Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 31, Pages 26618-26627Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b07294
Keywords
polyimide; microporous organic polymer; CO2 capture; light hydrocarbon; adsorption; separation
Funding
- National Science Foundation of China [51473026, U1462125]
- Fundamental Research Funds for the Central Universities [DUT18GF107]
Ask authors/readers for more resources
Ultramicroporous semicycloaliphatic polyimides with major pore sizes less than 0.5 nm are synthesized through imidization reaction between different aromatic tetraamines and cycloaliphatic dianhydrides. The synergistic role of abundant CO2-philic imide rings and the molecular sieving effect of ultrasmall pores in the polyimide network bring about high adsorption selectivity of CO2/CH4 (37.2) and CO2/N-2 (136.7). In addition, it is interesting to observe that, under ambient condition (298 K/1 bar), n-butane exhibits the highest uptake (3.15 mmol/g) among the C-1-C-4 alkanes, and the adsorbed amount significantly drops with the reduction of the number of carbon atoms. As a result, the mixed light alkanes can be effectively separated according to the carbon numbers. The separation factors of n-butane/propane and propane/ethane reach 3.1 and 6.5, whereas those of n -butane, propane, and ethane over methane are as high as 414.5, 217.4, and 19.6, respectively. Moreover, the polyimides display large adsorption capacities for 1,3-butadiene (4.64 mmol/g) and propene (2.68 mmol/g) with good selectivity over 1-butene and propane of 3.2 and 3.0, respectively. Together with the excellent thermal and physicochemical stabilities, the ultramicroporous polyimides obtained in this work show promising applications in adsorption/separation for CO2, CH4, and C-2-C-4 hydrocarbons.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available