负载型磷钨酸催化苯气相硝化

Study on the Vapor Phase Nitration of Benzene over Supported Phospho-Tungstic Acid Catalysts

研究了负载型磷钨酸对苯气相硝化反应的催化活性 ,探讨了载体、反应温度、杂多酸负载量、苯 硝酸摩尔比对硝化率的影响。试验表明 ,H3PW1 2 O40 SiO2 催化剂对苯气相硝化反应具有很好的催化活性 ,在苯 硝酸摩尔比为 2、反应温度 15 5～ 16 0℃时 ,硝基苯产率可达 90 6 %

Catalytic activities of supported phospho-tungstic acid catalysts in the vapor phase nitration of benzene were studied The effects on nitration of supports,reaction temperatures,loading amount of hetero-polyacid and molar ratio of benzene to HNO 3 were also investigated The results show that H 3PW 12 O 40 /SiO 2 is an excellent catalyst for the vapor phase nitration of benzene, and the optimum reaction conditions are: molar ratio of benzene to HNO 3,2∶1 and reaction temperature, 155～160 ℃ Under above conditions, the yield of nitrobenzene based on HNO 3 is 90 6% [