基于 H2/O2 等离子体和钛硅沸石的丙烯气相环氧化方法

 将 H₂/O₂ 非平衡等离子体现场产生的气态 H₂O₂和丙烯与耦合反应器中钛硅沸石 TS-1 直接接触, 实现了丙烯气相环氧化反应. 结果表明, 非平衡等离子体生成气态 H₂O₂ 的速率由介质阻挡放电的输入功率决定, 环氧丙烷的生成速率和选择性取决于钛硅沸石催化剂和反应条件. 在 H₂ 和 O₂ 进料流量分别为 170 和 8 ml/min, 介质阻挡放电输入功率为 3.5 W, 环氧化反应温度为 110 ^oC, 丙烯进料量为 18 ml/min, 催化剂用量为 0.8 g 的条件下, 生成环氧丙烷产率达 246.9 g/(kg•h)、环氧丙烷选择性和 H₂O₂ 有效利用率分别为 95.4% 和 36.1%, 反应 36 h 内未见催化剂失活.

Gas Phase Epoxidation of Propylene with TS-1 and in Situ H2O2 Produced by a H2/O2 Plasma

Gas phase epoxidation of propylene was performed by directly contacting propylene and gaseous H₂O₂ on the surface of TS-1 catalyst in an integrated reactor. The gaseous H₂O₂ was produced in situ by a H₂/O₂plasma. The H₂O₂ formation rate can be enhanced by increasing the power density of the H₂/O₂ plasma reactor. The yield and selectivity for propylene oxide (PO) can be increased by optimizing the reaction conditions and using suitable TS-1 catalysts. With a power injection of 3.5 W, flow rates of H₂, O₂, and propylene of 170, 8, and 18 ml/min, respectively, catalyst loading of 0.8 g, and epoxidation temperature of 110 ^oC, the yield and selectivity for PO and the utilization rate of H₂O₂ were 246.9 g/(kg•h), 95.4%, and 36.1%, respectively. During the gas phase reaction, no decline of TS-1 activity was observed.