Experimental study on CO2 capture mechanisms using Na2ZrO3 sorbents synthesized by soft chemistry method

Ji, Guozhao; Memon, Muhammad Zaki; Zhuo, Haoran; Zhao, Ming

doi:10.1016/j.cej.2016.12.103

Cited by 53 publications

(21 citation statements)

References 38 publications

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“…13a and 13b focus on the details of CO 2 sorption kinetics for the 1 st cycle and 15 th cycle of the two sorbents. The sorption rate, which is calculated as the first order derivative of CO 2 uptake variation with respect to time, was also plotted as dashed lines to allow the analysis of reaction mechanisms [55]. As shown in Fig.…”

Section: Effect Of Co 2 Partial Pressurementioning

confidence: 99%

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Zhao

et al. 2018

Chemical Engineering Journal

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A series of mesoporous MgO samples with different morphologies were synthesized through a simple hydrothermal treatment and NaNO 3 /NaNO 2 were used as promoters to enhance CO 2 capture capacity at an intermediate temperature range (200-400 °C). The effects of hydrothermal solution pH and content of promoters were examined to determine the optimal synthesis conditions. The influence of operational temperatures, CO 2 partial pressure, and performance over repeated cycles was investigated and the reaction mechanism was discussed. The mesoporous MgO promoted by NaNO 3 /NaNO 2 exhibited a CO 2 capture capacity as high as 19.8 mmol•g-1 at 350 °C in the presence of 0.85 bar of CO 2 within only 50 min. A "three-stage" reaction process was proposed based on a detailed sorption kinetics study, namely Stage I: initiating interactions between CO 2 and exposed MgO; Stage II: generation and accumulation of Mg 2+ and CO 3 2-; and Stage III: fast carbonation. Gradual deterioration of sorbents was found over the first 5 cycles followed by stable regenerability in the 5-15 th cycles. A kinetic study of the 15 th cycle suggests that the deactivation of sorbents inhibited the accumulation of Mg 2+ and CO 3 2in Stage II and suppressed the carbonation in Stage III. A range of characterizations were undertaken revealing the morphology and structure of both fresh and regenerated sorbents. The results confirmed that, other than the sintering effect due to phase transition, the transformation of MgO skeleton is also an important contributor to the gradual deactivation of the sorbents over the first 5 cycles. More severe sintering effect under harsh decarbonation conditions suppressed the stability of the sorbents over cycles.

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Section: Effect Of Co 2 Partial Pressurementioning

confidence: 99%

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Zhao

et al. 2018

Chemical Engineering Journal

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“…Multicycle performance in 50 % CO 2 up to 11 cycles indicated an uptake of almost 15 wt % . Sodium oxalate and zirconium nitrate, sodium citrate and zirconyly nitrate aqueous solutions as well as sodium acetate and zirconyl chloride solutions have been used to produce Na 2 ZrO 3 in an evaporation/drying/calcination process reported by Ji et al . and Memon et al …”

Section: Resultsmentioning

confidence: 94%

Spray‐Dried Sodium Zirconate: A Rapid Absorption Powder for CO₂ Capture with Enhanced Cyclic Stability

Bamiduro

Brown

et al. 2017

ChemSusChem

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Improved powders for capturing CO2 at high temperatures are required for H2 production using sorption‐enhanced steam reforming. Here, we examine the relationship between particle structure and carbonation rate for two types of Na2ZrO3 powders. Hollow spray‐dried microgranules with a wall thickness of 100–300 nm corresponding to the dimensions of the primary acetate‐derived particles gave about 75 wt % theoretical CO2 conversion after a process‐relevant 5 min exposure to 15 vol % CO2. A conventional powder prepared by solid‐state reaction carbonated more slowly, achieving only 50 % conversion owing to a greater proportion of the reaction requiring bulk diffusion through the densely agglomerated particles. The hollow granular structure of the spray‐dried powder was retained postcarbonation but chemical segregation resulted in islands of an amorphous Na‐rich phase (Na2CO3) within a crystalline ZrO2 particle matrix. Despite this phase separation, the reverse reaction to re‐form Na2ZrO3 could be achieved by heating each powder to 900 °C in N2 (no dwell time). This resulted in a very stable multicycle performance in 40 cycle tests using thermogravimetric analysis for both powders. Kinetic analysis of thermogravimetric data showed the carbonation process fits an Avrami–Erofeyev 2 D nucleation and nuclei growth model, consistent with microstructural evidence of a surface‐driven transformation. Thus, we demonstrate that spray drying is a viable processing route to enhance the carbon capture performance of Na2ZrO3 powder.

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“…Na 2 SiO 3 + NaOH, 133 Na 2 CO 3 + ZrO 2 , 134 and Na 2 CO 3 + CoCO 3 132 , as well as by wet-chemistry methods such as sol-gel synthesis. 135,136 Na 4 SiO 4 was found to perform well above 750 °C, showing a maximum uptake of 19.2 wt.% (80.3 mol%, with a stoichiometric uptake capacity of 23.9 wt.%) at 840 °C. 133 One approach to improve the low-temperatures performance of Na 4 SiO 4 is doping alkali carbonates (M 2 CO 3 , M=Li, Na, K), which promotes the diffusion of O 2 − through the molten carbonate layer.…”

Section: 2mentioning

confidence: 97%

Synthetic solid oxide sorbents for CO₂ capture: state-of-the art and future perspectives

Chang

Cheung

et al. 2022

J. Mater. Chem. A

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Experimental study on CO2 capture mechanisms using Na2ZrO3 sorbents synthesized by soft chemistry method

Cited by 53 publications

References 38 publications

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Spray‐Dried Sodium Zirconate: A Rapid Absorption Powder for CO₂ Capture with Enhanced Cyclic Stability

Synthetic solid oxide sorbents for CO₂ capture: state-of-the art and future perspectives

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Experimental study on CO2 capture mechanisms using Na2ZrO3 sorbents synthesized by soft chemistry method

Cited by 53 publications

References 38 publications

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Mesoporous MgO promoted with NaNO3/NaNO2 for rapid and high-capacity CO2 capture at moderate temperatures

Spray‐Dried Sodium Zirconate: A Rapid Absorption Powder for CO2 Capture with Enhanced Cyclic Stability

Synthetic solid oxide sorbents for CO2 capture: state-of-the art and future perspectives

Contact Info

Product

Resources

About

Spray‐Dried Sodium Zirconate: A Rapid Absorption Powder for CO₂ Capture with Enhanced Cyclic Stability

Synthetic solid oxide sorbents for CO₂ capture: state-of-the art and future perspectives