高硅MFI分子筛膜的合成与低温脱除膜内有机模板剂

doi:10.3866/PKU.WHXB201511243

Abstract

Abstract:

High-silica MFI zeolite membranes supported on porous α-alumina discs were prepared by a seeded secondary growth method, using tetrapropylammonium hydroxide (TPAOH) as organic template. First, nanocrystals were deposited on rough α-Al₂O₃ discs by a spin-on process. Then, based on controlling the H₂O/Si molar ratio of the synthetic solution, a restricting in-plane h0h-oriented growth method with an ultra-dilute precursor was designed to prepare non-defective zeolite membranes that were as thin as possible. Finally, crosslinked and dense MFI zeolite membranes were prepared after the third synthesis step, giving a membrane layer thickness of about 8 μm, including ~5 μm dense layers and ~3 μm intermediate layers. Anovel, two-step method, coupling by low-temperature hydrocracking and oxidation, is proposed for efficient removal of the template from zeolite membranes. Compared with traditional high-temperature calcination, template removal by the two-step method could eliminate the grain boundary defects formed in response to stresses induced by heat treatment. As a result, the membranes treated by the two-step detemplation method displayed a preferable CO₂/N₂ separation factor (about 5.2) and high CO₂ permeance (5.8 × 10^-7 mol·m^-2·s^-11·Pa^-1) at 30 ℃.

Key words: High-silica MFI zeolite membrane, Template removal, Low-temperature hydrocracking, Gas permeation, Support

Shu-Heng ZHAO,Lin LANG,Jun-Fei JIANG,Xiu-Li YIN,Chuang-Zhi WU. Synthesis and Low-Temperature Detemplation of High-Silica MFI Zeolite Membranes[J]. Acta Phys. -Chim. Sin. 2016, 32(2), 519-526. doi: 10.3866/PKU.WHXB201511243

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Synthesis and Low-Temperature Detemplation of High-Silica MFI Zeolite Membranes

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