Melamine‐Based Metal‐Chelating Porous Organic Polymers for Efficient CO₂ Capture and Conversion

Abstract

Due to their tailored porosity, high catalytic activity and excellent chemical/thermal stability, porous organic polymers and their metal complexes hold promising potential in CO 2 capture and conversion. In this work, two kinds of melamine-based porous polymers (TPAMP and TPBMP) and their zinc complexes (Zn-TPAMP and Zn-TPBMP) were synthesized. Zn-TPAMP and Zn-TPBMP present high CO 2 uptake of 11.7 wt.-% and 16.8 wt.-% at 273 K and 1 bar, respectively. In particular, Zn-TPAMP demonstrates high catalytic activity for the cycloaddition of CO 2 with epoxides (TOF: 1383 h -1 ). The high CO 2 For the past decades, the overwhelming CO 2 emission has caused the overall global warming, and 40 % of the CO 2 emissions are released from the fossil fuel-based power plants. Therefore, the post-combustion CO 2 capture is considered to be an effective way for reduction of the CO 2 level in the atmosphere. On the other hand, CO 2 can be served as a cheap and non-toxic block for C 1 chemistry. [1] Thus, CO 2 capture and conversion from the fossil fuel-based power plants have been attracting increasing attention in recent years. In order to achieve effective CO 2 capture various solid materials such as zeolites, metal organic frameworks (MOFs), carbon material, and porous organic polymers (POPs) have been intensively investigated. [2] Among them, POPs hold promising potential due to their tailored porosity, high catalytic activity and excellent chemical/ thermal stability. However, their capability of CO 2 uptake is urgent to be improved to fulfil the practical requirements. Typically, there are two main methods to improve the CO 2 uptake for the POPs: i) Introducing functional groups especially nitrogen-rich functional groups on the skeleton of the POPs. These groups have strong affinity to CO 2 , inducing enhanced CO 2 uptake. Therefore, nitrogen-rich functional groups which have strong affinity to CO 2 , such as azo, [3] imidazole, [4] triazine [5] and amine groups [6] have been frequently grafted to the skeleton of the POPs. For example, Bhunia et al. reported a series of [a] College

Triaminopyrimidine Based Porous Organic Polymers: Synthesis, Characterization and Catalytic Applications in One‐pot Room Temperature Synthesis of Dihydropyranopyranes

“…In addition, the steep uptake of very large amount of gas at high relative pressures P/P 0 > 0.90 is attributed to interparticulate voids generated by the less compact packing of small particles. Additional support for this conclusion also obtained from recent reports, involving analogous polyaminal networks. From the Brunauer‐Emmett‐Teller (BET) isotherm, the specific surface area and the total pore volume of the material are found to be 203 m 2 g −1 and 0.8694 cm 3 g −1 , respectively.…”

Metal-assisted synthesis of salen-based porous organic polymer for highly efficient fixation of CO2 into cyclic carbonates

“…Co-salen-POP was also compared with other reported solid catalysts for the conversion of propylene epoxide (PO) to propylene carbonate (PC) (Tables S2 and S3†). It is noteworthy that Co-salen-POP exhibited higher efficiency under similar conditions compared with previously reported supported metal complexes such as salen complexes, 49,58,65 metalated porous organic polymers, 62,66–69 and MOFs. 70…”

Synthesis of Naphthalene-Based Polyaminal-Linked Porous Polymers for Highly Effective Uptake of CO2 and Heavy Metals

“…Then, in the intermediate pressure range, nearly horizontal adsorption occurs. Furthermore, when relative pressure (P/P 0 ) surpasses 0.8, N 2 uptake increases dramatically, indicating the presence of bigger mesopores, which are mostly caused by interparticle voids induced by loose packing of fine particles, as demonstrated by SEM micrographs ( Figure 4 ) [ 23 , 25 , 26 ]. On the other hand, the polymer exhibits reversible adsorption–desorption isotherms, which differ from the hysteresis phenomena commonly reported in many other porous organic polymers due to pore structural deformation during measurements in liquid N 2 .…”