Issue 22, 2017

An oriented, siliceous deca-dodecasil 3R (DDR) zeolite film for effective carbon capture: insight into its hydrophobic effect

Abstract

An all-silica deca-dodecasil 3R (Si-DDR) zeolite with a pore size of 0.36 × 0.44 nm2 is highly desirable for membrane-based separation of CO2 (0.33 nm) from N2 (0.364 nm), which is critical in the post-combustion carbon capture process, via molecular recognition of their slight size difference. For the first time, we acquired h0h-oriented, hydrophobic DDR zeolite films through the epitaxial growth of a DDR seed layer with a structure directing agent of methyltropinium iodide. The degree of the out-of-plane orientation and inter-growth was increased with the secondary growth time, while reducing the defects that provide non-selective pathways. The resulting DDR membrane showed a CO2/N2 separation factor (SF) as high as 11.9 at 50 °C (a representative flue-gas temperature) under dry conditions. More desirably, it could achieve a much enhanced CO2/N2 SF of up to 15.9 at 50 °C in the presence of H2O vapor (3rd largest component in the flue-gas). The transport of the larger N2 molecule, plausibly its entering the pore mouth of DDR zeolites, was more inhibited by H2O molecules adsorbed on the membrane surface; it appears that this surface resistance was due to the hydrophobicity of the highly siliceous DDR membrane and beneficial for improving CO2/N2 SFs under wet conditions.

Graphical abstract: An oriented, siliceous deca-dodecasil 3R (DDR) zeolite film for effective carbon capture: insight into its hydrophobic effect

Supplementary files

Article information

Article type
Paper
Submitted
20 Mar 2017
Accepted
05 May 2017
First published
05 May 2017

J. Mater. Chem. A, 2017,5, 11246-11254

An oriented, siliceous deca-dodecasil 3R (DDR) zeolite film for effective carbon capture: insight into its hydrophobic effect

E. Kim, S. Hong, E. Jang, J. H. Lee, J. C. Kim, N. Choi, C. H. Cho, J. Nam, S. K. Kwak, A. C. K. Yip and J. Choi, J. Mater. Chem. A, 2017, 5, 11246 DOI: 10.1039/C7TA02462B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements