Skip to Main content Skip to Navigation
Journal articles

Novel hydroquinone-alumina composites stabilizing a guest-free clathrate structure: applications in gas processing

Abstract : Organic clathrates formed by hydroquinone (HQ) and gases such as CO2 and CH4 are solid supramolecular host–guest compounds in which the gaseous guest molecules are encaged in a host framework of HQ molecules. Not only are these inclusion compounds fascinating scientific curiosities but they can also be used in practical applications such as gas separation. However, the development and future use of clathrate-based processes will largely depend on the effectiveness of the reactive materials used. These materials should enable fast and selective enclathration and have a large gas storage capacity. This article discusses the properties and performance of a new composite material able to form gas clathrates with hydroquinone (HQ) deposited on alumina particles. Apart from the general characterization of the HQ-alumina composite, one of the most remarkable observations is the unexpected formation of a guest-free clathrate structure with long-term stability (>2 years) inside the composite. Interestingly enough, in addition to a slight improvement in the enclathration kinetics of pure CO2 compared to powdered HQ, preferential capture of CO2 molecules is observed when the HQ-alumina composite is exposed to an equimolar CO2/CH4 gas mixture. In terms of gas capture selectivity toward CO2, the performance of this new composite exceeds that of pure HQ and HQ-silica composites developed in a previous study, opening up new opportunities for the design and use of these novel materials for gas separation.
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-02910839
Contributor : Peter Moonen <>
Submitted on : Friday, November 20, 2020 - 11:57:25 AM
Last modification on : Friday, January 15, 2021 - 9:22:28 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2021-07-07

Please log in to resquest access to the document

Identifiers

Citation

Romuald Coupan, Peter Moonen, Christophe Dicharry, Frédéric Plantier, Joseph Diaz, et al.. Novel hydroquinone-alumina composites stabilizing a guest-free clathrate structure: applications in gas processing. ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2020, 12 (30), pp.34137-34147. ⟨10.1021/acsami.0c06187⟩. ⟨hal-02910839⟩

Share

Metrics

Record views

40