Simultaneous shift reaction and carbon dioxide separation for the direct production of hydrogen

Han, Congying; Harrison, Douglas P.

doi:10.1016/0009-2509(94)00266-5

Cited by 216 publications

(141 citation statements)

References 5 publications

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“…The time for breakthrough decreased with the increase of gas superficial velocities. The simulated results are in agreement with the experimental results reported in the literatures (Han andHarrison 1994 andJohnsen et al, 2006a).…”

Section: Resultssupporting

confidence: 90%

“…The hydrogen fraction dropped to about 0.75 mol/mol, which is near the equilibrium of SMR. Three stages exist, two stable stages of pre-breakthrough and postbreakthrough, and one rapidly changed stage of breakthrough, which is similar to the experimental results of Han and Harrison (1994) and Johnsen et al (2006a).…”

Section: Sorbent Capacity and Breakthroughsupporting

confidence: 83%

“…In this process, carbon dioxide is captured by an on-line sorbent, and the chemical equilibrium is shifted to the product side of the SMR reaction. Therefore, the higher hydrogen production may be obtained (Han and Harrison 1994). The sorbent with the adsorbed carbon dioxide can be regenerated using the temperature or pressure swing desorption to release the CO 2 for storage or other treatment.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO2 capture as operated in fluidized bed reactors

Wang

Chao

Jakobsen

2011

Clean Techn Environ Policy

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A three-dimensional (3D) Eulerian two-fluid model with an in-house code was developed to simulate the gas-particle two-phase flow in the fluidized bed reactors. The CO 2 capture with Ca-based sorbents in the steam methane reforming (SMR) process was studied with such model combined with the reaction kinetics. The sorptionenhanced steam methane reforming (SE-SMR) process, i.e., the integration of the process of SMR and the adsorption of CO 2 , was carried out in a bubbling fluidized bed reactor. The very high production of hydrogen in SE-SMR was obtained compared with the standard SMR process. The hydrogen molar fraction in gas phase was near the equilibrium. The breakthrough of the sorbent and the variation of the composition in the breakthrough period were studied. The effects of inlet gas superficial velocity and steam-to-carbon ratio (mass ratio of steam to methane in the inlet gas phase) on the reactions were studied. The simulated results are in agreement with the experimental results presented by Johnsen et al. (2006a, Chem Eng Sci 61:1195-1202.

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Section: Resultssupporting

confidence: 90%

Section: Sorbent Capacity and Breakthroughsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO2 capture as operated in fluidized bed reactors

Wang

Chao

Jakobsen

2011

Clean Techn Environ Policy

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“…1,2 CaO has also been demonstrated for selective, in situ CO 2 separation from other reaction products produced in a combined methane reforming/water gas shift reactor resulting in improved feedstock conversion. [3][4][5][6][7][8][9] Energy storage systems based on reaction 1 have also been investigated because of the high exothermicity of the carbonation reaction. [10][11][12] The major challenge associated with some practical applications of reaction 1 is a lack of total reversibility.…”

Section: Introductionmentioning

confidence: 99%

Development of a CaO-Based CO₂ Sorbent with Improved Cyclic Stability

Albrecht

Wagenbach

Satrio

et al. 2008

Ind. Eng. Chem. Res.

