助剂钾对V_2O_5-Ag_2O催化氧化甲苯制苯甲醛的研究  

Study of Potassium Doping on the Properties of V_2O_5-Ag_2O Catalysts in Gas Phase Catalytic Oxidation of Toluene to Benzaldehyde

作　　者：刘伟华[1] 张同来[1] 伍涛[1] 

机构地区：[1]北京理工大学机电工程学院爆炸灾害预防与控制国家重点实验室,北京100081

出　　处：《化工生产与技术》2004年第6期14-16,43,共4页Chemical Production and Technology

摘　　要：制备了 V_2O_5-Ag_2O-K_O/Al_2O_3-MgO 和 V_2O_5-Ag_2O-K_2O/Al_2O_3-USY 用于甲苯气相催化氧化制苯甲醛，研究助剂 K 对催化剂作用的影响，研究表明：K 有助于降低亲电子氧(O^-、O_2^-)的含量，而亲电子氧是甲苯过度氧化的氧源，同时也阻止甲苯上甲基的断裂；提高甲苯氧化的选择性，阻止甲苯上甲基的断裂，使苯的生成减少。K 有助于亲核氧(O^(2-))的生成，加快催化氧化过程。X 衍射图谱分析表明，过量 K 易形成无活性的KVO_3，不利于催化过程。V_2O_5-Ag_2O-K_2O/Al_2O_3-MgO and V_2O_5-Ag_2O-K_2O/Al_2O_3-USY are prepared to be used in gaseous phase catalyticoxidation of toluene to benzaldehyde;the product during toluene oxidation by the oxygen present in the catalyst is compared for K-dopedand non-doped samples.Studies have shown:K contributes to reduce the surface concentration of electrophilic oxygen(O^-,O^2-),which is usually responsible for the deep oxidation,prevents the fracture of the methyl on the toluene,reduces the benzene formulation;a higher concentration of nucleophilic oxygen(O^2-),responsible for the partial oxidation of toluene;raises selectivity for benzaldehyde,but at a high concentration of potassium,the active vanadium species would transform into inactive KVO_3.

关 键 词：甲苯 苯甲醛 甲基 助剂 V2O5 催化过程 气相催化氧化 含量 过量 X衍射图谱 

分 类 号：TQ245[化学工程—有机化工]