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液相氧化-低温煅烧脱除Silicalite-1膜模板剂及其性能研究

作者：沈东，杨建华，肖伟，李田生，鲁金明，王金渠

单位：大连理工大学精细化工国家重点实验室吸附与无机膜研究所

关键词： Silicalite-1沸石膜；液相氧化；渗透蒸发；气体渗透

DOI号：

分类号： TQ028. 8

出版年,卷(期):页码： 2011,31(1):61-65

摘要：

采用原位生长法在管状大孔α-Al2O3载体外表面上合成致密连续Silicalite-1沸石膜，利用双氧水和稀硝酸混合液液相氧化-低温煅烧方法脱除Silicalite-1沸石膜的模板剂，并用扫描电镜(SEM)、气体渗透测试，渗透蒸发（PV）等表征手段对沸石膜的性能进行评价。结果表明所制备的Silicalite-1膜表面晶粒交互生长，致密，连续，膜的厚度约为10 μm。在293 K，0.1 MPa 压差条件下，N2的渗透速率为8.16×10-7 mol/(m2•s•Pa)，N2/i-C4H10理想分离系数为达到425，428 K下CO2/N2的理想分离系数为2.89。在333 K下，渗透蒸发分离5% wt乙醇/水混合液，乙醇/水的分离系数αA/W达到40.3，通量J为0.83kg/(m2•h)。

Silicalite-1 zeolite membrane was prepared on macro porous α-Al2O3 support by in-situ crystallization method. Liquid phase oxidation and low-temperature calcination method was used to remove template molecules from Silicalite-1 membrane, which replaced the conventional high temperature calcination method. SEM, single gas permeation and pervaporation (PV) performance tests as a function of temperature were used to characterize the as-synthesized zeolite membrane. The results showed that the prepared membrane was typical Silicalite-1, continuous, dense and no obvious defects. The permeance of N2 is 8.16×10-7 mol/(m2•s•Pa) and the ideal selectivity of N2/i-C4H10 was up to 425 at 293 K and ideal selectivity of CO2/N2 was 2.89 at 428 K. The fluxes of Silicalite-1 membrane at 333 K is 0.83 kg/(m2•h) towards ethanol/H2O mixtures, and the corresponding separation factors was 40.3.

基金项目：

作者简介：

沈东(1981 - )，男，河北保定人，在读硕士，电话：13940908256，从事Silicalite-1沸石膜的制备、表征及其应用研究。

参考文献：

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