Citation: Chen Yang, Du Yadan, Wang Yong, Liu Puxu, Li Libo, Li Jinping. Ammonia Modification on UTSA-280 for C₂H₄/C₂H₆ Separation[J]. Acta Chimica Sinica, ;2020, 78(6): 534-539. doi: 10.6023/A20040130 shu

Ammonia Modification on UTSA-280 for C₂H₄/C₂H₆ Separation

Chen Yang ^a ,
Du Yadan ^a ,
Wang Yong ^a ,
Liu Puxu ^a ,
Li Libo ^a,b,, ,
Li Jinping ^a,b

a.
College of Chemistry and Chemical Engineering, Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan 030024
b.
Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024

Corresponding author: Li Libo, lilibo908@hotmail.com
Received Date: 29 April 2020
Available Online: 24 May 2020
Fund Project: Natural Science Foundation for Young Scientists of Shanxi Province 201901D211053the National Natural Science Foundation of China 21908155the National Natural Science Foundation of China 21922810Project supported by the National Natural Science Foundation of China (Nos. 21908155, 21922810), Natural Science Foundation for Young Scientists of Shanxi Province (No. 201901D211053) and the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi

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Recovering C₂H₄ from refinery gas is an effective way to broaden the source of ethylene. However, it's a challenging task to separate C₂H₄ and C₂H₆ due to their very close physical properties and molecular size. Metal-organic frameworks (MOFs) are shown broad prospects in the field of light hydrocarbon separation in recent years. In this work, NH₃ is used to modify the structure of UTSA-280, the efficient separation of C₂H₄/C₂H₆ can be achieved through the adjustment of one-dimensional channels. UTSA-280 has undergone stepwise adsorption of ammonia gas at 298 K and 100 kPa. After partial ammonia removal, we obtained the modified UTSA-280 that ammonia adsorption modification with a mass loading of 5.6% for UTSA-280-M1 and 2.8% for UTSA-280-M2. The NH₃ modified UTSA-280 shows a unique ultramicroporous structure that can enhance the adsorption of C₂H₄ and does not adsorb the slightly larger C₂H₆, achieving the ideal C₂H₄/C₂H₆ adsorption selectivity (more than 1000). Ammonia molecules play the role of perfectly adjusting the size of one-dimensional channels and realize the ideal screening effect of C₂H₄/C₂H₆. The C₂H₄ adsorption capacity of NH₃ modified UTSA-280-M2 can be improved to 2.83 mmol/g at 298 K and 100 kPa (an increase of 29% compared with initial material). And its ultramicroporous structure can fully block the adsorption of C₂H₆, which finally achieves a C₂H₄/C₂H₆ selectivity over 1200. Grand Canonical Monte Carlo (GCMC) simulation of C₂H₄/C₂H₆ mixed gases (equal volume) adsorption results showed that the modified UTSA-280 had more C₂H₄ adsorption distribution in the mixed components than C₂H₆. Through the C₂H₄/C₂H₆ mixed gases breakthrough test at 298 K, NH₃ modified UTSA-280-M2 shows a separation time of more than 48 min, which is more than the initial 25 min. Compared with the unmodified material, the separation performance is nearly doubled. Scalable synthesis, stable structure, and the advantages of controllable performance after ammonia modification have prompted this material to have great prospects in the industrialization of C₂H₄/C₂H₆ separation.
- metal-organic frameworks,
- NH₃ modification,
- C₂H₄/C₂H₆ separation,
- selectivity
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Ammonia Modification on UTSA-280 for C₂H₄/C₂H₆ Separation