甲苯-甲醇侧链烷基化制取苯乙烯的研究Ⅱ.KX/KZSM-5改性双沸石催化剂上的侧链烷基化反应

INVESTIGATION ON SIDE CHAIN ALKYLATION OF TOLUENE WITH METHANOL FOR SYNTHESIS OF STYRENE Ⅱ. SIDE CHAIN ALKYLATION ON MODIFIED KX/KZSM-5 BIZEOLITE CATALYSTS

本文研制了一系列用酸组分(H_3BO_3或H_3EO_4)和碱组分(KOH或LiOH)共同改性的KX/KZSM-5双沸石催化剂.这些催化剂具有高的侧链烷基化活性和选择性.用NH_3和CO_2的程序升温脱附对一系列催化剂的酸中心和碱中心进行了物性表征,证明了该反应是酸中心和碱中心的协同催化.

A series of novel KX/KZSM-5 bizeolite catalysts modified with both acid component (H_3BO_3 or H_3PO_4) and basic component (K-OH or LiOH) has been developed. The catalysts are found to exhibit high activity and selectivity for side chain alkylation. The reactivities of these catalysts are correlated to their acidities and basicities, which are characterized by TPD technique of absorbed NH_3 and CO_2 respectively. The results show that both a weaker basic site and a weaker acidic site are required to coexist on the catalyst surface for side chain alkyjation.