Abstract: A novel C₈ aromatics isomerization catalyst was prepared using a special structured zeolite as the acid component，its catalytic activity and selectivity for xylene isomerization was studied. A commercial catalyst used currently was selected as a contrast catalyst for the evaluation under each preferable reaction conditions respectively. With different stuff，the PX value in the xylene products obtained over the novel catalyst was 19.06%－24.14%，the ethylbenzene conversion was 32.07%－41.50%，the C₈ hydrocarbon yield was 97.08%－99.11%. These results were all substantially higher than those obtained over the contrast catalyst. Meanwhile，the toluene value of the novel catalyst was 0.26%－1.20%，C₉ or heavier aromatics value was 0.22%－0.62%，they were both much lower than those of the contrast catalyst. Thus，the prepared novel catalyst has better catalytic activity and selectivity for C₈ aromatics isomerization，and it can be operated under higher WHSV (weight hourly space velocity).

摘要： 选用独特结构的分子筛材料为酸性组元，制备了新型碳八（C8）芳烃异构化催化剂，并对该催化剂的异构化能力进行了研究。选取目前工业用催化剂作为对比催化剂，采用相同的反应原料，在各自最佳的反应条件下，与新型催化剂进行比较。实验结果表明，随着原料的不同，在反应产物中，新型催化剂反应中的对二甲苯在二甲苯中的浓度为19.06%～24.14%，乙苯转化率为32.07%～41.50%，C8烃收率为97.08%～99.11%，远高于对比催化剂；同时，甲苯含量为0.26%～1.20%，重芳烃含量为0.22%～0.62%，远低于对比催化剂。同对比催化剂相比，新型催化剂具有较高的异构化活性和选择性，能在较高的空速下运行。