A_5微孔分子筛负载V_2O_5催化氧化对硝基甲苯  

Catalytic oxidation of 4-nitrotoluene by V_2O_5/A_5 catalyst

作　　者：范宗良[1] 周军荣[1] 钱广[2] 李贵贤[1] 

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]嘉兴学院生物与化学工程学院,浙江嘉兴314001

出　　处：《工业催化》2014年第7期562-565,共4页Industrial Catalysis

基　　金：国家自然科学基金(20903047)资助项目

摘　　要：将A5微孔分子筛浸渍于偏钒酸铵溶液,过滤,120℃干燥2 h,550℃焙烧6 h,制备了含有V2O5的A5微孔分子筛催化剂。采用X射线衍射、N2吸附-脱附和扫描电镜等进行表征,并将其用于以H2O2为氧化剂、乙酸酐为溶剂的对硝基甲苯催化氧化生成对硝基苯甲醇的反应。在反应温度40℃和反应时间4 h条件下,以质量分数35%的H2O2为氧化剂和V2O5质量分数8.5%的V2O5/A5为催化剂,能够获得较好的对硝基甲苯转化率(35.54%)和较高的对硝基苯甲醇选择性(67.16%)。反应结束后,在母液中通过电感耦合等离子体原子光谱仪没有检测到V2O5。V2O5/A5催化剂连续使用3次,对硝基甲苯转化率为34.21%,对硝基苯甲醇选择性为63.39%,催化剂活性无明显降低。V2O5/A5 catalyst was prepared by impregnating A5 microporous molecular sieve in ammonium metavanadate solution,and then filtering,drying at 120 ℃ for 2 h,finally calcining at 550 ℃ for 6 h.V2O5/A5 catalyst was characterized by X-ray diffraction,N2 adsorption-desorption and scanning electron microscope,and was used in the oxidation of 4-nitrotoluene to 4-nitrobenzyl alcohol by using H2O2 as the oxidant and acetic anhydride as the solvent.The results showed that 4-nitrotoluene conversion of 35.54％and the selectivity to 4-nitrobenzyl alcohol of 67.16％ were attained under the condition as follows：reaction temperature 40 ℃,reaction time 4 h,35wt％ H2O2 as the oxidant and V2O5/A5 with V2O5 mass fraction 8.5％ as the catalyst.After reaction,V2O5 was not detected in the mother liquid by ICP.4-Nitrotoluene conversion of 34.21％ and the selectivity to 4-nitrobenzyl alcohol of 63.39％ were obtained after V2O5/A5catalyst was used for 3 times,and the catalyst activity did not decrease obviously.

关 键 词：催化化学 V2O5 A5催化剂 对硝基甲苯 H2O2 催化氧化 对硝基苯甲醇 

分 类 号：O643.36[理学—物理化学] TQ246.1[理学—化学]