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含能材料  2008 

介孔分子筛负载SO3H基区域选择性催化硝化邻二甲苯

Keywords: 物理化学,MCM-41分子筛,磺酸,3,4-二甲基硝基苯,区域选择性催化,硝化

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Abstract:

采用直接合成法制备出由MCM-41介孔分子筛负载SO3H的催化剂,探讨了催化剂表面的酸中心组成,并考察了不同工艺条件下邻二甲苯区域选择性硝化的催化性能。用硫酸钡重量法、透射电镜(TEM)和N2吸附-脱附表征了MCM-41-SO3H的结构。结果表明,MCM-41-SO3H保持了MCM-41的介孔结构,BET表面积高达560m2·g-1,表面含有质子酸中心;得到最宜的工艺条件:催化剂焙烧温度290℃,反应温度65℃,m邻二甲苯/m催化剂=27,n硝酸/n邻二甲苯=2.5,反应时间3h,邻二甲苯转化率为92.4%,3,4-二甲基硝基苯的含量达到83.3%。

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