非热等离子体条件下丙烯气相环氧化

Vapor-phase epoxidation of propylene via non-equilibrium plasma

研究了介质阻挡放电等离子体对分子氧和丙烯直接合成环氧丙烷(PO)的活化作用.丙烯、氧等离子体是在室温和大气压下、在筒(线)-筒式反应器中通过介质阻挡放电产生的.实验中主要考察了输入功率在3种不同体系中分别对丙烯转化率、PO选择性的影响.反应物及各产物通过在线色谱法进行分析.实验数据表明:在室温和大气压下,用介质阻挡放电法可转化丙烯和氧气直接生成PO.在总反应气流速为160.8mL/min,输入功率为4.6W,V(C3H6)∶V(O2)=1∶200的条件下,丙烯转化率及PO的选择性分别为>80%和>30%.H2和TS-1催化剂的加入有利于增加PO在有机氧化产物中的选择性.

The role of plasma activation in the vapor phase epoxidation of propylene using molecular oxygen/and hydrogen with TS-1 was studied for the first time. The plasma was obtained by applying dielectric barrier discharge （DBD） to the mixture of oxygen and propylene at room temperature and atmospheric pressure. Authors have successfully demonstrated that synthesis of PO form C3 H6 and O2 in DBD plasma and observed the effect of input power on the propylene epoxidation under different reaction systems. When input power is 4.6 W, O2/C3 H6 molar ratio is 200/1, flow velocity of the mixture of O2 and C3H6 is 160.8 mL/min, the conversion of propylene and the selectivity of PO are 80% and 〉30%, respectively. Adding of H2 and TS-1 is in favor of the selectivity of PO in organic oxidated products.