轻烃芳构化的系统研究(Ⅰ)——混合碳四和正己烷在ZnNi/HZSM-5催化剂上的微波芳构化

Systematic Studies on the Aromtization of Light Hydrocarbon (Ⅰ) Mixed C 4、n-Hexane Microwave Aromatization over ZnNi/HZSM-5 Catalyst

研究了混合碳四、正己烷在微波条件下，在锌和镍双金属改性 Ｈ Ｚ Ｓ Ｍ－ ５ 上芳构化反应，考察了反应温度和反应时间对气液相产物分布的影响并与常规加热作了比较，详细探讨了微波芳构化反应机理。实验结果表明：（１） 在反应温度４００ ℃，质量空速１ ．０ ｈ － １ ，以混合碳四为原料，经微波芳构化和常规加热芳构化实验对比，微波芳构化下的芳烃收率提高约１７ ．０８ ％ ， Ｂ Ｔ Ｘ 选择性远远高于常规加热；（２） 从反应温度对性能影响的考察表明，反应温度变化对微波芳构化反应性能的影响比较大。微波芳构化具有加快反应速率，提高选择性和芳烃收率及降低反应温度等优点，是更好的实现择形催化的好方法。

Under the microwave irradiation, aromatization reactions of mixed C4、 n -hexane catalyzed by bimetallic Zn、Ni modified HZSM-5 were studied. The influences of reaction temperature and time on the distributions of gas and liquid phase products were tested. At the same time, microwave aromatization mechanism was put forward and discussed in detail. The microwave aromatization and the conventional aromatization were compared, results showed that: (1) under the operating conditions of temperature 400℃、WHSV=1 h -1 and mixed C 4 as material, approximate 17.08% aromatics yield was elevated and BTX selectivity was also enhanced dramatically; (2) from the influences of reaction temperature on n-hexane microwave aromatization properties, reaction temperature had remarkable effect on the microwave aromatization reaction. Moreover, microwave aromatization obtained not only advantages of high selectivity and good yield, but also those of enhancing reaction rate and lowing reaction temperature, therefore, microwave aromatization is an available method for shape-selective catalysis.