Synthesis of high-silica Sigma-1 zeolite membranes on hollow fibers for gas separation

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-07-25 DOI:10.1016/j.seppur.2025.134498

Qi Xue, Peng Du, Jiahuan Du, Yuting Zhang, Xuehong Gu

{"title":"Synthesis of high-silica Sigma-1 zeolite membranes on hollow fibers for gas separation","authors":"Qi Xue, Peng Du, Jiahuan Du, Yuting Zhang, Xuehong Gu","doi":"10.1016/j.seppur.2025.134498","DOIUrl":null,"url":null,"abstract":"DDR-type zeolite, owning small eight-membered-ring (8MR) pores, is a good membrane material for CO2/CH4 and H2/CH4 separation. All-silica DDR (DD3R) zeolite membranes have been studied for many years but it is difficult to avoid the growth of impurity crystals and hazardous ethylenediamine is used as a mineralizer. Al-containing Sigma-1 zeolite which is isostructural with DD3R, is synthesized using sodium hydroxide as the mineralizer. In this study, high-silica Sigma-1 zeolite membranes (Si/Al = ∼60) were synthesized for the first time and employed in H2/CH4 and CO2/CH4 separation. Effects of template concentration and H2O/SiO2 ratio in precursor solution on membrane quality were investigated extensively. When the precursor solution has molar composition of 9 ADA: 60 SiO2: 1 NaAlO2: 3 NaOH: 6000 H2O, a high-quality Sigma-1 zeolite membrane (3.6 μm thick) was acquired. The membrane exhibited the highest H2/CH4 and CO2/CH4 separation selectivities (117 and 304), and the corresponding H2 and CO2 permeances were 1.60 × 10−8 mol m−2 s−1 Pa−1 and 3.51 × 10−8 mol m−2 s−1 Pa−1, respectively. Additionally, the membrane showed good separation stability under both dry and humid conditions.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"54 1","pages":""},"PeriodicalIF":9.0000,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.seppur.2025.134498","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

DDR-type zeolite, owning small eight-membered-ring (8MR) pores, is a good membrane material for CO₂/CH₄ and H₂/CH₄ separation. All-silica DDR (DD3R) zeolite membranes have been studied for many years but it is difficult to avoid the growth of impurity crystals and hazardous ethylenediamine is used as a mineralizer. Al-containing Sigma-1 zeolite which is isostructural with DD3R, is synthesized using sodium hydroxide as the mineralizer. In this study, high-silica Sigma-1 zeolite membranes (Si/Al = ∼60) were synthesized for the first time and employed in H₂/CH₄ and CO₂/CH₄ separation. Effects of template concentration and H₂O/SiO₂ ratio in precursor solution on membrane quality were investigated extensively. When the precursor solution has molar composition of 9 ADA: 60 SiO₂: 1 NaAlO₂: 3 NaOH: 6000 H₂O, a high-quality Sigma-1 zeolite membrane (3.6 μm thick) was acquired. The membrane exhibited the highest H₂/CH₄ and CO₂/CH₄ separation selectivities (117 and 304), and the corresponding H₂ and CO₂ permeances were 1.60 × 10⁻⁸ mol m⁻² s⁻¹ Pa⁻¹ and 3.51 × 10⁻⁸ mol m⁻² s⁻¹ Pa⁻¹, respectively. Additionally, the membrane showed good separation stability under both dry and humid conditions.

Abstract Image

查看原文本刊更多论文

中空纤维上高硅Sigma-1沸石膜气体分离的合成

ddr型沸石具有较小的八元环孔（8MR），是分离CO2/CH4和H2/CH4的良好膜材料。全硅DDR （DD3R）沸石膜的研究已有多年，但难以避免杂质晶体的生长，且矿化剂常使用有害物质乙二胺。以氢氧化钠为矿化剂合成了与DD3R同构的含al Sigma-1沸石。本研究首次合成了高硅Sigma-1沸石膜（Si/Al = ~ 60），并将其用于H2/CH4和CO2/CH4分离。研究了前驱体溶液中模板浓度和水/硅比对膜质量的影响。当前驱体溶液的摩尔组成为9 ADA: 60 SiO2: 1 NaAlO2: 3 NaOH: 6000 H2O时，可制得厚度为3.6 μm的Sigma-1沸石膜。膜表现出最高的H2 / CH4和CO2 / CH4的分离选择性(117和304),和相应的H2和CO2透过1.60 × 10−8 摩尔 m−2 s−1 Pa−1和3.51 × 10−8 摩尔 m−2 年代−1 Pa−1,分别。此外，该膜在干燥和潮湿条件下均表现出良好的分离稳定性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.