Enhancement in cyclic stability of the CO2 adsorption capacity of CaO-based sorbents by hydration for the calcium looping cycle

Li, Chien Cheng; Cheng, Jui Yen; Liu, Wan Hsia; Huang, C.M.; Hsu, Heng Wen; Lin, Hong Ping

doi:10.1016/j.jtice.2013.06.019

Cited by 19 publications

(13 citation statements)

References 29 publications

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“…At present, the main post combustion CO 2 capture technologies include: absorption, adsorption, membrane separation and cryogenic fractionation [4]. Although current commercial technologies such as amine based scrubbing are available for CO 2 capture from flue gas, the capital and operating cost of capture is still too high [5][6][7][8]. This has become a major barrier for the application of CO 2 capture in power plant sectors and other CO 2 emitters.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a novel cryogenic CO2 capture process by response surface methodology (RSM)

Song

Kitamura

2014

Journal of the Taiwan Institute of Chemical Engineers

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sCO 2 capture and storage (CCS) technologies play a significant role in greenhouse gas (GHG) control. In our previous work, a novel cryogenic CO 2 capture process based on free piston Stirling coolers (FPSCs) was developed. In order to improve capture efficiency, the exploited system was optimized using response surface methodology (RSM). The influence of capture conditions on performance was investigated based on three levels and variables and in central composite design (CCD). The parameters contain flow rate (X 1 : 1 ~ 3 L/min), temperature of FPSC-1 (X 2 : -30 ~ -10 °C) and idle operating time (X 3 : 3 ~ 5 h). The objective of this work is to ascertain the optimal performance of the system (with maximum CO 2 recovery, CO 2 productivity and minimum energy consumption). The experimental data was fitted to a second-order polynomial equation using multiple regression analysis and analyzed using analysis of variance (ANOVA). The dimensional response surface plots and the contour plots derived from the mathematical models were utilized to determine optimum conditions. Results indicate the optimum conditions were: flow rate of 2.16 L/min, temperature of FPSC-1 of -18 °C and operating time of 3.9 h.Under these conditions, the whole process can capture 95.20 % CO 2 with 0.52 MJ/kg captured CO 2 input electricity. Meanwhile, the CO 2 productivity is 44.37 kg CO 2 /h. Nomenclature X1Flow rate of flue gas, L/min X2 Temperature of FPSC-1, °C X3 Idle operating time, h η CO 2 recovery φ CO 2 productivity Abbreviations ANOVA Analysis of variance CCD Central composite design CCS CO 2 capture and storage CFZ Controlled freeze zone EC Energy consumption FPSC Free piston Stirling cooler GHG Greenhouse gas RSM Response surface methodology TPSA Temperature pressure swing adsorption 4

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Section: Introductionmentioning

confidence: 99%

Optimization of a novel cryogenic CO2 capture process by response surface methodology (RSM)

Song

Kitamura

2014

Journal of the Taiwan Institute of Chemical Engineers

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“…The surface area and pore volume of all natural CaO-based sorbents is presented in Table 42.2. Hydration of the calcined sample leads to an increase in surface area and porosity compared to Ca (OH) 2 -C900 sample (Li et al 2014). Concerning the mixed materials, the nature of the binder seems to affect the textural properties of the final sorbent.…”

Section: Physicochemical Characterizationmentioning

confidence: 98%

“…Steam, which is anyway present in flue gases, is reported to enhance sorption capacity (Manovic and Anthony 2010;Kavosh et al 2014), whereas no positive effect was reported in other studies (Sun et al 2008). Steam has been also used for regeneration attempts of the sorbents, usually via the incorporation of a hydration step in the calcium looping cycle (Sun et al 2008;Li et al 2014;Coppola et al 2014).…”

Section: Modelingmentioning

confidence: 99%

“…According to the thermodynamic equilibrium curve for CaO hydration, calcium oxide is hydrated to calcium hydroxide at temperatures lower than 400 C. The reaction is accompanied by an increase in specific volume, from 16.9 cm 3 /mol for CaO 33.1 cm 3 /mol for Ca(OH) 2 , Fig. 42.10 Carbonation profiles for the 1st cycle for (a) Ca(OH) 2 -C900 (GHSV ¼ 286.5 h À1 ) and (b) Ca(OH) 2 -MgO-GM (B) (GHSV ¼ 427 h À1 ) natural sorbents ultimately resulting to an increase in surface area and porosity (Li et al 2014). As shown in Fig.…”

Section: Bench-scale Testing In a Fixed Bed Reactormentioning

confidence: 99%

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Energy, Transportation and Global Warming

Grammelis¹

2016

Green Energy and Technology

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“…Ca-, Mg-and Li-based solid sorbents are highly impressive sorbents in CO 2 sorption process. However, Ca-based sorbents are more interesting because of its high CO 2 sorption capacity (0.786 g of CO 2 /g of sorbent), resistivity of coke rein, stability in long term cyclic operation, low cost and wide availability [28][29][30][31]. The exothermic carbonation reaction between calcium oxide and CO 2 is performed as shown in Equation (6).…”

Section: Introductionmentioning

confidence: 99%

Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

et al. 2017

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Abstract:In this study, the application of a calcium-based bifunctional catalyst/sorbent is investigated in modified chemical looping steam methane reforming (CLSMR) process for in situ CO 2 sorption and H 2 production. The yttrium promoted Ca-Co samples were synthesized and applied as bifunctional catalysts/sorbent. The influence of reduction temperature (500-750 • C), Ca/Co and Ca/Y ratios (1.5-∞ and 3-18, respectively) and catalyst life time are determined in CLSMR process. The physicochemical transformation of fresh, used and regenerated samples after 16 redox cycles are determined using X-ray powder diffraction (XRD), N 2 adsorption-desorption, field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) techniques. The effect of yttrium promoter on the structure of catalyst and regeneration step on the reversibility of bifunctional catalyst/sorbent was two important factors. The characterization results revealed that the presence of yttrium in the structure of Ca-9Co sample could improve the morphology and textural properties of catalyst/sorbents. The suitable reversibility of bifunctional catalyst/sorbents during the repeated cycles is confirmed by characterization of calcined samples. The Ca-9Co-4.5Y as optimal catalyst illustrated superior performance and stability. It showed about 95.8% methane conversion and 82.9% hydrogen yield at 700 • C and stable activity during 16 redox cycles.

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Enhancement in cyclic stability of the CO2 adsorption capacity of CaO-based sorbents by hydration for the calcium looping cycle

Cited by 19 publications

References 29 publications

Optimization of a novel cryogenic CO2 capture process by response surface methodology (RSM)

Optimization of a novel cryogenic CO2 capture process by response surface methodology (RSM)

Energy, Transportation and Global Warming

Promotion of Ca-Co Bifunctional Catalyst/Sorbent with Yttrium for Hydrogen Production in Modified Chemical Looping Steam Methane Reforming Process

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