炔丙基
层状双氢氧化物
催化作用
纳米颗粒
材料科学
炔丙醇
化学工程
核化学
化学
纳米技术
有机化学
工程类
作者
Yankai Liu,Ruinian Zhou,Jianyu Qu,Feng Han,Shuai Zhang,Xingliang Xu
标识
DOI:10.1016/j.apcata.2021.118444
摘要
Upgrading carbon dioxide (CO 2 ) into valuable products is a highly promising strategy of artificial carbon cycle. In this study, a series of in situ reduced CuMgAl layered double hydroxides (R-CuMgAl-LDHs) composites were synthesized, in which Cu nanoparticles were effectively dispersed and anchored on MgAl-LDHs with formation of Cu + and Cu 0 species. The optimized R-Cu 1.5 Mg 1.5 Al 1 -LDH exhibited excellent catalytic performance for the carboxylative cyclization of 2-methyl-3-butyn-2-ol with CO 2 (turnover number of 243) under mild conditions. The layered structure of LDH stabilized the active Cu species with high dispersion, enhancing the catalytic efficiency of this carboxylative cyclization reaction. Simultaneously, the dual-activation of both CO 2 and propargylic alcohol by Cu 0 /Cu + species generated on the surface of LDH contributed significantly to the catalytic efficiency enhancement. Furthermore, R-Cu 1.5 Mg 1.5 Al 1 -LDH catalyzed the reaction of a wide range of terminal or internal propargyl alcohols with CO 2 , yielding various functionalized α-alkylene cyclic carbonates. Finally, a reasonable reaction mechanism was put forward according to the comprehensive analysis. • In-situ synthesis method gave Cu nanoparticles-dispersed on Mg-Al-LDH (R-CuMgAl-LDH). • R-Cu 1.5 Mg 1.5 Al 1 -LDH exhibited excellent performance in carboxylative cyclization. • R-Cu 1.5 Mg 1.5 Al 1 -LDH showed good recyclability and a wide substrate scope. • LDH and Cu 0 /Cu + species acted synergistically to boost catalyst activity.
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