期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 49, 页码 27403-27419出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c08296
关键词
-
资金
- EPSRC [EP/N032942/1, EP/N033329/1, EP/R512199/1]
- EPSRC [EP/N033329/1, EP/N032942/1] Funding Source: UKRI
Small pore zeolites like merlinoite have high potential for selective CO2 adsorption. Na- and Cs-exchanged forms shift to narrow-pore form after dehydration, while K-form remains wide-pore. K- and Cs-forms show effects of CO2 adsorption on cation site distributions and framework configuration.
Small pore zeolites that show framework flexibility, such as merlinoite (topology type MER), possess a high potential for the selective adsorption of small gas molecules including CO2. The CO2 adsorption properties of Na-, K-, and Cs-exchanged forms of a merlinoite zeolite with Si/Al = 4.2 have been measured at 298 K, and in situ PXRD was used to follow their structural response to dehydration and CO2 uptake. The Na- and Cs-forms convert from a wide-pore to a narrow-pore form upon dehydration, while the K-form remains in the wide-pore form. The Na- and Cs-forms exhibit stepped CO2 adsorption isotherms, consistent with breathing behavior and expansion from narrow- to wide-pore phases, while K-6.2-MER remains in the wide-pore structure throughout. Synchrotron PXRD of the K- and Cs-forms reveals the effects of CO2 adsorption on the cation site distributions and the framework configuration. All cation forms of MER (4.2) show enhanced adsorption kinetics for Ar compared to those with lower Si/Al, and the wide-pore structure of K-6.2-MER (4.2) shows particularly rapid sorption for both Ar and CO2. Breakthrough curves over K-6.2-MER (4.2) demonstrate good separation of CO2 from CH4 in flowing CO2/CH4 mixtures, even in pelletized form with an alumina binder.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据