Simulations of Hydrogen Production by Methanol Steam Reforming

Chiu, Yu-Jen; Chiu, Han-Chieh; Hsieh, Ren-Horn; Jang, Jer‐Huan; Jiang, Bo-Yi

doi:10.1016/j.egypro.2018.11.081

“…This reaction can offer numerous advantages such as faster reaction kinetics, lower Ea, and ability to generate H 2 at subzero temperatures even in the presence of metal‐free catalysts with readily regeneration capabilities . Amidst the solvents, methanol provides some accountable advantages over hydrolysis, as H 2 release from NaBH 4 methanolysis can be conveniently run at low temperatures (T < 0°C) efficiently, eg, −20°C, abiding by the following equation:

{NaBH}_{4} + {4CH}_{3} OH \to NaB {({OCH}_{3})}_{4} + {4H}_{2} .

…”

Section: Introductionmentioning

confidence: 99%

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Ari

¹

,

Ay

²

,

Sunol

³

et al. 2019

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Summary Carbon black (CB) obtained from used car tire rubbers were treated with concentrated sulfuric and nitric acids. The oxidized CB (CB‐COO‐Na+) is subsequently modified with epichlorohydrin (ECH) and amines including polyethylene imine (PEI). These modified CBs such as CB‐PEI are used as metal‐free catalysts in methanolysis of sodium borohydride (NaBH4) to produce hydrogen. The hydrogen generation rate (HGR) of 3089 ± 44.69 mL.min‐1.g‐1 is accomplished at room temperature with CB‐PEI‐hydrochloric acid (HCl) catalyst. The resulting activation energy of 34.7 kJ/mol for the temperature range of −20°C to +30°C compares favorably to most of alternative catalysts reported in literature while reaction catalyzing capabilities of CB‐PEI‐HCl particles extend to the subzero temperature range (−20°C‐0°C). The reuse and regeneration studies conducted for the CB‐PEI‐HCl catalyst showed that these catalysts do provide complete conversion at every use up to five consecutive runs and retain 50 ± 2.5% of the original hydrogen generation rate at the fifth consecutive reuse. The CBs‐based catalysts are fully regenerated with HCl treatment.

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“…The reaction kinetics of the methanol steam reforming process have been widely investigated. The following three processes are known to be the main reactions of the methanol steam reforming reaction [10][11][12][13][14][15][16]. The methanol steam reforming reaction is described by three elementary reactions: methanol steam reforming reaction (SR), methanol decomposition (MD), and water gas shift (WGS) reaction.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…where E a is the activation energy, A is the pre-exponential factor, and k is the reaction rate constant. The kinetics constants of the methanol steam reforming reaction at 200 to 300 °C are shown in Table 2 [14][15][16][17]. Water-gas shift reaction 2.002 × 10 9 9.27 × 10 7…”

Section: Methanol Steam Reforming Reaction (Sr)mentioning

confidence: 99%

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

Song¹,

Kim²,

Yu³

et al. 2021

Advances in Energy Research

0

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A methanol steam reformer converts methanol and steam into a hydrogen-rich mixture through an endothermic reaction. The methanol reformer is divided into a reaction section and a heat supply section that transfers thermal energy from 200 to 300 °C. This study presents the behavior of the methanol steam reforming reaction using the latent heat of the steam. A numerical analysis was separately conducted for two different regimes assuming constant heat flux conditions. A methanol steam reformer is an annulus structure that has a phase change heat transfer from an outer tube to an inner tube. Different from the steam zone temperature in the tube, the latent heat of steam condensation decreases, and there is a gradual between-wall temperature decrease along the longitudinal direction. Since the latent heat of steam condensation is very sensitive to the requested heat from the reformer, it is necessary to consider a refined design of a methanol reformer to obtain a large enough amount of heat by steam condensation.

show abstract

“…The reaction kinetics of the methanol steam reforming process have been widely investigated. The following three processes are known to be the main reactions of the methanol steam reforming reaction [10][11][12][13][14][15][16]. The methanol steam reforming reaction is described by three elementary reactions: methanol steam reforming reaction (SR), methanol decomposition (MD), and water gas shift (WGS) reaction.…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…The kinetics constants of the methanol steam reforming reaction at 200 to 300 • C are shown in Table 2 [14][15][16][17].…”

Section: Reaction Kineticsmentioning

confidence: 99%

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

Song

¹

,

Kim

²

,

Yu

³

et al. 2020

Energies

3

0

View full text Add to dashboard Cite

A methanol steam reformer converts methanol and steam into a hydrogen-rich mixture through an endothermic reaction. The methanol reformer is divided into a reaction section and a heat supply section that transfers thermal energy from 200 to 300 °C. This study presents the behavior of the methanol steam reforming reaction using the latent heat of the steam. A numerical analysis was separately conducted for two different regimes assuming constant heat flux conditions. A methanol steam reformer is an annulus structure that has a phase change heat transfer from an outer tube to an inner tube. Different from the steam zone temperature in the tube, the latent heat of steam condensation decreases, and there is a gradual between-wall temperature decrease along the longitudinal direction. Since the latent heat of steam condensation is very sensitive to the requested heat from the reformer, it is necessary to consider a refined design of a methanol reformer to obtain a large enough amount of heat by steam condensation.

show abstract

Simulations of Hydrogen Production by Methanol Steam Reforming

Cited by 31 publications

References 10 publications

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

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Simulations of Hydrogen Production by Methanol Steam Reforming

Cited by 31 publications

References 10 publications

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H 2 release studies from sodium borohydride methanolysis

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H 2 release studies from sodium borohydride methanolysis

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

A Computational Analysis of a Methanol Steam Reformer Using Phase Change Heat Transfer

Contact Info

Product

Resources

About

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis

Surface‐modified carbon black derived from used car tires as alternative, reusable, and regenerable catalysts for H ₂ release studies from sodium borohydride methanolysis