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

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Channeling carbon dioxide

Separating gas molecules with physisorbents can be challenging as there is often a trade-off between capacity and selectivity. Zhou et al. report on a template-free hydrothermal synthesis of the one-dimensional channel zeolite mordenite, in which part of the silicon was replaced by iron. Instead of forming a powder that has to be shaped further, this mechanically stable material assembles itself into monoliths. Iron atoms bound in tetrahedral zeolite centers narrowed the channels and enabled the size exclusion of carbon dioxide (CO2) over nitrogen (N2) and methane. High CO content2 Ingestion and highly efficient CO2-No2 The separation was demonstrated for both dry and wet conditions.

science, aax5776, this edition p. 315

abstract

The development of inexpensive and efficient physisorbents is essential for gas adsorption and separation; however, the intrinsic compromise between capacity and selectivity and the inevitable shaping processes of conventional powder sorbents severely limit their practical separation performance. Here an extremely stable iron-containing mordenite zeolite monolith with a pore system of precisely narrowed microchannels was self-organized using a template and binder-free potting process. Ferrous mordenite monoliths, which could be used directly for industrial application, provided record high volumetric carbon dioxide uptake (293 and 219 cubic centimeters of carbon dioxide per cubic centimeter of material at 273 and 298 K at 1 bar pressure); excellent size exclusive molecular sieving of carbon dioxide against argon, nitrogen and methane; stable recyclability; and good moisture resistance. Column breakthrough experiments and process simulations made the high separation efficiency even more visible.

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