Hota, Mrinal Kanti
Alshareef, Husam N.
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Chemical Engineering Program
Core Lab, King Abdullah University of Science and Technology, 23955, Thuwal, Saudi Arabia
Functional Nanomaterials and Devices Research Group
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberBAS/1/1323-01-01
Online Publication Date2019-11-06
Print Publication Date2020-03
Embargo End Date2020-11-06
Permanent link to this recordhttp://hdl.handle.net/10754/661450
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AbstractIndustrial separations belong to some of the most energy-intensive technological processes because of the reliance on heat-consuming unit operations involving a phase change, such as distillation. Membrane technology promises large cuts to those energy needs; however, its progression is hindered as currently available membranes lack separation performance as well as chemical and mechanical stability. To address these challenges, carbon molecular sieves (CMSs) have long been suggested as promising candidates providing excellent and robust molecular separation performance. In this work, we introduce nanohybrid CMS membranes fabricated by pyrolyzing a polyimide of intrinsic microporosity (PIM-PI) precursor modified by vapor phase infiltration (VPI). In the VPI process, a metal-organic precursor, trimethylaluminum (TMA), first diffuses into the high free volume matrix of the PIM-PI to form a complex with its functional groups. Afterward, water vapor selectively and locally oxidizes the TMA to form nanodispersed Al2O3 within the PIM-PI matrix. Subsequent inert-atmosphere pyrolysis leads to the formation of Al2O3-doped, high-quality, thin-film composite CMS membranes with excellent molecular separation properties for a number of technologically important gas pairs, e.g. CO2/CH4 > 100, O2/N2 > 9. The introduction of VPI-doped hybrid CMS membranes allows obtaining extraordinary gas separation performance typical to high temperature undoped CMS at much lower pyrolysis temperatures. This presents significant advantages such as reduction of mechanical failure risk, wider spectrum of possible supports, and reduced fabrication complexity.
CitationOgieglo, W., Puspasari, T., Hota, M. K., Wehbe, N., Alshareef, H. N., & Pinnau, I. (2020). Nanohybrid thin-film composite carbon molecular sieve membranes. Materials Today Nano, 9, 100065. doi:10.1016/j.mtnano.2019.100065
SponsorsThis work was supported by KAUST baseline funding for I.P.(BAS/1/1323-01-01). W.O. is thankful for an extensive possibility to use KAUST Solar Center facilities for ellipsometry characterization.
JournalMaterials Today Nano