The effects of organic ethers such as diethyl ether, ethylene glycol diethyl ether and diethyl glycol diethyl ether on the structure of double metal cyanide complex catalyst and the structural changes of such catalyst...The effects of organic ethers such as diethyl ether, ethylene glycol diethyl ether and diethyl glycol diethyl ether on the structure of double metal cyanide complex catalyst and the structural changes of such catalyst in the process of propylene oxide polymerization were investigated by EXAFS. The results show that Co in all DMC catalysts is still coordinated by six cyanogens, while Zn is coordinated by O atom in organic complex. The more numerous the number of the ether bond, the higher the coordination numbers of O to Zn ion, the more active the catalyst we make. Five or six O atoms coordinated Zn ion may be the real active center in the process of propylene oxide polymerization.展开更多
根据火电厂过热汽温的动态特性,将先进的预测控制算法和PID控制算法相结合,构成DMCPID串级控制系统。利用DMC预测控制算法的鲁棒性强及 PID控制算法抗干扰性能好的优点,在 Mat lab平台上进行了仿真,结果表明该控制策略具有明显优于常规...根据火电厂过热汽温的动态特性,将先进的预测控制算法和PID控制算法相结合,构成DMCPID串级控制系统。利用DMC预测控制算法的鲁棒性强及 PID控制算法抗干扰性能好的优点,在 Mat lab平台上进行了仿真,结果表明该控制策略具有明显优于常规PID串级控制的性能。展开更多
文摘The effects of organic ethers such as diethyl ether, ethylene glycol diethyl ether and diethyl glycol diethyl ether on the structure of double metal cyanide complex catalyst and the structural changes of such catalyst in the process of propylene oxide polymerization were investigated by EXAFS. The results show that Co in all DMC catalysts is still coordinated by six cyanogens, while Zn is coordinated by O atom in organic complex. The more numerous the number of the ether bond, the higher the coordination numbers of O to Zn ion, the more active the catalyst we make. Five or six O atoms coordinated Zn ion may be the real active center in the process of propylene oxide polymerization.
