Granulation mechanism and CO2 capture performance of alkaline metal salt-promoted MgO sorbents

IF 4.5 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Jinbo Song, Jieying Jing, Jinpeng Zhang, Yufeng Xu, Wen-Ying Li
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Abstract

Alkaline metal salt-promoted MgO sorbents are effective for CO2 capture, but they face challenges with decreased CO2 capture performance and powder elutriation in practical applications, arising due to the loss of pore structures and poor mechanical strength of alkaline metal salt-promoted MgO sorbent powder. Herein, granulation technology was employed to resolve the above problem. The optimized alkaline metal salt-promoted MgO sorbent pellets exhibited a CO2 capture capacity of 11.46 mmol·g−1 and a mechanical strength of 11.14 MPa. This mechanical strength was nearly three times greater than that of alkaline metal salt-promoted MgO sorbent pellets without granulation promoters. After 20 cycles, CO2 capture capacity stabilized at 8.71 mmol·g−1, while mechanical strength was maintained at 8.92 MPa. Through characterization, it was revealed that the pore structure generated by the pyrolysis of the granulation promoters notably increased the specific surface area, leading to high CO2 capture capacity. Meanwhile, the strengthened mechanical strength of the alkaline metal salt-promoted MgO sorbent pellets was primarily due to the in situ formation of a γ-AlOOH sol-gel cluster skeleton. Thus, this study provides an effective technological pathway to enhance the performance of the alkaline metal salt-promoted MgO sorbent pellets for industrial applications.

碱金属盐促进MgO吸附剂的造粒机理及CO2捕集性能
碱金属盐促进MgO吸附剂对CO2捕集是有效的,但在实际应用中,由于碱金属盐促进MgO吸附剂粉末的孔隙结构丧失和机械强度差,导致其捕集性能和粉末洗脱性能下降。本文采用造粒技术解决了上述问题。优化后的碱金属盐促进MgO吸附球团的CO2捕集量为11.46 mmol·g−1,机械强度为11.14 MPa。这种机械强度几乎是不含造粒促进剂的碱金属盐促进氧化镁吸附球的3倍。循环20次后,CO2捕集能力稳定在8.71 mmol·g−1,机械强度维持在8.92 MPa。通过表征发现,造粒促进剂热解产生的孔隙结构显著增加了比表面积,从而具有较高的CO2捕集能力。同时,碱性金属盐促进MgO吸附球团的机械强度增强主要是由于γ-AlOOH溶胶-凝胶团簇骨架的原位形成。因此,本研究为提高碱金属盐促进MgO吸附球团的工业应用性能提供了一条有效的技术途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.60
自引率
6.70%
发文量
868
审稿时长
1 months
期刊介绍: Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.
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