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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 the dry condition. More desirably, it could achieve a much enhanced CO2/N2 SF 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 the wet condition.

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Publication details

The article was received on 20 Mar 2017, accepted on 05 May 2017 and first published on 05 May 2017


Article type: Paper
DOI: 10.1039/C7TA02462B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    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. Cho, J. Nam, S. K. Kwak, A. Yip and J. Choi, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02462B

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