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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: Triphenylphosphine-based functional porous polymer as an efficient heterogeneous catalyst for the synthesis of cyclic carbonates from CO2

Fig. 5

Nitrogen adsorption–desorption isotherms of (a) TPDB and (b) TPDB-BP-TEA. BET surface areas and pore size distributions of the polymers TPDB and TPDB-BP-TEA were measured by analyzing N2 adsorption and desorption isotherms at 77 K. The steep rise in the high P/P0 region indicates that the material consists of micropores and mesopores. TPDB presents a high BET surface area of 493.15 m2/g, pore volume of 0.54 cm3/g, and average pore size of 4.38 nm. After the two-step modification, the BET surface area and pore volume decreased to 227.12 m2/g and 0.41 cm3/g, respectively

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