Аннотация:Zeolitic imidazolate frameworks based on 2-methylimidazolate linkers with different particle size (200–1000 nm) andcontrolled content of Zn2+ and Co2+ ions have been synthesized by microwave (MW) assisted technique according tooriginal procedures and room-temperature method. The produced materials including monometallic ZIF-8 and ZIF-67samples, bimetallic ZIF-Zn/Co (or ZIF-8/ZIF-67) system, and “core-shell” ZIF-8@ZIF-67 and ZIF-67@ZIF-8 compositeshave been studied in the practically relevant process of selective adsorption of ethane and methane (25 °C). The adsorptionisotherms for both gases on the obtained ZIF materials were measured in a wide pressure range (1–20 atm) for thefirst time. For ZIF-67, the isosteric heats of adsorption for both gases were obtained also for the first time. It was foundthat the nature of the coordination centers in the ZIF frameworks influences their adsorption characteristics. Thus, theobtained materials with Co2+ ions show an increased adsorption capacity towards ethane, which exceEDX the capacitymeasured for the Zn2+-based samples, while the highest methane adsorption value is achieved on a “core-shell” ZIF-67@ZIF-8 composite.
