氧化镁改性微米TS-1催化丙烯环氧化

合成了粒径在1~2 μm的廉价微米TS-1，并经MgO改性，杀灭其上少量的酸中心；采用SEM、XRD、BET对MgO改性前后的TS-1进行了表征，并考察了其在甲醇溶剂体系丙烯环氧化的催化性能。结果表明，TS-1催化剂经MgO改性后，可以显著提高其催化丙烯环氧化反应的环氧丙烷(PO)选择性，减少副反应的发生；在最优化反应条件CH₂O₂ =1.0 mol/L, θ = 60℃, t = 60 min, p_C3↓H6↓ = 0.6 MPa，以及按每1 gTS-1需80 mL CH₃OH的比例下，H₂O₂转化率达到99.5%，环氧丙烷选择性达到96.7%，环氧丙烷收率比未改性的微米TS-1也有明显提高。

Propylene Oxidation Over MgO Modified Micro TS-1

Micro TS-1 with the size of 1-2 μm was synthetized, and modified with MgO to kill the acid sites on the catalyst. The samples were characterized with SEM, XRD and BET. The catalytic performance of the modified TS-1 for propylene epoxidation reaction with methanol as solvent was studied. The results showed that with the TS-1 modified by MgO as catalyst the propylene epoxide (PO) selectivity of propylene epoxidation could be significantly improved, and the byproduct generate rate was reduced. Under the optimal reaction conditions of C_H2↓O2↓=1.0 mol/L, θ= 60℃, t =60 min, p_C3↓H6↓ =0.6 MPa, and V_CH3↓OH/m _TS-1=80mL/g_,, the hydrogen peroxide conversion was 99.5%, propylene epoxide selectivity was 96.7%, and propylene epoxide yield was higher than that over unmodified micro TS-1.