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Characterization and properties of Zn/Co zeolitic imidazolate frameworks vs. ZIF-8 and ZIF-67

Zhou, Kui, Mousavi, Bibimaryam, Luo, Zhixiong, Phatanasri, Shophot, Chaemchuen, Somboon, Verpoort, Francis
Journal of materials chemistry A 2017 v.5 no.3 pp. 952-957
X-ray diffraction, adsorption, ambient temperature, carbon dioxide, carbonates, catalytic activity, cobalt, energy-dispersive X-ray analysis, methane, nitrogen, physicochemical properties, porosity, scanning electron microscopy, surface area, transmission electron microscopy, zinc
A novel Zn/Co zeolitic imidazolate framework (ZIF) has been constructed by an easy and straightforward room temperature technique. Several characterization techniques such as SEM, TEM-EDX, single-crystal XRD and ICP have been applied to confirm that the structure formed is a sodalite (SOD) cage type structure. The Zn/Co-ZIF possesses a high nano-crystallinity and porosity with a large surface area. By tuning the amount of Co and Zn in the Zn/Co zeolitic imidazolate framework, the physical and chemical properties have been improved compared with those of the single metal frameworks (ZIF-8 and ZIF-67). Consequently, the Zn/Co-ZIF was investigated for two different applications; gas adsorption (CO₂, CH₄ and N₂) and catalysis (CO₂ conversion to cyclic carbonates) and the obtained results were compared with the performance of previously reported single metal frameworks (ZIF-8 and ZIF-67). Additionally, hydrolytic stability tests under ambient conditions and immersed in water at 75 °C were performed and pointed out that Zn/Co-ZIF exhibits a higher stability. Moreover, based on these results, the Zn/Co-ZIF demonstrates better properties compared with ZIF-8 and ZIF-67.