Comparative analysis of hydrogen production systems from biomass based on different absorbent regeneration processes

Qiao, Chuanling; Xiao, Yunhan; Xu, Xiang; Zhao, Lifeng; Wen-Dong, Tian

doi:10.1016/j.ijhydene.2006.03.009

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Although CaO presents some limitations in the temperature range of WGS interest [2][3][4], it has been proven to be an advantageous sorbent in the field of pre-combustion processes [5], chemical looping [6,7] and sorption enhanced hydrocarbon reforming [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification

et al. 2021

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The aim of this work is to identify the effect of the CaO phase as a CO2 sorbent and mayenite (Ca12Al14O33) as a stabilizing phase in a bi-functional material for CO2 capture in biomass syngas conditioning and cleaning at high temperature. The effect of different CaO weight contents is studied (0, 56, 85, 100 wt%) in sorbents synthesized by the wet mixing method. These high temperature solid sorbents are upgraded to bi-functional compounds by the addition of 3 or 6 wt% of nickel chosen as the metal active phase. N2 adsorption, X-ray diffraction, scanning electronic microscopy, temperature-programmed reduction analyses and CO2 sorption study were performed to characterize structural, textural, reducibility and sorption properties of bi-functional materials. Finally, sorption-enhanced reforming of toluene (chosen as tar model), of methane then of methane and toluene with bi-functional compounds were performed to study the best material to improve H2 content in a syngas, provided by steam biomass gasification. If the catalytic activity on the sorption enhanced reforming of methane exhibits a fast fall-down after 10–15 min of experimental test, the reforming of toluene reaches a constant conversion of 99.9% by using bi-functional materials.

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Section: Introductionmentioning

confidence: 99%

Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification

et al. 2021

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“…Calcium oxide (CaO) has been considered as the most advantageous CO 2 -sorbent within the mixed oxides family (Mg, Zn, Cu, K, Al, and Ca) because it carbonates (CBN, ) over a wider range of adsorption temperatures (200–700 °C), is easily available at a competitive price, , and is regenerated by calcination, even though it undergoes a strong reduction of sorption capacity under cyclic carbonation/calcination usage, because of sintering. − To face this issue, CaO is utilized in combined forms with inert stabilizers: dolomite is a natural material with this feature, while the literature refers to the synthetic CaO-based materials, with different inert phases (Al 2 O 3 or calcium–aluminates Ca x Al y O z above all). In situ CO 2 separation, that is, capture of CO 2 simultaneously to its production, was proposed as a promising strategy, , applicable to chemical looping combustion of hydrocarbons, , gasification with calcium looping cycle, − steam reforming of methane (SMR, ) ,− or higher hydrocarbons (SR, ). − Besides the net reduction of CO 2 emissions, the in situ CO 2 capture brings in an additional advantage, known as “sorption-enhancing”: the subtraction of CO 2 from the gaseous reaction environment displaces the equilibria of the water gas shift (WGS, ) and then of steam reforming (, ) toward products, therefore increasing outlet H 2 purity. All this considered, exploitation of CaO as CO 2 -sorbent appears as a versatile and promising practice to face the ever more urging issues related to climate change mitigation. − The effective application on a large scale needs experimental testing of efficient materials and technologies, as well as the refinement of modeling tools, in order to get reliable predictions of the CaO peculiar dynamic behavior in CBN () processes. This work is focused on the latter field.…”

Section: Introductionmentioning

confidence: 99%

“…4−7 To face this issue, CaO is utilized in combined forms with inert stabilizers: dolomite is a natural material with this feature, while the literature refers to the synthetic CaO-based materials, with different inert phases (Al 2 O 3 or calcium−aluminates Ca x Al y O z above all 2 ). In situ CO 2 separation, that is, capture of CO 2 simultaneously to its production, was proposed as a promising strategy, 8,9 applicable to chemical looping combustion of hydrocarbons, 10,11 gasification with calcium looping cycle, 12−15 steam reforming of methane (SMR, Reaction 2) 2,16−21 or higher hydrocarbons (SR, Reaction 3). 22−24 Besides the net reduction of CO 2 emissions, the in situ CO 2 capture brings in an additional advantage, known as "sorption-enhancing": the subtraction of CO 2 from the gaseous reaction environment displaces the equilibria of the water gas shift (WGS, Reaction 4) and then of steam reforming (Reaction 2, Reaction 3) toward products, therefore increasing outlet H 2 purity.…”

Section: Introductionmentioning

confidence: 99%

Determination of Kinetic and Diffusion Parameters Needed to Predict the Behavior of CaO-Based CO₂ Sorbent and Sorbent-Catalyst Materials

Giuliano

Gallucci

Foscolo

2020

Ind. Eng. Chem. Res.

