Cited by 36Zeolite Catalysis and SynthesisAdsorption, diffusion, and thermodynamic properties of materialsMembrane Separation and Gas Transport

Deactivation of π-Complexation Adsorbents by Hydrogen and Rejuvenation by Oxidation

Jayaraman, Ambalavanan, Yang, Ralph T., Munson, Curtis L., Chinn, Daniel·2001·Industrial & Engineering Chemistry Research

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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Crossref · 10.1021/ie0102753

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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.”
  • 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”

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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
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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