A comprehensive energy–exergy-based assessment and parametric study of a hydrogen production process using steam glycerol reforming

Hajjaji, Noureddine; Chahbani, Amna; Khila, Zouhour; Pons, Marie‐Noëlle

doi:10.1016/j.energy.2013.10.023

Cited by 37 publications

(16 citation statements)

References 58 publications

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“…High S/C ratios help to shift the WGS and the methane reforming reactions towards the formation of H 2 [2]. These findings are in accordance with other works in the literature such as Hajjaji et al [34], and Silva et al [5]. These studies reported that the reforming temperature exerts a greater impact than the S/C ratio on the thermodynamic results.…”

Section: Thermodynamic Resultssupporting

confidence: 82%

Analysis and optimisation of H2 production from crude glycerol by steam reforming using a novel two step process

Remón

Jarauta-Córdoba

García

et al. 2016

Fuel Processing Technology

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This work studies the valorisation of biodiesel-derived glycerol to produce a hydrogen rich gas by means of a two-step sequential process. Firstly, the crude glycerol was purified with acetic acid to reduce problematical impurities. The effect of the final pH (5-7) on the neutralisation process was addressed and it was found that a pH of 6 provided the best phase separation and the greatest glycerol purity. Secondly, the refined glycerol was upgraded by catalytic steam reforming and this step was theoretically and experimentally studied. The theoretical study analyses the effect of the temperature (400-700 ºC), glycerol concentration (10-50 wt.%) and N 2 (225-1347 cm 3 STP/min) and liquid flow (0.5-1 mL/min) rates on the thermodynamic composition of the gas. The results show that the temperature and glycerol concentration exerted the greatest influence on the thermodynamics. The experimental study considers the effect of the temperature (400-700 ºC), glycerol concentration (10-50 wt.%) and spatial time (3-17 g catalyst min/ g glycerol) on the product distribution in carbon basis (gas, liquid and solid) and on the composition of the gas and liquid phases. The experiments were planned according to a 2 level 3 factor Box-Wilson Central Composite Face Centred (CCF, :  1) design, which is suitable for studying the influence of each variable as well as all the possible interactions between variables. The results were analysed with an analysis of variance (ANOVA) with 95% confidence, enabling the optimisation of 2 the process. The gas phase was made up of a mixture of H 2 (65-95 vol.%), CO 2 (2-29 vol.%), CO (0-18 vol.%) and CH 4 (0-5 vol.%). Temperatures of 550 ºC and above enabled thermodynamic compositions for the gas to be achieved and helped diminish carbon formation. A possible optimum for H 2 production was found at a temperature of around 680 ºC, feeding a glycerol solution of 37 wt.% and using a spatial time of 3 g catalyst min/g glycerol. These conditions provide a 95% carbon conversion to gas, having the following composition: 67 vol.% H 2 , 22 vol.% CO 2 , 11 vol.% CO and 1 vol.% CH 4 .

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Section: Thermodynamic Resultssupporting

confidence: 82%

Analysis and optimisation of H2 production from crude glycerol by steam reforming using a novel two step process

Remón

Jarauta-Córdoba

García

et al. 2016

Fuel Processing Technology

View full text Add to dashboard Cite

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“…For the case of GSR, higher pressures lead to a lower hydrogen production in the equilibrium. Moreover, enhanced formation of methane has also been verified [25,[28][29][30]. Therefore, it results to be advantageous to use lower pressures not only because it is economically more attractive (as far as the pressure is not too low) but also because it leads, under equilibrium, to higher H2 production ( Fig.…”

Section: Conventional Gsrmentioning

confidence: 99%

“…Temperatures between 580-702 ºC, WGFRs between 9-12 and atmospheric pressure have been reported in the literature as optimum conditions [25][26][27]29].…”

Section: Conventional Gsrmentioning

confidence: 99%

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Challenges and strategies for optimization of glycerol steam reforming process

Silva

Soria

Madeira

2015

Renewable and Sustainable Energy Reviews

202

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The steam reforming of the main biodiesel by-product, glycerol, has been catching up the interest of the scientific community in the last years. The use of glycerol for hydrogen production is an advantageous option not only because glycerol is renewable but also because it's use would lead to the decrease of the price of biodiesel, thus making it more competitive. Consequently, the use of biodiesel at large scale would significantly reduce CO2 emissions comparatively to fossil fuels. Moreover, hydrogen itself is seen as a very attractive clean fuel for transportation purposes.Therefore, the industrialization of the glycerol steam reforming (GSR) process would have a tremendous global environmental impact. In the last years, intensive research regarding GSR thermodynamics, catalysts, reaction mechanisms and kinetics, and innovative reactor configurations (sorption enhanced reactors (SERs) and membrane reactors (MRs)) has been done, aiming for improving the process effectiveness. In this review, the main challenges and strategies adopted for optimization of GSR process are addressed, namely the GSR thermodynamic aspects, the last developments on catalysis and kinetics, as well as the last advances on GSR performed in SERs and MRs.

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“…The carbon monoxide yield is not included here as well since only residual amounts were observed. Constant WGFR and pressure of 9 and 1 atm, respectively, were used since such conditions have been reported in many works [13][14][15][16] as the most favourable conditions for GSR.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Thermodynamic analysis of Glycerol Steam Reforming for hydrogen production with in situ hydrogen and carbon dioxide separation

Silva

Soria

Madeira

2015

Journal of Power Sources

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A thermodynamic study of Glycerol Steam Reforming (GSR) for hydrogen production with in situ carbon dioxide and hydrogen (reaction products) simultaneous removal was performed. The sorption-enhanced membrane reactor (SEMR) was divided into multiple subGibbs reactors and the Gibbs free energy minimization method was employed. The effects of temperature (600-800 K), molar water-to-glycerol feed ratio (WGFR) (3-9), pressure (1-5 atm) and fraction of hydrogen and carbon dioxide removal ( , 0-0.99) on the GSR process were target of investigation. A hydrogen yield (total moles of hydrogen produced/mole of reacted glycerol) very close to the stoichiometric value of 7 was obtained at 700 K, WGFR of 9, 1 atm and for 2 = 0.99 and 2 = 0.80. This corresponds to an enhancement of 217%, 47% and 22% in terms of hydrogen yield comparatively to the traditional reactor (TR), sorption-enhanced reactor (SER) with carbon dioxide capture ( 2 = 0.99) and membrane reactor (MR) with hydrogen separation ( 2 = 0.80), respectively. In terms of coke, its formation was only observed under WGFRs below the stoichiometric value of 3.

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A comprehensive energy–exergy-based assessment and parametric study of a hydrogen production process using steam glycerol reforming

Cited by 37 publications

References 58 publications

Analysis and optimisation of H2 production from crude glycerol by steam reforming using a novel two step process

Analysis and optimisation of H2 production from crude glycerol by steam reforming using a novel two step process

Challenges and strategies for optimization of glycerol steam reforming process

Thermodynamic analysis of Glycerol Steam Reforming for hydrogen production with in situ hydrogen and carbon dioxide separation

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