Deactivation of π-Complexation Adsorbents by Hydrogen and Rejuvenation by Oxidation
Abstract
The π-complexation sorbents are the best sorbents for bulk olefin/paraffin separation and purification of normal α-olefins. Hydrogen produced during cracking operations would remain in small or trace amounts in the process streams. The effect of hydrogen exposure on Ag + -exchanged Y zeolite (AgY) and monolayer-dispersed AgNO 3 /SiO 2 (π-complexation sorbents) on olefin adsorption was studied by using accelerated tests. Hydrogen exposure could severely deactivate the π-complexation sorbents for adsorption of ethylene, 1,3-butadiene, and 1-butene. XPS analysis indicated that the Ag + ion responsible for π-complexation was partially reduced, hence, the deactivation. It was found that the deactivated sorbents could be rejuvenated by mild oxidation. The reoxidation of the H 2 -exposed AgY samples were carried out under different oxidation conditions to locate the optimum conditions. The treatment of the H 2 -exposed samples to 0.13 atm of O 2 in He at 350 °C for 0.5 h was the best reoxidation condition achieved in this study.
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Ag and Cu have been the most frequently supported species on zeolitic adsorbents, especially for olefin, hydrogen, and carbon monoxide adsorption.
“In the case of adsorbents, Ag and Cu have been the most frequently supported species, especially for their use in olefin, hydrogen, and carbon monoxide adsorption.”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [155]
Adsorbents containing Ag and Cu may be thermodynamically selective toward olefins via a π-complexation mechanism.
“Adsorbents that contain Ag and Cu, such as supported silicas and aluminas, exchanged zeolites (AgY), and several MOFs, may be thermodynamically selective toward the olefin thanks to a π-complexation mechanism.155,625−627”
From Zeolites in Adsorption Processes: State of the Art and Future Prospects (2022) · cites this paper as [155]
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- Authors
- Jayaraman, A., Yang, R. T., Munson, C. L., & Chinn, D.
- Affiliations
- University of Michigan (US)
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-09-07
- Volume
- 40
- Issue
- 20
- Pages
- 4370-4376
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W1983157750
- Cited by
- 36
- References
- 33
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 2 · 2022: 3 · 2021: 3 · 2019: 3 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 1 · 2012: 2
- FWCI
- 2.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Industrial & Engineering Chemistry Research (publishedVersion)
- Topics
- Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
- Physical Sciences › Chemistry › Spectroscopy › Adsorption, diffusion, and thermodynamic properties of materials
- Physical Sciences › Engineering › Mechanical Engineering › Membrane Separation and Gas Transport
- Keywords
- olefin/paraffin separation, hydrogen exposure, sorbent deactivation, silver ion reduction, ethylene adsorption
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