Amine‐functionalized mesoporous silica: A material capable of CO2 adsorption and fast regeneration by microwave heating. Issue 2 (15th December 2015)

• Record Type: Journal Article
• Authors: Nigar, Hakan; Garcia‐Baños, Beatriz; Peñaranda‐Foix, Felipe L.; Catalá‐Civera, Jose M.; Mallada, Reyes; Santamaría, Jesus
• Is Part Of: AIChE journal. Volume 62:Issue 2(2016)
• Page Start: 547
• Page End: 555
• Publication Date: 2015-12-15
• Subjects: adsorption/gas -- microwave heating -- mesoporous silica -- amine functionalization -- dielectric measurements; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.15118
• Languages: English
• ISSNs: 0001-1541

Abstract

Abstract : The surface of ordered mesoporous (MCM‐48) silica has been subjected to covalent grafting with silane molecules containing one to three amino groups. The dielectric properties of the materials were studied in detail, and the functionalized materials were used for CO2 adsorption at room temperature, followed by regeneration under either conventional heating or microwave irradiation. It has been found that, as the intensity of functionalization with amino groups increases (from mono‐ to tri‐amino silanes) both the CO2 load and the dielectric response at microwave frequencies increase. In particular, functionalization with a tri‐amino silane derivative gave the highest CO2 adsorption and the fastest microwave heating, resulting in a fourfold acceleration of adsorbent regeneration. The grafted material was fully stable for at least 20 adsorption‐regeneration cycles, making it an ideal candidate for microwave‐swing adsorption (MWSA) processes. © 2015 American Institute of Chemical Engineers AIChE J, 62: 547–555, 2016