Self-activation of CaO/Ca3Al2O6 sorbents by thermally pretreated in CO2 atmosphere

Jie-ying Jing, Xue-wei Zhang, Qing Li, Ting-yu Li and Wen-ying Li

Applied Energy, 2018, vol. 220, issue C, 419-425

Abstract: CaO/Ca3Al2O6 sorbents have been proved to be a promising sorbent for CO2 sorption. However, the sorbents still suffer from low CO2 sorption capacity. In this work, self-activation was generated via thermally pretreating CaO/Ca3Al2O6 sorbents in CO2 atmosphere at various temperatures to enhance the CO2 sorption capacity of CaO/Ca3Al2O6 sorbents. Results showed that the thermally pretreated temperature plays an overwhelming role in the CO2 sorption capacity and stability of the CaO/Ca3Al2O6 sorbents. Superior CO2 sorption capacity (8.01 mmol g−1 for C9A1-650 at 500 °C) is achieved, which is 72% higher than that of C9A1 (no pretreatment sample). After 50 carbonation-calcination cycles, the CO2 sorption capacity of C9A1-650 still remained 20% higher than that of C9A1. The high CO2 sorption capacity is ascribed to the smaller CaO grain size (37.1 nm) and the higher surface area (13.1 m2 g−1), resulting from the self-activation process. Meanwhile, the CO2 cyclic sorption stability is due to the small original surface free energy. Furthermore, the C9A1-650 sorbent is employed to use in sorption enhanced methane steam reforming process. It provides a H2 concentration of 98.9% and CH4 conversion of 98.7%, presenting greatly potential in practical application.

Keywords: CaO/Ca3Al2O6; Thermal pretreatment; Self-activation; Sorption capacity; Cyclic sorption stability (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1016/j.apenergy.2018.03.069

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