物理化学学报Issue(2)：519-526,8.DOI:10.3866/PKU.WHXB201511243
高硅MFI分子筛膜的合成与低温脱除膜内有机模板剂
Synthesis and Low-Temperature Detemplation of High-Silica MFI Zeolite Membranes
摘要
Abstract
High-silica MFI zeolite membranes supported on porousα-alumina discs were prepared by a seeded secondary growth method, using tetrapropylammonium hydroxide (TPAOH) as organic template. First, nanocrystals were deposited on roughα-Al2O3 discs by a spin-on process. Then, based on control ing 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. Final y, cross-linked and dense MFI zeolite membranes were prepared after the third synthesis step, giving a membrane layer thickness of about 8μm, including~5μm dense layers and~3μm intermediate layers. A novel, 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-1∙Pa-1) at 30 °C.关键词
高硅MFI分子筛膜/模板剂脱除/低温加氢裂解/气体膜分离/载体Key words
High-silica MFI zeolite membrane/Template removal/Low-temperature hydrocracking/Gas permeation/Support分类
化学化工引用本文复制引用
赵淑蘅,郎林,江俊飞,阴秀丽,吴创之..高硅MFI分子筛膜的合成与低温脱除膜内有机模板剂[J].物理化学学报,2016,(2):519-526,8.基金项目
The project was supported by the National Natural Science Foundation of China (51202245,51106165) and Natural Science Foundation of Guangdong Province, China (S2013010014896,10251007006000000).国家自然科学基金(51202245,51106165)和广东省自然科学基金(S2013010014896,10251007006000000)资助项目 （51202245,51106165）
