Modified CaO-based sorbent looping cycle for CO2 mitigation

Li, Yingjie; Zhao, Changsui; Chen, Huichao; Liang, Cai; Duan, Lunbo; Zhou, Weizheng

doi:10.1016/j.fuel.2008.09.018

Cited by 123 publications

(75 citation statements)

References 24 publications

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“…This loss in capacity is caused by sintering of CaO and CaCO 3 during the adsorption-desorption process, which is particularly detrimental to CaCO 3 because it leads to the aggregation of crystals and a reduction of the surface area and pore volume. To overcome this problem, several methods have been proposed to produce CaO-based sorbents, which include: i) developing a tailored CO 2 sorbent such as CaO from precipitated CaCO 3 , [14,15] ii) improving the porosity of CaO by hydration treatment, [16,17] iii) modifying CaO-based sorbents, [18,19] and iv) synthesizing new CaO-based sorbents. [20,21] Layered double hydroxides (LDHs) are a type of anionic clay of inorganic layered materials and their structural stability is dependent on the temperature and the molar ratio ( , and concluded that Mg-Al-CO 3 had the highest basic site density.…”

Section: Introductionmentioning

confidence: 99%

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO₂ Capture Capacity

Chang

Chen

et al. 2011

ChemSusChem

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We present the design and synthesis of Ca-rich Ca-Al-O oxides, with Ca(2+)/Al(3+) ratios of 1:1, 3:1, 5:1, and 7:1, which were prepared by hydrothermal decomposition of coprecipitated hydrotalcite-like Ca-Al-CO(3) precursors, for high-temperature CO(2) adsorption at 500-700 °C. In situ X-ray diffraction measurements indicate that the coprecipitated, Ca-rich, hydrotalcite-like powders with Ca(2+)/Al(3+) ratios of 5:1 and 7:1 contained Ca(OH)(2) and layered double hydroxide (LDH) phases. Upon annealing, LDH was first destroyed at approximately 200 °C to form an amorphous matrix, and then at 450-550 °C, the Ca(OH)(2) phase was converted into a CaO matrix with incorporated Al(3+) to form a homogeneous solid solution without a disrupted lattice structure. CaO nanocrystals were grown by thermal treatment of the weakly crystalline Ca-Al-O oxide matrix. Thermogravimetric analysis indicates that a CO(2) adsorption capacity of approximately 51 wt. % can be obtained from Ca-rich Ca-Al-O oxides prepared by calcination of 7:1 Ca-Al-CO(3) LDH phases at 600-700 °C. Furthermore, a relatively high CO(2) capture capability can be achieved, even with gas flows containing very low CO(2) concentrations (CO(2)/N(2) = 10 %). Approximately 95.6 % of the initial CO(2) adsorption capacity of the adsorbent is retained after 30 cycles of carbonation-calcination. TEM analysis indicates that carbonation-promoted CaCO(3) formation in the Ca-Al-O oxide matrix at 600 °C, but a subsequent desorption in N(2) at 700 °C, caused the formation CaO nanocrystals of approximately 10 nm. The CaO nanocrystals are widely distributed in the weakly crystalline Ca-Al-O oxide matrix and are present during the carbonation-calcination cycles. This demonstrates that Ca-Al-O sorbents that developed through the synthesis and calcination of Ca-rich Ca-Al LDH phases are suitable for long-term cyclic operation in severe temperature environments.

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Section: Introductionmentioning

confidence: 99%

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO₂ Capture Capacity

Chang

Chen

et al. 2011

ChemSusChem

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“…The rate (k c ) of this reaction has Unauthenticated Download Date | 5/11/18 10:00 PM been determined by equation (3). Above a degree of conversion of 0.6, the reaction rate drops because of the diffusion process.…”

Section: 28mentioning

confidence: 99%

Studies on the carbonation of Czatkowice limestone in Calcium Looping process

Tomaszewicz

Kotyczka-Morańska

Plis

2016

Polish Journal of Chemical Technology

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The growing demand for the reduction of anthropogenic CO 2 emissions has stimulated the development of CO 2 capture methods. One of the best capture methods comprises the calcium looping process, which incorporates calcium-based sorbents during the calcination and carbonation cycles. Czatkowice limestone may be considered to be a prospective chemical sorbent for the calcium looping process because of its formation characteristics. This paper addresses the thermogravimetric studies conducted under varying conditions of temperature and various concentrations of CO 2 during the carbonation cycles. Moreover, a kinetic analysis of the carbonation stage was performed for the calcined sample at varying temperatures. The kinetic parameters for calcination and diffusion were determined. In addition, there was an increase in the concentration of CO 2 with an increased carbonation conversion. The research results demonstrate that in further cycles of carbonation/calcination, the calcium sorbent reaches a higher rate of carbonation conversion with increased levels of CO 2 .

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“…Much current and promising research involves the investigation of a number of different methods either to reduce the rate of decay in reactivity, to boost the long-term reactivity of the sorbent, or to reactivate the sorbent [13][14][15][16][17][18][19][20]. Silaban et al [21], Lu et al [22,23], Liu et al [24], Sultan et al [25], and this group [26][27][28] all agree that calcium acetate produced by modifying calcium-based sorbent with acetic acid solution is an excellent CO 2 sorbent which retains high reactivity during the longterm cycles. Although the acetic acid is expensive, it can be replaced by the industrial wastes with acetic acid.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the cost of CO 2 sorbent will be reduced further [26,29]. Consequently, in this paper, the focus is on the simulation analysis of CO 2 capture efficiency and system net efficiency for IGCC power plant using modified calcium-based sorbent, incorporating a fresh feed of sorbent to compensate for the decay in activity during long-term cycles by the software package, Aspen Plus.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Simulation of CO₂ Capture for an IGCC Power Plant using the Calcium Looping Cycle

Zhao

Ren

2011

Chem Eng & Technol

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A CO 2 capture process for an integrated gasification combined cycle (IGCC) power plant using the calcium looping cycle was proposed. The CO 2 capture process using natural and modified limestone was simulated and investigated with the software package Aspen Plus. It incorporated a fresh feed of sorbent to compensate for the decay in CO 2 capture activity during long-term cycles. The sorbent flow ratios have significant effect on the CO 2 capture efficiency and net efficiency of the CO 2 capture system. The IGCC power plant, using the modified limestone, exhibits higher CO 2 capture efficiency than that using the natural limetone at the same sorbent flow ratios. The system net efficiency using the natural and modified limestones achieves 41.7 % and 43.1 %, respectively, at the CO 2 capture efficiency of 90 % without the effect of sulfation.

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Modified CaO-based sorbent looping cycle for CO2 mitigation

Cited by 123 publications

References 24 publications

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO₂ Capture Capacity

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO₂ Capture Capacity

Studies on the carbonation of Czatkowice limestone in Calcium Looping process

Thermodynamic Simulation of CO₂ Capture for an IGCC Power Plant using the Calcium Looping Cycle

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Modified CaO-based sorbent looping cycle for CO2 mitigation

Cited by 123 publications

References 24 publications

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO2 Capture Capacity

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO2 Capture Capacity

Studies on the carbonation of Czatkowice limestone in Calcium Looping process

Thermodynamic Simulation of CO2 Capture for an IGCC Power Plant using the Calcium Looping Cycle

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Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO₂ Capture Capacity

Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO₂ Capture Capacity

Thermodynamic Simulation of CO₂ Capture for an IGCC Power Plant using the Calcium Looping Cycle