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For about 10 years, this research group has developed and utilized a particle grain model (PGM), to simulate CO 2 -capture carried out by CaO-based porous particles. Chemical kinetics and diffusion parameters were either taken from literature studies or fixed by fitting experimental sorption data. As recently observed, this procedure was not fully satisfactory and revealed systematic, minor discrepancies between PGM numerical results and experimental data when predicting sorbents behavior during the initial chemically controlled regime of carbonation. This work deals with the experimental determination of kinetic and diffusion parameters, utilized in the PGM, by means of straightforward thermogravimetric analysis (TGA) tests on small samples of materials to be evaluated for CO 2 sorption and sorption-enhanced processes. To validate this procedure, the carbonation of two Ni−CaO−mayenite combined sorbent-catalyst materials (CSCMs) was studied in TGA. The experimental data so obtained were used to infer carbonation kinetic parameters tailored for each CSCM, which resulted to be compatible with investigated phenomena and previously proposed values, and allowed faithful PGM predictions at different operating temperatures. These parameters were then implemented in an axial dispersion plug flow reactor model for sorption enhanced steam methane reforming (SESMR): its predictions resulted in good agreement with experimental data from SESMR tests performed in packed beds.

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“…Despite of all those merits, the hybrid cycle system still releases CO 2 gas when the fossil fuels are used. As the problem of global warming has become prominent increasingly, reducing emissions of CO 2 gas has become an important research focus of energy power systems in the 21st century [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study on a novel solid oxide fuel cell/gas turbine hybrid cycle system with CO2 capture

Duan

Yang

et al. 2011

Int. J. Energy Res.

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SUMMARYA novel solid oxide fuel cell (SOFC)/gas turbine (GT) hybrid cycle system with CO 2 capture is proposed based on a typical topping cycle SOFC/GT hybrid system. The H 2 gas is separated from the outlet mixture gas of SOFC1 anode by employing the advanced ceramic proton membrane technology, and then, it is injected into SOFC2 to continue a new electrochemical reaction. The outlet gas of SOFC1 cathode and the exhaust gas from SOFC2 burn in the afterburner 1. The combustion gas production of the afterburner1 expands in the turbine 1. The outlet gas of SOFC1 anode employs the oxy-fuel combustion mode in the afterburner 2 after H 2 gas is separated. Then, the combustion gas production expands in the turbine 2. To ensure that the flue gas temperature does not exceed the maximum allowed turbine inlet temperature, steam is injected into the afterburner 2. The outlet gas of the afterburner 2 contains all the CO 2 gas of the system. When the steam is removed by condensation, the CO 2 gas can be captured. The steam generated by the waste heat boiler is used to drive a refrigerator and make CO 2 gas liquefied at a lower temperature. The performance of the novel quasi-zero CO 2 emission SOFC/GT hybrid cycle system is analyzed with a case study. The effects of key parameters, such as CO 2 liquefaction temperature, hydrogen separation rate, and the unit oxygen production energy consumption on the new system performance, are investigated. Compared with the other quasi-zero CO 2 emission power systems, the new system has the highest efficiency of around 64.13%. The research achievements will provide the valuable reference for further study of quasi-zero CO 2 emission power system with high efficiency.

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Comparative analysis of hydrogen production systems from biomass based on different absorbent regeneration processes

Cited by 7 publications

References 8 publications

Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification

Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification

Determination of Kinetic and Diffusion Parameters Needed to Predict the Behavior of CaO-Based CO₂ Sorbent and Sorbent-Catalyst Materials

Study on a novel solid oxide fuel cell/gas turbine hybrid cycle system with CO2 capture

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Comparative analysis of hydrogen production systems from biomass based on different absorbent regeneration processes

Cited by 7 publications

References 8 publications

Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification

Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification

Determination of Kinetic and Diffusion Parameters Needed to Predict the Behavior of CaO-Based CO2 Sorbent and Sorbent-Catalyst Materials

Study on a novel solid oxide fuel cell/gas turbine hybrid cycle system with CO2 capture

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Determination of Kinetic and Diffusion Parameters Needed to Predict the Behavior of CaO-Based CO₂ Sorbent and Sorbent-Catalyst Materials