改性纳米ZSM-5催化剂上甲苯与碳酸二甲酯选择甲基化合成对二甲苯

 以（6%SiO₂+5%P₂O₅+3%MgO）/纳米 ZSM-5 为催化剂，在固定床反应器中，考察了甲苯(T)与碳酸二甲酯（DMC）甲基化合成对二甲苯（PX）的反应性能，特别是反应温度、水和甲苯与 DMC 摩尔比对反应性能的影响，并与甲醇（M）用作烷基化试剂的反应进行了对比。结果表明，DMC 为烷基化试剂时，PX 选择性达 97%，反应 40 h 后，催化剂很快失活。采用热重和紫外拉曼光谱对反应70 h 后的催化剂进行表征，发现用 DMC 作烷基化试剂时，催化剂积炭量较大，反应中引入水能在某种程度上减缓积炭的生成。

Shape-Selective Methylation of Toluene With Dimethyl Carbonate Into p-Xylene Over Modified Nano-Scale HZSM-5 Catalyst

Shape-selective methylation of toluene(T) with dimethyl carbonate(DMC) into p-xylene(PX) was carried out in a continuous flow fixed-bed reactor over(6%SiO2+5%P2O5+3%MgO)/nano-scale ZSM-5 catalyst.The influences of various reaction conditions,including reaction temperature,water and T/DMC molar ratio,on the reaction conversion and PX selectivity were investigated.The catalytic performances of catalyst in the methylation reaction with DMC and methanol as alkylation agent were compared.The results showed that ...