Fabrication of Isomorphously Substituted W‐MFI Membrane with High Performance for Ethanol Separation from Water. Issue 5 (20th January 2022)

• Record Type: Journal Article
• Authors: Saulat, Hammad; Yang, Jianhua; Wensen, Song; Raza, Waseem; He, Gaohong
• Is Part Of: Chemistry, an Asian journal. Volume 17:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-20
• Subjects: Ethanol-permselective membrane -- Hydrothermal growth -- Isomorphous substitution -- MFI zeolite -- W-MFI membrane; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.202101404
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: Isomorphous substitution of heteroatoms is an effective platform for finely tuning the pore chemistry, pore structure, and surface properties of the zeolite framework as catalysts or separation membranes. A continuous and compact isomorphously substituted tungsten (W)‐MFI membrane was firstly developed on coarse α‐Al2 O3 tube dip‐coated with W‐MFI seeds using hydrothermal secondary growth and pretreated synthesis solution. The synthesized W‐MFI membrane is found to be ethanol permselective having a pervaporation based separation factor and flux of 69 and 2.50 kg/m 2 h, respectively while exhibiting the highest separation index of 170 kg/m 2 h for the separation of 5 wt% ethanol‐water mixture among the reported heteroatoms substituted and α‐Al2 O3 supported tubular MFI membranes. The isomorphous substitution of W improves the hydrophobicity and also plays a significant role for the enhanced separation performance. Abstract : An isomorphously substituted W‐MFI membrane was fabricated on W‐MFI seeds coated α‐Al2 O3 tube substrate having desirable features of compactness, enhanced hydrophobicity, and ethanol permselectivity. The synthesized membrane exhibits high separation performance and the highest separation index (170.00 kg/m 2 .h) among heteroatoms substituted and α‐Al2 O3 supported tubular MFI membranes for the separation of 5 wt% ethanol‐water mixture.