148

118

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The carbonation of CaO is an attractive method for removing CO2 from hot gas mixtures. However, regeneration and reuse of a CaO-based sorbent causes a gradual decline in absorption capacity, which ultimately limits the life of the material. Various methods have been proposed for increasing the life cycle performance of a CaO-based sorbent. Two of these methods were selected for further investigation. One method incorporates an "inert" material in the sorbent, while a second method stabilizes the sorbent through controlled sintering. Promising results were achieved with both methods when they were applied separately to a sorbent derived from a natural limestone. In one case MgO was finely dispersed within the sorbent, where it served as an "inert" material in the sense that it did not absorb CO2. A concentration of approximately 20 wt % appeared to be nearly optimal. In a second case the sorbent was stabilized by calcining the material at 1100°Cfor 5 h. Although neither method produced a completely stable material, the stability of the sorbents was improved sufficiently so that by the end of a 1200-cycle test the absorption capacity of either of the treated sorbents was 45% greater than that of an untreated sorbent and the rate of decline was very small. The carbonation of CaO is an attractive method for removing CO 2 from hot gas mixtures. However, regeneration and reuse of a CaO-based sorbent causes a gradual decline in absorption capacity, which ultimately limits the life of the material. Various methods have been proposed for increasing the life cycle performance of a CaO-based sorbent. Two of these methods were selected for further investigation. One method incorporates an "inert" material in the sorbent, while a second method stabilizes the sorbent through controlled sintering. Promising results were achieved with both methods when they were applied separately to a sorbent derived from a natural limestone. In one case MgO was finely dispersed within the sorbent, where it served as an "inert" material in the sense that it did not absorb CO 2 . A concentration of approximately 20 wt % appeared to be nearly optimal. In a second case the sorbent was stabilized by calcining the material at 1100°C for 5 h. Although neither method produced a completely stable material, the stability of the sorbents was improved sufficiently so that by the end of a 1200-cycle test the absorption capacity of either of the treated sorbents was 45% greater than that of an untreated sorbent and the rate of decline was very small.

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“…The suitability of metal oxides (MexOy) in capturing CO2 at temperatures between 550 C and 750 C at atmospheric pressure (101.3 kPa) has been demonstrated in the past six decades (Dou et al 2010;Hyatt, Cutler, and Wadsworth 1958;Pimenidou et al 2010b;Squires 1967). The key reaction for the capture of CO2 by CaO is the following: CaO + CO2 CaCO3, which is considered in post-combustion or in situ capture of CO2 processes as well as in energy storage (Aihara et al 2001) with further encounter in flue gas CO2 separation (Han and Harrison 1994) and hydrocarbon and water gasification for H2 production (Gupta and Fan 2002). The exothermicity of this reaction has also proven to offer autothermal intervals during in situ use in chemical looping steam reforming for hydrogen production (Pimenidou et al 2010b).…”

Section: Introductionmentioning

confidence: 99%

Dolomite study forin situCO₂capture for chemical looping reforming

Pimenidou

Dupont

2013

International Journal of Ambient Energy

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The non-isothermal kinetic and thermal behaviour of a naturally formed dolomite in conditions that approach in situ CO2 capture in chemical looping reforming, were investigated. The performance of this dolomite was studied at micro-scale in 'dry' conditions, as well as at macro-scale in 'dry' and 'wet' conditions to investigate the effects of scale (3 mg, 2.5 g), partial pressures of CO 2 (< 15 kPa) and steam, and deactivation upon limited cycling. The carbonation and calcination kinetics were modelled using an improved iterative Coats-Redfern method. Increasing CO 2 partial pressures on the 'dry' macroscale exacerbated the experimental carbonation conversions in an inversely proportional trend when compared with those at micro-scale. The presence of steam had a positive effect on CO 2 chemisorption. Steam had a negligible influence on the calcination activation energies. The activation energies of carbonation were increased for the experiments at the highest CO 2 partial pressures under wet conditions.

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Simultaneous shift reaction and carbon dioxide separation for the direct production of hydrogen

Cited by 216 publications

References 5 publications

Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO2 capture as operated in fluidized bed reactors

Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO2 capture as operated in fluidized bed reactors

Development of a CaO-Based CO₂ Sorbent with Improved Cyclic Stability

Dolomite study forin situCO₂capture for chemical looping reforming

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Simultaneous shift reaction and carbon dioxide separation for the direct production of hydrogen

Cited by 216 publications

References 5 publications

Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO2 capture as operated in fluidized bed reactors

Numerical study of hydrogen production by the sorption-enhanced steam methane reforming process with online CO2 capture as operated in fluidized bed reactors

Development of a CaO-Based CO2 Sorbent with Improved Cyclic Stability

Dolomite study forin situCO2capture for chemical looping reforming

Contact Info

Product

Resources

About

Development of a CaO-Based CO₂ Sorbent with Improved Cyclic Stability

Dolomite study forin situCO₂capture for chemical looping reforming