甲苯甲醇烷基化合成对二甲苯催化剂研究进展

甲苯甲醇烷基化是新型高选择性合成对二甲苯的方法，可以解决石化行业甲苯和甲醇过剩问题，具有较高的工业开发价值。在具有B酸中心及特殊孔结构的分子筛催化下，甲苯甲醇发生苯环上亲电取代反应得到对二甲苯。甲苯甲醇烷基化催化剂主要有Y沸石催化剂、SAPO及MCM-22和ZSM-5分子筛催化剂等，研究较多的是ZSM-5分子筛催化剂。通过对ZSM-5分子筛进行金属、非金属或复合改性后，可以显著提高烷基化反应转化率和选择性。未来研究的主要目标是获得选择性高且稳定性好的催化剂。

Research progress in the catalysts for toluene alkylation with methanol to para-xylene

Toluene alkylation with methanol is a new highly selective method for the synthesis of p-xylene,which can solve the problem of excess toluene and methanol,and is valuable for commercial development.Over the zeolite catalysts with B acid sites and special pore structure,there is an electrophilic substitution reaction between toluene and methanol to p-xylene.The catalysts for the alkylation of methanol and toluene included mainly Y,SAPO,MCM-22 and ZSM-5 zeolite catalysts.More researches on ZSM-5 zeolite catalysts were carried out.By modifing ZSM-5 zeolite with metal,nonmetal or composite,the conversionand selectivity of the alkylation reaction could be improved significantly.The main goal of research on the catalysts in the future is how to get the catalysts with high selectivity and stability.