Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 46, Pages 19246-19253Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja309274y
Keywords
-
Categories
Funding
- Australian Government through its CRC program
- CSIRO OCE
Ask authors/readers for more resources
Separation of molecules based on molecular size in zeolites with appropriate pore aperture dimensions has given rise to the definition of molecular sieves and has been the basis for a variety of separation applications. We show here that for a class of chabazite zeolites, what appears to be molecular sieving based on dimension is actually separation based on a difference in ability of a guest molecule to induce temporary and reversible cation deviation from the center of pore apertures, allowing for exclusive admission of certain molecules. This new mechanism of discrimination permits size-inverse separation: we illustrate the case of admission of a larger molecule (CO) in preference to a smaller molecule (N-2). Through a combination of experimental and computational approaches, we have uncovered the underlying mechanism and show that it is similar to a molecular trapdoor. Our materials show the highest selectivity of CO2 over CH4 reported to date with important application to natural gas purification.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available