The sequestration of atmospheric CO₂ into value-added products is of great interest from economic and environmental perspectives. The tetra-shelled Cr_1.3Fe_0.7O₃ hollow sphere as a heterogeneous catalyst was synthesized by a simple hydrothermal method followed by calcination at 600 °C. The synthesized tetra-shelled hollow spheres were characterized by several effective tools. The catalytic performance was studied for the cycloaddition reaction of CO₂ with epoxides under solvent-free conditions. The reaction time, reaction temperature, CO₂ pressure, and the catalyst amount were systematically studied. Under the best-experimented condition ( 0.02 g of the catalyst, 80 °C, 6 h, and 4 bar CO₂ pressure), the catalyst demonstrated a broad substrate scope and functional group tolerance. Besides, the catalyst showed high recycling efficiency for five consecutive reaction cycles with no significant decline in activity.

从经济和环境的角度来看，将大气中的 CO ₂封存到增值产品中是非常有意义的。通过简单的水热法合成四壳 Cr _1.3 Fe _0.7 O ₃空心球作为多相催化剂，然后在 600 °C 下煅烧。合成的四壳空心球通过几种有效的工具进行表征。研究了无溶剂条件下CO ₂与环氧化物的环加成反应的催化性能。反应时间、反应温度、CO ₂压力和催化剂用量进行了系统研究。在最佳实验条件下（0.02 g 催化剂、80 °C、6 h 和 4 bar CO ₂压力），该催化剂表现出广泛的底物范围和官能团耐受性。此外，该催化剂在连续五个反应循环中表现出较高的回收效率，活性没有显着下降。