The Effect Of Modification On Low-cost TS-1and Its Catalytic Performance In Gas Phase Epoxidation Of Propylene

In this work, taken low-cost TS-1as parent, we systematically studied the effect of different treatment and the calcination condition on cataytical performacne of modified TS-1in gas-phase epoxidation of propylene. Meanwhile, all TS-1samples were characterized by SEM, XRD, UV-Vis, FT-IR, UV-Raman and N2physical adsorption technologies, etc..1. The treatment of TPAOH was not applicable to all low-cost TS-1samples. Taken TS-1with poor TPAOH-treated effect as an example, it was found that the catalytic performance of treated TS-1in gas phase expoxidation of propylene can be improved by adding trace amounts of Na2SO3during catalyst modification. The conversion of propylene, the selectivity of propylene oxide and the effective utilization of hydrogen peroxide were increased to9.1%、98.5%and42.0%, respectively.2. For low-cost TS-1, the modification effect was not good by using the mixed solusion of TPAOH and inorganic base (LiOH、 NaOH、 KOH); while, the treatment effect was better if only using inorganic base, and the trend of treatment effect was LiOH>NaOH>KOH. It was worth mentioning that TS-1treated by0.3g LiOH had the best catalytic property:the conversion of propylene, the selectivity of propylene oxide and the effective utilization of hydrogen peroxide were9.1%、98.5%and42.0%, respectively.3. For TPAOH-Na2SO3treated TS-1in gas phase expoxidation of propylene, the conversion of propylene was firstly increased then decreased as the calcination temperature increased. When the calcination temperature was350℃; the selectivity of propylene oxide did not have obvious uchange.4. For TPAOH-Na2SO3treated TS-1in gas-phase epoxidation of propylene, the catalytic performance of TS-1calcinated under540℃in N2atmosphere (TS-1-N) was better than that calcinated in air (still air and flowing air, TS-1-A and TS-1-D). The conversion of propylene, the selectivity of propylene oxide and the effective utilization of hydrogen peroxide waere9.6%,97.4%and43.8%, respectively.