Micro interfacial Effect: The stability of catalytic activity under gas–liquid reaction pressure changes

The conversion of CO2 usually requires high temperature, high pressure and long reaction time, due to its chemical stability and gas–liquid mass transfer resistance. Based on the micro interfacial effect, the nano-micro interface reaction units (NMRUs) were designed and prepared for the efficient conversion of CO2 under mild conditions. NMRUs are made up of the micron-sized droplet inside and the nano-porous shell, which can significantly increase the gas–liquid contact area and thus intensify mass transfer from gas to liquid. Compared with the gas–liquid reaction system (G-L) in the traditional autoclave, the prominent intensification on CO2 cycloaddition by NMRUs is achieved at 25℃ and 0.1 MPa, with the equilibrium time shortened by more than a half. Noticeably, the influence of pressure on the gas–liquid reaction in NMRUs was nearly negligible, which was explained by the interface mass transfer mathematical model. The strengthening mechanism of NMRUs was further explored with the kinetic simulation.