Metallo-tetraphenylporphyrin-Based Porous Organic Polymers: Effect of Metal Components on Carbon Dioxide Adsorption and Conversion

A series of metalated porous organic polymers (POPs) derived from tetraphenylporphyrin (TPP) was synthesized, and the specific surface areas, selectivities for CO 2 over N 2 , and conversion properties of the POPs were investigated. The metallo-tetraphenylporphyrin-based porous organic polymers were characterized using FT-IR, 13 C-NMR, TGA, XRD, XPS, HR-FESEM, and EDX. Among the five catalysts studied, non-metalated TPP-based POP exhibited the highest BET surface area of 524.04 m 2 g −1 , whereas the Ni(II)TPP-based POP had the greatest CO 2 /N 2 selectivity at both 298 and 323 K. In terms of the catalytic efficiency for the conversion of styrene oxide to styrene carbonate using CO 2 , 2HPOP exhibited the highest yield of 91.67%, while the yield obtained with the metalated POPs was approximately 20%. This result suggests that the catalytic efficiency for CO 2 conversion is determined by both the selectivity and surface area of the metalated POPs. Moreover, the improvement in the CO 2 /N 2 selectivity resulting from metalation did not play a dominant role in counterbalancing and surpassing the decrease in porosity.