A study on high temperature CO 2 capture by improved hydrotalcite sorbents

Hanif, Aamir; Dasgupta, Soumen; Divekar, Swapnil; Arya, Alka; Garg, Mansi; Nanoti, Anshu

doi:10.1016/j.cej.2013.09.076

Cited by 83 publications

(50 citation statements)

References 23 publications

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“…The thermodynamic analysis was performed for temperatures in the range of 600-800 K, pressures between 1-5 atm and WGFRs between 3-9 (realistic operation conditions for hydrogen selective membranes [6,7] and carbon dioxide sorbents [5,8,9], which are close to those typically employed in the GSR [10,11]) ; the study considered also hydrogen removal fractions in the range of 0-0.99 and a carbon dioxide removal fraction of 0.99 (for the reasons explained in a posterior section). For all the cases, the yields of hydrogen, methane, carbon dioxide and carbon monoxide were analyzed.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…Different materials like hydrotalcites [140][141][142][143][144], CaO-based materials [145][146][147][148][149], lithium zirconates [150][151][152][153][154] and lithium silicates [155][156][157][158][159], among others, have been reported in the literature as CO2 sorbents for SERs applications. It is expected from a good CO2 sorbent to couple in a GSR process to present high CO2 capture capacity and selectivity at moderated temperatures (300-500 ºC), good regenerability (adequate sorptiondesorption kinetics), good hydrothermal and mechanical stability and low-cost [160][161][162][163].…”

Section: Co2 Sorbentsmentioning

confidence: 99%

Challenges and strategies for optimization of glycerol steam reforming process

Silva

Soria

Madeira

2015

Renewable and Sustainable Energy Reviews

204

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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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“…Experimental evidences also pointed that after more than 50 operative cycles, potassium hydrotalcites showed no significant decay [106]. Adsorbents like CaO-based materials, lithium zirconates and silicates show generally a lessen CO 2 capacity and slowest adsorption kinetics at 300-400 • C, regeneration temperatures above 650 • C and a moderate inactivation due to sintering of the active surfaces [101]. Their higher adsorbing capacities occur at much higher temperatures (say, 700-850 • C).…”

Section: General Case Studymentioning

confidence: 96%

“…The different CO 2 sorbents are materials such as hydrotalcites, a group of clay minerals with a structure of hydroxide layers [100,101], lithium zirconates or lithium silicates [102][103][104][105]. The sorption capacity (mol/kg) of K-doped hydrotalcite is significantly high (9.4 mol·kg −1 ) under wet conditions.…”

Section: General Case Studymentioning

confidence: 99%

“…Obviously, the temperature reduction is mandatory for the diminishing of production costs and therefore there is a convenience in working at temperatures in the range of 300-500 • C. Under this range of temperatures, hydrotalcites have been reported as having good performance on the kinetics of CO 2 adsorption capacities, with a special enhancement of that performance under wet conditions typical of GSR processes [100,101]. The sorbent/glycerol ratio is also a relevant variable in GSR.…”

Section: General Case Studymentioning

confidence: 99%

See 1 more Smart Citation

Upgrading the Glycerol from Biodiesel Production as a Source of Energy Carriers and Chemicals—A Technological Review for Three Chemical Pathways

Rodrigues

Bordado²,

Santos³

2017

Energies

130

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Abstract:Glycerol is a by-product of biodiesel obtained from biomass, accounting for 10% of the biodiesel production. In the context of a green economy, aiming for a reduction of the emission of atmospheric greenhouse gases emissions, the demand of biodiesel is expected to increase vastly, in parallel with a side glut supply of glycerol. Given the high cost of biodiesel compared with its fossil congener, upgrading of glycerol into added-value products can represent a secondary income source and turn the production of such alternative fuels economically sustainable in the long term. The glycerol obtained as by-product of biodiesel from biomass is in a crude form and must be purified. Some industrial solutions and applications were therein geared. The survey presented in this work, based on a reviewing of the existing literature, examines three routes for the valuing glycerol into energy carriers and chemicals, namely, carbonation, acylation, and steam reforming to hydrogen. The latter is embodied of great interest and importance, insofar that hydrogen by itself is considered as straighforward clean fuel for transportation uses, due to its high calorific power and to recent advances in fuel cells. We also have focused on the chain value from biomass to energies carriers through these pathways.

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A study on high temperature CO 2 capture by improved hydrotalcite sorbents

Cited by 83 publications

References 23 publications

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

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

Challenges and strategies for optimization of glycerol steam reforming process

Upgrading the Glycerol from Biodiesel Production as a Source of Energy Carriers and Chemicals—A Technological Review for Three Chemical Pathways

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