Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/35731
Title: Exploring periodic mesoporous organosilicas for ethane–ethylene adsorption–separation
Author: Bordonhos, Marta
Lourenço, Mirtha
Gomes, José R. B.
Ferreira, Paula
Pinto, Moisés L.
Keywords: Periodic mesoporous organosilicas
Silylation
Adsorption
Ethane–ethylene separation
Issue Date: Apr-2021
Publisher: Elsevier
Abstract: Ethylene is a core building block in the chemical industry and its separation from ethane is very challenging due to high energy requirements. Adsorption-based processes can be an alternative to current processes based on cryogenic distillation. In this work, we explore for the first time the application of periodic mesoporous organosilica (PMO) materials, whose surface properties can be tuned with different functional groups. With the aim of correlating the PMO structure with ethane and ethylene adsorption, eight different PMO materials have been prepared, viz. the phenylene-bridged PMO, PMO aminated at the organic bridges, and PMO functionalized by silylation of free silanol (inorganic) moieties. High pressure adsorption isotherms were measured, and the separation selectivity and phase diagrams of a binary mixture of ethane and ethylene were estimated. Results have shown that, overall, the PMO studied tend to be more selective towards ethylene than ethane probably due to the interactions between the quadrupole moment of ethylene and the free silanols in the samples. After silylation, the novel materials presented surfaces with higher affinity towards ethane than those of the pristine material. For the aminated samples, functionalization with primary amines originated materials displaying better selectivity towards ethylene than those functionalized with secondary or tertiary amines.
Peer review: yes
URI: http://hdl.handle.net/10773/35731
DOI: 10.1016/j.micromeso.2021.110975
ISSN: 1387-1811
Publisher Version: https://www.sciencedirect.com/science/article/pii/S1387181121001013
Appears in Collections:CICECO - Artigos

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