Studies on chemical fixation of CO2 and syntheses of alkylene carbonates

Chemical fixation Of CO2 is a research hotspot in recent years. In this pap er, it is reported that PcAlCl and quaternary ammonium (or quaternary phosp honium) halides, including n-BuPh3PBr, n-Bu4NBr, MePh3PI or n-Bu4NI, have s trong synergetic catalytic effects on the cycloaddition of alkylene oxides and CO2 for preparing alkylene carbonates. At the optimum temperature of 10 0 degreesC, the binary system of n-BuPh(3)pBr and PcAlCl has a catalytic ac tivity of 360 mol/ (mol . h) and 99% selectivity, while the catalytic activ ity of PcAlCl and n-BuPh3PBr are only 57 mol/(mol . h) and 90 mol/(mol . h) , respectively. It is suggested from the experimental results that 1 : 1 co mplex between PcAlCl and n-BuPh3PBr may be formed, which is the main reason for synergetic strengthening of catalytic activity of PcAlCl and n-BuPh3PB r.