{"title":"Tailored ETS-4 Molecular Gate Thermal Contractibility via Crystallization Time for N2/CH4 Separation","authors":"Yingqian Wang, Yongyi Wu, Cheng Peng, Wenbin Li, Donghui Zhang","doi":"10.1002/ceat.70305","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>The separation of methane and nitrogen is critical for upgrading low-grade natural gas. However, their similar physicochemical properties render efficient separation extremely challenging. This study explores the application of Engelhard titanosilicate-4 for N<sub>2</sub>/CH<sub>4</sub> separation. Framework thermal contractibility is tailored by regulating crystallization time. Thermal activation enables precise pore-size modulation, affording a superior separation selectivity of 15.1. Furthermore, the material properties are evaluated through structural characterization, adsorption isotherm measurements, and kinetic tests. Finally, in the simulation of a two-bed six-step vacuum pressure swing adsorption (VPSA) process, the obtained methane product has a purity exceeding 95%, validating the promising practical application potential of this adsorbent.</p>\n </div>","PeriodicalId":10083,"journal":{"name":"Chemical Engineering & Technology","volume":"49 9","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Engineering & Technology","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/ceat.70305","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The separation of methane and nitrogen is critical for upgrading low-grade natural gas. However, their similar physicochemical properties render efficient separation extremely challenging. This study explores the application of Engelhard titanosilicate-4 for N2/CH4 separation. Framework thermal contractibility is tailored by regulating crystallization time. Thermal activation enables precise pore-size modulation, affording a superior separation selectivity of 15.1. Furthermore, the material properties are evaluated through structural characterization, adsorption isotherm measurements, and kinetic tests. Finally, in the simulation of a two-bed six-step vacuum pressure swing adsorption (VPSA) process, the obtained methane product has a purity exceeding 95%, validating the promising practical application potential of this adsorbent.
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