Exploring periodic mesoporous organosilicas for ethane-ethylene adsorption-separation
authors Bordonhos, M; Lourenco, M; Gomes, JRB; Ferreira, P; Pinto, ML
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords Periodic mesoporous organosilicas; Silylation; Adsorption; Ethane?ethylene separation
keywords METAL-ORGANIC FRAMEWORK; PREFERENTIAL ADSORPTION; SELECTIVE ADSORPTION; PILLARED CLAYS; ADSORBENTS; SILICA; FUNCTIONALIZATION; IRMOF-8; OLEFINS; DESIGN
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.
publisher ELSEVIER
issn 1387-1811
isbn 1873-3093
year published 2021
volume 317
digital object identifier (doi) 10.1016/j.micromeso.2021.110975
web of science category 10
subject category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
unique article identifier WOS:000634774700002
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