title: Amine-Appended Hierarchical Ca-A Zeolite for Enhancing CO2/CH4Selectivity of Mixed-Matrix Membranes.
abstract: An amine-appended hierarchical Ca-A zeolite that can selectively capture CO2was synthesized and incorporated into inexpensive membrane polymers, in particular polyethylene oxide and Matrimid, to design mixed-matrix membranes with high CO2/CH4selectivities. Binary mixture permeation testing reveals that amine-appended mesoporous Ca-A is highly effective in improving CO2/CH4selectivity of polymeric membranes. In particular, the CO2/CH4selectivity of the polyethylene oxide membrane increases from 15 to 23 by incorporating 20 wt % amine-appended Ca-A zeolite. Furthermore, the formation of filler/polymer interfacial defects, which is typically found in glassy polymer-zeolite pairs, is inhibited owing to the interaction between the amine groups on the external surface of zeolites and polymer chains. Our results suggest that the amine-appended hierarchial Ca-A, which was utilized in membrane fabrication for the first time, is a good filler material for fabricating a CO2-selective mixed-matrix membrane with defect-free morphology.
authors: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
authors: Tien Hoa
authors: TH
authors: Nguyen
authors: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
authors: Heqing
authors: H
authors: Gong
authors: Singapore Membrane Technology Center, Nanyang Technological University, 1 Clean Techloop, Singapore, 637141, Singapore.
authors: Siew Siang
authors: SS
authors: Lee
authors: School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore. thbae@ntu.edu.sg.|Singapore Membrane Technology Center, Nanyang Technological University, 1 Clean Techloop, Singapore, 637141, Singapore. thbae@ntu.edu.sg.
authors: Tae-Hyun
authors: TH
authors: Bae
keywords: CO2 capture; CO2/CH4 separation; Ca-A; hierarchical zeolites; mixed-matrix membranes