CIESC Journal ›› 2023, Vol. 74 ›› Issue (10): 4330-4342.DOI: 10.11949/0438-1157.20230584

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Study on the carbon capture performance of highly selective PEI@MOF-808 adsorbent in humid flue gas

Xinqi ZHANG1,2(), Chen ZHANG2, Duoyong ZHANG2, Tao XUAN2, Zhuozhen GAN2, Xuancan ZHU2, Liwei WANG2()   

  1. 1.China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
    2.Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2023-06-19 Revised:2023-09-15 Online:2023-12-22 Published:2023-10-25
  • Contact: Liwei WANG

高选择性PEI@MOF-808吸附剂在潮湿烟气中的碳捕集性能研究

张鑫琦1,2(), 张宸2, 张舵咏2, 宣涛2, 干桌臻2, 朱炫灿2, 王丽伟2()   

  1. 1.上海交通大学中英国际低碳学院,上海 201306
    2.上海交通大学机械与动力工程学院,上海 200240
  • 通讯作者: 王丽伟
  • 作者简介:张鑫琦(1997—),男,硕士研究生,550144979@sjtu.edu.cn
  • 基金资助:
    国家重点研发计划项目(2022YFB4101702)

Abstract:

Zr-based metal organic framework MOF-808 is used as the carrier and is functionalized with polyethylenimine (PEI) to obtain PEI@M-808 composite material, which is used to selectively capture humid flue gas (10% CO2 + 90 % N2 + 10 kPa H2O). The physicochemical properties of the sorbents are characterized by XRD, FT-IR, SEM, and BET techniques, and the effectiveness of the modification scheme is assessed. The sorption performance of PEI300-30@M-808 at trace CO2 with moisture is dramatically enhanced due to the abundant amine groups on the surface of PEI@M-808 corresponding to the loading of PEI molecules. The adsorption performance of the composite adsorbent at trace CO2 concentration is greatly enhanced by the introduction of abundant amine functional groups on the surface of MOF-808 due to the loading of PEI. The PEI300-30@M-808 could trap 0.89 mmol/g at 343 K and 0.1 bar while the MOF-808 manifests sorption capacity of approximately 0.052 mmol/g under the same condition. Furthermore, the sorption selectivity of PEI300-30@M-808 is 5524.65 at 10/90 CO2/N2 at 0.1 bar and 343 K, which is about 56 times larger compared to that of MOF-808. Additionally, per gram of PEI300-30@M-808 could react with 1.47 mmol/g at the sorption condition with 5% RH, indicating that the moisture has a positive effect for CO2 capture with PEI-based materials. After 5 cycles, the CO2 saturated adsorption capacity of PEI300-30@M-808 can still be maintained at 90.7%. Therefore, the PEI300-30@M-808 feature great potential for trace carbon capture in moist flue gas.

Key words: carbon dioxide capture, adsorbents, polyethyleneimine, selectivity, flue gas

摘要:

以Zr基金属有机框架MOF-808为载体,采用聚乙烯亚胺(polyethylenimine, PEI)进行官能化,得到PEI@M-808复合材料,用于选择性捕集潮湿烟气(10% CO2+90% N2+10 kPa H2O)中的低浓度CO2。采用XRD、FT-IR、SEM以及BET等表征了吸附剂的物理化学性质,并评估改性方案的可行性。由于MOF-808表面PEI的负载引入了丰富胺基官能团,使复合吸附剂在低浓度CO2下的吸附性能大幅提升。PEI300-30@M-808在典型烟气温度(343 K)的低压CO2吸附量相比原材料由0.052 mmol/g上升到0.89 mmol/g,增加了约16倍。此外,CO2/N2吸附选择性在0.1 bar(1 bar=105 Pa)时能达到5524.65,相比原材料提升了约56倍。更重要的是,当吸附剂放置到5% RH工况中时吸附量由0.89 mmol/g提高到1.47 mmol/g,证明了水分对其CO2吸附起着良好的促进作用。经过5次循环后,PEI300-30@M-808的CO2饱和吸附量仍可维持在90.7%。

关键词: 二氧化碳捕集, 吸附剂, 聚乙烯亚胺, 选择性, 烟道气

CLC Number: