Pure‐silica MFI zeolite membrane by cooperative templating approach for ethanol‐water separation. Issue 6 (23rd January 2021)

• Record Type: Journal Article
• Authors: Lan, Jiancheng; Li, Linzhe; Song, Wensen; Saulat, Hammad; Wu, Haowen; Yang, Jianhua; Yang, Chengmin; Li, Yang; Lu, Jinming; Zhang, Yan
• Is Part Of: AIChE journal. Volume 67:Issue 6(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-01-23
• Subjects: ethanol/water mixture -- MFI zeolite membranes -- tetrabutylammonium (TBA+) -- tetraethylammonium (TEA+); Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.17184
• Languages: English
• ISSNs: 0001-1541

Abstract

Abstract: Pure‐silica MFI zeolite membrane composed of intergrown four prism crystals was fabricated by using tetrabutylammonium (TBA + ) and tetraethylammonium (TEA + ) as cooperating templates and the induced function of MFI seeds under synthesis solution with molar composition of 1TEOS:0.2TBAOH:0.2TEABr:180H2 O. The ethanol/water separation factor was 64 with a flux of 1.40 kg m −2 hr −1 for 5 wt% ethanol/water mixture at 60°C. In contrast, single TBAOH and TEAOH template led to formation of uncontinuous MEL and MFI membrane respectively, without ethanol‐selectivity. The behavior of quaternary ammonium (TBA + and TEA + ) varied in different system: (a) In "TBA + + TEA + " system, TBA + and TEA + were incorporated into MFI zeolite channel simultaneously; (b) In "TPA + + M + " system (M = TEA or TBA), either TEA + or TBA + could not be occluded into channel, however, appropriate amount of TBA + could accelerate membrane crystallization, meanwhile increase in TEA + slowed down crystallization rate of MFI membrane. This work extends the alternative preparation approaches of ethanol perm‐selective MFI membrane.