用于高效CO/CH分离的无阳离子氧化锆负载CHA沸石膜的合成

Synthesis of Cation-Free Zirconia-Supported Zeolite CHA Membranes for Efficient CO/CH Separation.

作者信息

Wang Nana, Dang Guiliu, Bai Zhenwei, Wang Qing, Liu Bo, Zhou Rongfei, Xing Weihong

机构信息

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China.

School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China.

出版信息

ACS Appl Mater Interfaces. 2023 Apr 5;15(13):16853-16864. doi: 10.1021/acsami.2c21682. Epub 2023 Mar 27.

DOI:10.1021/acsami.2c21682

PMID:36972317

Abstract

Cation-free zirconosilicate zeolite CHA and thin zirconia-supported membranes were synthesized in a fluoride-free gel for the first time. The usage of the ZrO/AlO composite support inhibited the transportation of aluminum from the support into zeolite membranes. No fluorite source was used for the synthesis of cation-free zeolite CHA membranes, indicating the green property of the synthesis. The thickness of the membrane was only 1.0 μm. The best cation-free zeolite CHA membrane prepared by the green synthesis displayed a high CO permeance of 1.1 × 10 mol/(m s Pa) and CO/CH selectivity of 79 at 298 K and 0.2 MPa pressure drop for an equimolar CO/CH mixture.

摘要

首次在无氟凝胶中合成了无阳离子的CHA型锆硅酸盐沸石和氧化锆薄膜负载型膜。ZrO/AlO复合载体的使用抑制了铝从载体向沸石膜的迁移。在无阳离子CHA型沸石膜的合成中未使用萤石源，表明该合成具有绿色环保特性。膜的厚度仅为1.0μm。通过绿色合成制备的最佳无阳离子CHA型沸石膜在298K和0.2MPa压降条件下，对于等摩尔CO/CH混合物，显示出1.1×10⁻⁷mol/(m²·s·Pa)的高CO渗透率和79的CO/CH选择性。