Al2O3 and CeO2-promoted MgO sorbents for CO2 capture at moderate temperatures

doi:10.1007/s11705-017-1691-6

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (1) : 83-93 https://doi.org/10.1007/s11705-017-1691-6

RESEARCH ARTICLE

Al₂O₃ and CeO₂-promoted MgO sorbents for CO₂ capture at moderate temperatures

Huimei Yu^1,^2,³, Xiaoxing Wang¹(

), Zhu Shu², Mamoru Fujii¹, Chunshan Song¹(

)

¹. EMS Energy Institute, PSU-DUT Joint Center for Energy Research, and Department of Energy & Mineral Engineering, Pennsylvania State University, University Park 16802, USA
². Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
³. East China University of Science and Technology, Shanghai 200237, China

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Abstract

A series of Al₂O₃ and CeO₂ modified MgO sorbents was prepared and studied for CO₂ sorption at moderate temperatures. The CO₂ sorption capacity of MgO was enhanced with the addition of either Al₂O₃ or CeO₂. Over Al₂O₃-MgO sorbents, the best capacity of 24.6 mg-CO₂/g-sorbent was attained at 100 °C, which was 61% higher than that of MgO (15.3 mg-CO₂/g-sorbent). The highest capacity of 35.3 mg-CO₂/g-sorbent was obtained over the CeO₂-MgO sorbents at the optimal temperature of 200 °C. Combining with the characterization results, we conclude that the promotion effect on CO₂ sorption with the addition of Al₂O₃ and CeO₂ can be attributed to the increased surface area with reduced MgO crystallite size. Moreover, the addition of CeO₂ increased the basicity of MgO phase, resulting in more increase in the CO₂ capacity than Al₂O₃ promoter. Both the Al₂O₃-MgO and CeO₂-MgO sorbents exhibited better cyclic stability than MgO over the course of fifteen CO₂ sorption-desorption cycles. Compared to Al₂O₃, CeO₂ is more effective for promoting the CO₂ capacity of MgO. To enhance the CO₂ capacity of MgO sorbent, increasing the basicity is more effective than the increase in the surface area.

Keywords CO₂ capture MgO sorbents Al₂O₃ CeO₂ flue gas

Corresponding Author(s): Xiaoxing Wang,Chunshan Song

Just Accepted Date: 30 October 2017 Online First Date: 11 January 2018 Issue Date: 26 February 2018

Cite this article:

Huimei Yu,Xiaoxing Wang,Zhu Shu, et al. Al₂O₃ and CeO₂-promoted MgO sorbents for CO₂ capture at moderate temperatures[J]. Front. Chem. Sci. Eng., 2018, 12(1): 83-93.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-017-1691-6
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I1/83

Tab.1 CO₂ sorption capacity of pure MgO, Al₂O₃, CeO₂ and Al₂O₃- and CeO₂-pormoted MgO sorbents^a)

Fig.1 N₂ adsorption isotherms of (a) pure MgO, (b) Al₂O₃-MgO, (c) Al₂O₃, (d) CeO₂-MgO and (e) CeO₂

Tab.2 The porous properties of MgO, Al₂O₃, CeO₂, Al₂O₃-MgO and CeO₂-MgO

Fig.2 The BJH pore size distribution curves for (a) pure MgO, (b) CeO₂-MgO, (c) CeO₂, (d) Al₂O₃-MgO and (e) Al₂O₃

Fig.3 XRD patterns of (a) pure MgO, (b) Al₂O₃-MgO, (c) Al₂O₃, (d) CeO₂-MgO and (e) CeO₂

Fig.4 SEM and EDS results for (a) pure MgO, (b) Al₂O₃-MgO and (c) CeO₂-MgO

Fig.5 SEM X-ray elemental mapping images of (a) CeO₂-MgO and (b) Al₂O₃-MgO

Fig.6 CO₂-TPD profiles of (a) pure MgO, (b) Al₂O₃-MgO and (c) CeO₂-MgO samples. CO₂ sorption was conducted at 200°C with pure CO₂ flow at 20 mL/min for 20 min

Fig.7 CO₂ uptake measured by CO₂-TPD as a function of sorption temperature over (a) pure MgO, (b) Al₂O₃-MgO and (c) CeO₂-MgO

Fig.8 CO₂ capacity measured by CO₂-TPD as a function of sorption-desorption cycles over (a) pure MgO, (b) Al₂O₃-MgO and (c) CeO₂-MgO

Fig.9 SEM images of (a) spent MgO, (b) spent Al₂O₃-MgO and (c) spent CeO₂-MgO sorbents after 15 cycles of CO₂ sorption-desorption

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