A novel Zn/Co zeolitic imidazolate framework (ZIF) has been constructed which demonstrates better gas adsorption (CO₂, CH₄ and N₂) and catalytic (CO₂ conversion) properties compared with ZIF-8 and ZIF-67.

In the midst of the global climate change phenomenon, mainly caused by fossil fuel burning to provide energy for our daily life and discharge of CO₂ into the atmosphere, biogas is one of the important renewable energy sources that can be upgraded and applied as a fuel source for energy in daily life. The advantages of the production of hybrid materials, metal–organic framework (MOF) adsorbents, expected for the biogas upgrading, rely on the bulk separation of CO₂ under near-ambient conditions. This review highlights the challenges for MOF adsorbents, which have the greatest upgrading abilities for biogas via selective passage of methane. The key factors improving the ideal MOF materials for these high CO₂ capture and selectivity uses for biogas upgrading to produce bio-methane and reduce fossil-fuel CO₂ emission will be discussed.

ZIF-67 acts as a very efficient catalyst for the cycloaddition of CO₂ to epoxides affording cyclic carbonates with high selectivity, without any need for a solvent or a co-catalyst.