Thermodynamic analysis of acetic acid steam reforming for hydrogen production

Goicoechea, Saioa; Ehrich, Heike; Arias, P.L.; Kockmann, Norbert

doi:10.1016/j.jpowsour.2015.01.012

Cited by 65 publications

(21 citation statements)

References 24 publications

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“…H 2 can be obtained via reforming of fossil fuel (nature gas and coal), which always result in additional emission of greenhouse gases. As a carbon‐neutral energy source, biomass can be decomposed via fast‐pyrolysis to produce bio‐oil, where HAc is one of the main component and can be converted to H 2 by steam reforming (SR) . Auto‐thermal reforming (ATR) of HAc, which is composed of SR and catalytic partial oxidation (CPOX), can adjust the reaction net heat by regulating the feeding gas ratio of O 2 /HAc …”

Section: Introductionmentioning

confidence: 99%

“…As a carbon-neutral energy source, biomass can be decomposed via fastpyrolysis to produce bio-oil, where HAc is one of the main component and can be converted to H 2 by steam reforming (SR). [2][3][4] Auto-thermal reforming (ATR) of HAc, which is composed of SR and catalytic partial oxidation (CPOX), can adjust the reaction net heat by regulating the feeding gas ratio of O 2 /HAc. 5 In reforming process, transitional metals of cobalt and nickel were found active to breakage of C-C bonds.…”

Section: Introductionmentioning

confidence: 99%

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Zn‐Al hydrotalcite‐derived Co _x Zn _y AlO _z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Xie

Zhou

et al. 2019

Int J Energy Res

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Summary Auto‐thermal reforming (ATR) of acetic acid (HAc) is considered as a promising route for hydrogen generation from renewable resources, while oxidation, coking, and sintering need to be addressed for durable catalysts in ATR. In the current work, Zn‐Al hydrotalcite‐derived CoxZnyAlOz catalysts were prepared by co‐precipitation and evaluated in a fixed‐bed tubular quartz continuous‐flow reactor. The Co0.70Zn3.30AlO5.5 ± δ catalyst presented a HAc conversation near 100% and a stable hydrogen yield near 3.01 mol‐H2/mol‐HAc. The characterization results of XRD, H2‐TPR, BET, SEM, XPS, and TG indicated that the hydrotalcite structure was obtained via co‐precipitation method; over the hydrotalcite‐derived mixed oxides, (a) the specific surface area was increased with high dispersion of Co, (b) the phases of ZnO with spinel of ZnAl2O4,CoAl2O4, Co3O4, and ZnCo2O4 were beneficial to improve resistance to coking and oxidation, and (c) the relative stability of Co species over ZnO and spinel phases helps to suppress sintering. Meanwhile, ratio of O/C and temperatures near 0.28 and 650 °C, respectively, were also evaluated and proposed as optimized conditions for hydrogen generation, and the durable Co0.70Zn3.30AlO5.5 ± δ catalyst produced a rate of 114.9 mmol‐H2/s/g‐catalyst in a 15‐hour ATR test, showing promising potential for hydrogen generation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Zn‐Al hydrotalcite‐derived Co _x Zn _y AlO _z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Xie

Zhou

et al. 2019

Int J Energy Res

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“…The Gibbs energy minimization method (non-stoichiometric approach) has been widely used to determine the equilibrium [19,21,22]. The main advantage of this method is that there is no necessity of knowing the exact reactions involved.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Thermodynamics of sulfur poisoning in solid oxide fuel cells revisited: The effect of H2S concentration, temperature, current density and fuel utilization

Silva

Heck

2015

Journal of Power Sources

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h i g h l i g h t sNieS Gibbs energy diagram systematizes understanding of sulfur interaction with Ni. Whenever sulfur chemical potential is increased, deactivation by sulfur is greater. Increasing current density increases the degree of sulfur poisoning of Ni catalyst. Current density effect becomes remarkable at fuel utilizations >90%. Thermodynamic results are in agreement with recent experimental evidences. a b s t r a c tThermodynamics of sulfur poisoning in SOFCs is revisited in the present study, aiming at contributing to the understanding of the effects of different operating parameters on deactivation by sulfur. NieS Gibbs energy diagram shows that, whenever sulfur chemical potential is increased, the catalyst poisoning becomes greater, due to increase in nickel sulfide activity, which is a strictly increasing function of sulfur coverage on Ni surface. For studying current density effect, simulations are carried out in the range of 0 (OCV) e 1 A cm À2 , at 1123 K, considering methane as a fuel. At 10 ppm H 2 S, an increase in current density from 0 (OCV) to 0.5 A cm À2 results in a slight increase in the nickel sulfide activity from 3.0 Â 10 À6 to 1.2 Â 10 À5 ; however, at 1 A cm À2 , nickel sulfide activity is 25.000 times higher than at 0.5 A cm À2 . At 1 A cm À2 , H 2 and CO are almost entirely converted to H 2 O and CO 2 by electrochemical reaction. Therefore, the effect of current density becomes remarkable when fuel utilization approaches 100%. These theoretical findings are corroborated by the recent experimental evidences related to the detrimental influence of current density on SOFC performance during sulfur poisoning.

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“…Hetero-/homogeneous combustion of hydrogen is an important oxidation reaction in lean-burn catalytic combustion, micro-propulsion systems, and as a vital reaction in integrated micro-chemical systems in particular to produce hydrogen from hydrocarbons in suitable catalytic microreformers for portable fuel cell applications [21], as a result of its many excellent advantages. The examples of these excellent advantages include strong exothermicity, very high flame velocities, and wide flammability limits in particular.…”

Section: Introductionmentioning

confidence: 99%

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

Chen

Liu

Gao

et al. 2016

International Journal of Hydrogen Energy

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Thermodynamic analysis of acetic acid steam reforming for hydrogen production

Cited by 65 publications

References 24 publications

Zn‐Al hydrotalcite‐derived Co _x Zn _y AlO _z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Zn‐Al hydrotalcite‐derived Co _x Zn _y AlO _z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Thermodynamics of sulfur poisoning in solid oxide fuel cells revisited: The effect of H2S concentration, temperature, current density and fuel utilization

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

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Thermodynamic analysis of acetic acid steam reforming for hydrogen production

Cited by 65 publications

References 24 publications

Zn‐Al hydrotalcite‐derived Co x Zn y AlO z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Zn‐Al hydrotalcite‐derived Co x Zn y AlO z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Thermodynamics of sulfur poisoning in solid oxide fuel cells revisited: The effect of H2S concentration, temperature, current density and fuel utilization

Effects of heterogeneous–homogeneous interaction on the homogeneous ignition in hydrogen-fueled catalytic microreactors

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Zn‐Al hydrotalcite‐derived Co _x Zn _y AlO _z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid

Zn‐Al hydrotalcite‐derived Co _x Zn _y AlO _z catalysts for hydrogen generation by auto‐thermal reforming of acetic acid