Two novel types of heterogeneous catalysts apply to synthesize cyclic carbonates through CO2 fixation on epoxides under mild condition

Chuang, Jia YuJia YuChuangLiu, Kuan TingKuan TingLiuLin, Monica MengdieMonica MengdieLinWen-Yueh YuRU-JONG JENGLeung, Man-kitMan-kitLeung2023-10-252023-10-252023-10-0122129820https://scholars.lib.ntu.edu.tw/handle/123456789/636512The present work focuses on developing heterogeneous catalysts for conversion of CO2 and mono-/di-epoxides to mono-/bis-cyclic carbonates. To achieve this purpose, two types of recyclable solid catalysts, namely polyurethane (PU-BTP) and polyurethane modified on silica gel-solid support (SG-AU-BPT), are synthesized. On these catalysts, the key promoter CaI2 is pre-absorbed. Both catalysts show high catalytic activity under mild conditions. For example, phenyl glycidyl ether (PGE) can be converted to 4-(phenoxymethyl)− 1,3-dioxolan-2-one at 60 °C within 6 h under 1 atm pressure of CO2. PU-BTP and SG-AU-BPT can be recollected by suction filtration and reused for eight times with conversion larger than 81% and 95% respectively. These results indicate that the degree of CaI2 leaching out from the catalysts in each cycle and loss is low.Carbon dioxide fixation | Cyclic carbonates | Heterogeneous catalysts | Silica gelTwo novel types of heterogeneous catalysts apply to synthesize cyclic carbonates through CO2 fixation on epoxides under mild conditionjournal article10.1016/j.jcou.2023.1025922-s2.0-85173187077https://api.elsevier.com/content/abstract/scopus_id/85173187077