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

Abstract

The development of low-cost, efficient physisorbents is essential for gas adsorption and separation; however, the intrinsic tradeoff between capacity and selectivity, as well as the unavoidable shaping procedures of conventional powder sorbents, greatly limits their practical separation efficiency. Herein, an exceedingly stable iron-containing mordenite zeolite monolith with a pore system of precisely narrowed microchannels was self-assembled using a one-pot template- and binder-free process. Iron-containing mordenite monoliths that could be used directly for industrial application afforded record-high volumetric carbon dioxide uptakes (293 and 219 cubic centimeters of carbon dioxide per cubic centimeter of material at 273 and 298 K, respectively, at 1 bar pressure); excellent size-exclusive molecular sieving of carbon dioxide over argon, nitrogen, and methane; stable recyclability; and good moisture resistance capability. Column breakthrough experiments and process simulation further visualized the high separation efficiency.

Zinc Containing Small‐Pore Zeolites for Capture of Low Concentration Carbon Dioxide

“…Zeolites already have shown promising performance for CO 2 capture in post-combustion carbon capture processes as well as CO 2 removal in air pre-purification processes (including the international space station, where adesiccant bed is used prior to the zeolite bed for CO 2 capture). [9,23,28,29] Although numerous zeolites have been investigated for carbon capture, [30][31][32][33][34][35] the research for capture of low concentrations of CO 2 (ca. 400 ppm) is scarce,a nd has mainly been focused on low-silica zeolites of the FAU-type (Si/Al less than 2).…”

Single‐atom catalysts supported on ordered porous materials: Synthetic strategies and applications

“…Recently, a Fe SAs/mordenite zeolite monolith with precisely narrowed microchannels was fabricated by a onepot template-and binder-free hydrothermal synthesis using a novel "acid co-hydrolysis" route in Figure 9. 41 The "acid co-hydrolysis" route could slow co-condensation of Fe and Si/Al precursors in the initial gelation stage, resulting in the fine control of tetrahedral Fe single-atom species confirmed by EXAFS. The tetrahedral Fe single-atom sites incorporated into mordenite frameworks played a key role for regulating the microporous sizes to achieve exclusive molecular sieving abilities for gas separation.…”

“…[33][34][35][36][37] Combining the advantages of SACs and OPMs, SAs/OPMs have exhibited promising potentials in various applications, such as organic catalysis, energy-related reactions, environmental protection, sensing and gas separation. 32,[38][39][40][41][42] The confinement effect of porous structure of OPMs is greatly helpful to enhance the catalytic performance and expand the application of SACs.…”

Linker micro-regulation of a Hofmann-based metal–organic framework for efficient propylene/propane separation

“…[7][8][9][10][11][12][13][14] Indeed, a great deal of effort has been devoted to exploring new materials with precisely designed structures for targeted gas molecule separation in recent decades, resulting in over 20 000 MOF structures so far. [15][16][17][18][19][20][21][22] Adsorptive separation of high-purity C 3 H 6 from C 3 H 6 /C 3 H 8 mixtures may not only enhance the productivity of C 3 H 6 but would also be an effective measure for emission reduction.…”