Abstract
Magnetic induction has emerged as a viable method for regeneration of sorbents during separation processes. In this work, we investigated the efficacy of magnetic sorbents comprising iron oxide and zeolite 13X in ethylene/ethane separation via a magnetic induction process. The electromagnetic properties of the sorbents were tuned by varying the iron oxide (Fe2O3) particle size (30 nm, 100 nm, 5 μm) and iron oxide phase structure (FeO, Fe2O3, Fe3O4) at 20 wt % loading. The effects of these parameters on adsorption capacity, selectivity, and desorption rates were systematically investigated. The microporosity and surface area of magnetic sorbents were reduced by increasing the particle size of Fe2O3 from 30 nm to 5 μm. The results indicated that regardless of iron oxide particle size or phase structure, the C2H4/C2H6selectivity ranges between 2.44 and 2.65 for all the magnetic sorbents. The specific heat absorption rate (SAR) was increased by ∼60% upon increasing the magnetic field intensity from 21.4 to 31.4 mT when the particle size increased from 30 nm to 5 μm. Fe3O4 was found to outperform the other phases by exhibiting 91.3 and 93.3% higher SAR than Fe2O3and FeO at 31.4 mT, respectively, owing to its unique lattice structure with dual ion states (Fe2+and Fe3+). Fe3O4/13X exhibited an ethylene desorption rate of 0.41 mmol/g·min at 21.4 mT, which was 58.5% faster than that under conventional thermal heating. Additionally, the sorbent was found to be highly durable, maintaining its adsorption and desorption capabilities over five consecutive cycles in the magnetic induction swing adsorption (MISA) process, conducted at 25 °C and 1 bar during adsorption and at 31.4 mT during desorption. These results indicate the potential of Fe3O4/13X as an effective magnetic sorbent in the MISA process. This study builds on our previous proof-of-concept work on the potential of magnetic sorbents as stimuli-responsive materials for light olefin/paraffin separation.
Recommended Citation
K. Baamran et al., "Magnetic-Induced Swing Adsorption Over Iron Oxide/13X: Effects Of Particle Size And Oxide Phase On Sorbent Regeneration In Ethylene/Ethane Separation," ACS Sustainable Chemistry and Engineering, vol. 11, no. 23, pp. 8603 - 8614, American Chemical Society, Jun 2023.
The definitive version is available at https://doi.org/10.1021/acssuschemeng.3c01468
Department(s)
Chemical and Biochemical Engineering
Keywords and Phrases
13X; C H /C H separation 2 4 2 6; Fe O 3 4; induction heating; magnetic sorbent
International Standard Serial Number (ISSN)
2168-0485
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2023 American Chemical Society, All rights reserved.
Publication Date
12 Jun 2023
Comments
National Science Foundation, Grant CBET-2019350