Direct Conversion of CO<sub>2</sub> in Lime Kiln Waste Gas Catalyzed by a Copper‐Based <i>N</i>‐heterocyclic Carbene Porous Polymer
Zhi‐Xiu Rao, Pei‐Bo Chen, Jin Xu, Qing Wang, Haitao Tang, Ying Liang, Ying‐Ming Pan
Abstract
Abstract Industrial waste gas is one of the major sources of atmospheric CO 2 , yet the direct conversion of the low concentrations of CO 2 in waste gases into high value‐added chemicals have been a great challenge. Herein, a copper‐based N ‐heterocyclic carbene porous polymer catalyst (Cu@NHC‐1) for the direct conversion of low concentration CO 2 into oxazolidinones was successfully fabricated via a facile copolymerization process followed by the complexation with Cu(OAc) 2 . A continuous flow device was designed to deliver a continuous and stable carbon source for the reaction. Due to the triple synergistic effect of its porous structure, nitrogen activation sites and catalytic Cu center, Cu@NHC‐1 shows highly efficient and selective adsorption, activation, and conversion of the low concentration CO 2 (30 vol%). Its practical application potential is demonstrated by the ability to successfully convert the CO 2 in lime kiln waste gas into oxazolidinones in satisfactory yields under mild conditions.