Production

Davidy¹

2018

ChemEngineering

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“…Here, our results show that higher water: ethanol ratio favours methane reforming and water gas shift reaction, as expected. [24][25][26][27]…”

Section: Co + H 2 O → Co 2 + H 2 ;mentioning

confidence: 99%

BINIVOX catalyst for hydrogen production from ethanol by low temperature steam reforming (LTSR)

et al. 2017

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Nickel doped bismuth vanadate [Bi 4 (V 0.90 Ni 0.10) 2 O 11−δ ;BINIVOX] calcined at 800 • C (BINIVOX-800) catalyst is prepared by a solution combustion method. The catalytic activity study is carried in the temperature range of 250-400 • C, and with the molar feed ratios of water: ethanol at 23:1 and 2.5:1. The study reveals an increase in the ethanol conversion and selectivity of carbon dioxide & hydrogen but a decrease in the selectivity of carbon monoxide and methane with an increase in temperature and water: ethanol mole ratio. Fresh and used catalysts are characterized using DTA, TGA, XRD and FTIR. XRD results reveal that the fresh catalyst is phase pure γ-BINIVOX. The phase purity and crystallinity of the catalyst is retained after 30 h of activity study.

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