The Phosphonitrilic-derived graphynes as promising adsorbents of greenhouse gases

The new hybrid graphyne-like materials with highly developed specific surface area and excellent greenhouse gas adsorption properties have been described. Inorganic P₃N₃Cl₆ was selected as a building block and 1,4-diacetylene benzene was chosen as a linker for these materials. The chemical structure of P₃N₃Cl₆ allows for creation of three-dimensional materials with the BET surface area ranging from 600 to 1000 m² g⁻¹ and a pore volume as high as 0.3 cm³ g⁻¹. The obtained materials showed microporous structure and distinctive greenhouse gas adsorption properties. For those materials, CO₂ adsorption reached as high as 1.5 mmol g⁻¹, while for N₂O ranged from 1.5 to 1.7 mmol g⁻¹, and for CH₄ was 0.4 mmol g⁻¹ when adsorption was carried out at 100 kPa and 300 K. Moreover, obtained by the modified Dubinin adsorption model, the maximum adsorption values were 2.5–11 mmol g⁻¹ depending on the type of materials used. This finding suggests that new materials are promising high-pressure adsorbents of greenhouse gases.