High Temperature CO2 Capture on Novel Yb2O3-Supported CaO-Based Sorbents

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• 作者：Yingchao Hu ; Wenqiang Liu ; Jian Sun ; Xinwei Yang ; Zijian Zhou ; Yang Zhang ; Minghou Xu
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：August 18, 2016
• 年：2016
• 卷：30
• 期：8
• 页码：6606-6613
• 全文大小：498K
• 年卷期：0
• ISSN：1520-5029

文摘

Incorporation of CaO in inert solid support has been identified as an effective approach to improve the cyclic CO₂ capture performance for CaO-based sorbents. In this work, Yb₂O₃-supported CaO-based sorbents were fabricated via the wet-mixing technique. Elemental dispersion observed by FSEM-EDS showed that the ultrafine active species of CaO particles was finely separated by Yb₂O₃. Different amounts of Yb₂O₃ were introduced and 10−15 wt% was found to be the optimal content range for the support to function as the metal skeleton. In comparison with pure CaO, the improved CO₂ capture performance was observed for CaYb10 over prolonged carbonation-calcination cycles under a severe test condition. This improvement could be ascribed to the enriched macropores within 50–100 nm, which was identified by the N₂ adsorption–desorption analysis. In addition, the microstructure of the synthetic sorbent (analyzed through TEM images) indicated that CaO particles of ∼160 nm were formed with the Yb₂O₃ nanocrystallines (∼15–25 nm) adhered to the surface functioning as physical barriers and as a result, the sintering was effectively retarded. Generally, the enhanced cyclic CO₂ capture performance and the promoted sintering-resistant property of Yb₂O₃-supported CaO-based sorbents made Yb₂O₃ a promising inert solid support.