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Using silver exchange to achieve high uptake and selectivity for propylene/ propane separation in zeolite Y

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Title: Using silver exchange to achieve high uptake and selectivity for propylene/ propane separation in zeolite Y
Authors: Xiong, Y
Tian, T
L'Hermitte, A
Mendez, ASJ
Danaci, D
Platero-Prats, AE
Petit, C
Item Type: Journal Article
Abstract: Adsorptive separation of propylene and propane, an important step of polypropylene production, is more energy-efficient than distillation. However, the challenge lies in the design of an adsorbent which exhibits both high selectivity and uptake. Herein, we hypothesise that enhancing the propylene affinity of the adsorption sites while keeping a suitable pore size can address this challenge. To do so, we performed silver exchange of a commercial zeolite Y, thereby making the adsorbent design easily scalable. We characterised the adsorbent using analytical, spectroscopic and imaging tools, tested its equilibrium and dynamic sorption properties using volumetric and gravimetric techniques and compared its performance to those of state-of-the-art adsorbents as well as other silver-functionalised adsorbents. The silver-exchanged zeolite Y (Ag-Y) exhibited one of the best selectivity vs uptake performances reported so far. Ag-Y also displayed fast adsorption kinetics and reversible propylene sorption, making it a promising new benchmark for propylene/propane separation. Synchrotron-based pair distribution function analyses identified the silver cations’ location which confirmed that the silver sites are easily accessible to the adsorbates. This aspect can, in part, explain the propylene/propane separation performance observed. The overall design strategy proposed here to enhance sorption site affinity and maintain pore size could be extended to other adsorbents and support the deployment of adsorption technology for propylene/propane separation.
Issue Date: 15-Oct-2022
Date of Acceptance: 18-May-2022
URI: http://hdl.handle.net/10044/1/97789
DOI: 10.1016/j.cej.2022.137104
ISSN: 1385-8947
Publisher: Elsevier
Journal / Book Title: Chemical Engineering Journal
Volume: 446
Copyright Statement: © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by- nc-nd/4.0/).
Sponsor/Funder: BP International Limited
Engineering & Physical Science Research Council (E
Engineering and Physical Sciences Research Council
Funder's Grant Number: BP Proj Ref 75195(24)ICAM24
RG/150258
EP/S023259/1
Keywords: Science & Technology
Technology
Engineering, Environmental
Engineering, Chemical
Engineering
Propylene
propane separation
Silver exchange
Ag-Y
Propylene uptake
Propylene selectivity
METAL-ORGANIC FRAMEWORKS
PI-COMPLEXATION
OLEFIN/PARAFFIN SEPARATIONS
EFFICIENT SEPARATION
KINETIC SEPARATION
ADSORPTION
SORBENTS
PROPENE
SITES
ADSORBENTS
Science & Technology
Technology
Engineering, Environmental
Engineering, Chemical
Engineering
Propylene
propane separation
Silver exchange
Ag-Y
Propylene uptake
Propylene selectivity
METAL-ORGANIC FRAMEWORKS
PI-COMPLEXATION
OLEFIN/PARAFFIN SEPARATIONS
EFFICIENT SEPARATION
KINETIC SEPARATION
ADSORPTION
SORBENTS
PROPENE
SITES
ADSORBENTS
Chemical Engineering
0904 Chemical Engineering
0905 Civil Engineering
0907 Environmental Engineering
Publication Status: Published
Article Number: ARTN 137104
Appears in Collections:Chemical Engineering
Faculty of Engineering



This item is licensed under a Creative Commons License Creative Commons