Research Article

Self-assembled iron-containing mordenite monolith for carbon dioxide sieving

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Science  16 Jul 2021:
Vol. 373, Issue 6552, pp. 315-320
DOI: 10.1126/science.aax5776

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Channeling carbon dioxide

The separation of gas molecules with physisorbents can be challenging because there is often a tradeoff between capacity and selectivity. Zhou et al. report a template-free hydrothermal synthesis of the one-dimensional channel zeolite mordenite, in which some silicon was replaced by iron. Rather than forming a powder that requires further shaping, this mechanically stable material self-assembled into monoliths. Iron atoms bound in tetrahedral zeolite sites narrowed the channels and enabled the size-exclusion separation of carbon dioxide (CO2) over nitrogen (N2) and methane. High CO2 uptake and highly efficient CO2–N2 separation was demonstrated for both dry and humid conditions.

Science, aax5776, this issue p. 315

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