期刊
CHEMICAL ENGINEERING SCIENCE
卷 74, 期 -, 页码 172-180出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2012.02.042
关键词
CaO-based sorbent; CO2 capture; Absorption; Morphology; Stability; Environment
资金
- Fundamental Research Funds for the Central Universities of China [WA1014003]
- State Key Laboratory of Chemical Engineering [SKL-ChE-10C06]
- 111 Project [B08021]
CaO-based CO2 sorbents derived from various calcium and aluminum precursors were prepared by a wet mixing method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and N-2 adsorption-desorption techniques. The as-prepared sorbents consisted of active CaO and inert support materials that could be Al2O3, Ca12Al14O33 or Ca9Al6O18, depending on calcium and aluminum precursors used during the preparation process. A formation mechanism for the inert support materials was proposed. Compared to pure CaO, most of the synthetic CaO-based sorbents showed much higher CO2 capture capability and stability over multiple carbonation/calcination cycles, which was ascribed to the relatively high specific surface area of the sorbents, the bimodal pore-size distribution with a fair number of small pores, and the inert support material that can effectively prevent or delay sintering of CaO particles. Among these synthetic sorbents the CaO-Ca9Al6O18 sorbent with a CaO content of 80 wt% (weight fraction) derived from calcium citrate and aluminum nitrate exhibited the best performance for CO2 capture, and can be expected to be applied in the sorption-enhanced steam methane reforming process. (C) 2012 Elsevier Ltd. All rights reserved.
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