• 作者： Chen, Wen-Shing; Chiang, Heng-Bo; Lee, Min-Dar
• 中文摘要： 在含有不同釩鉬比例之二元氧化物觸媒上進行甲苯之氨氧化反應,由觸媒之組成與活性之關係得知,釩鉬比為2/1者,對於苯甲之生成表現最佳之催化性能,選擇率可達90%。經XRD、IR及TPR等試驗,其活性可歸因於Mo/sub 6/V/sub 9/ O/sub 40/化合物之形成,而活性中心則為雙鍵氧 V=O。純MoO/sub 3/相對於甲苯之氨氧化反應並不具活性。甲苯在觸媒上先經氧化吸附而生成苯甲醛,再進一步氧化成為benzoate離子後,與被吸附之氨反應而產生苯甲; 甲苯至二氧化碳之全氧化則同時依另一途徑進行。
• 英文摘要： The catalytic behaviors of vanadium-molybdenum binary oxides in the ammoxidation of toluene were investigated. Correlation of the catalyst composition and activity demonstrated that V/Mo mole ratio of 2/1 was most effective for benzonitrile formation and the selectivity reached a level as high as ca.90%. The effective performance might be attributed to the formation of Mo/sub 6/V/sub 9/O/sub 40/ compound, wherein the double bond oxygen species V=O on the surface were thought to be the active sites as confirmed from the systematic studies of X-ray diffraction (XRD), temperature programmed reduction (TPR) and infrared spectroscopy (IR). The pure molybdenum trioxide was found to be entirely inactive. As regard to the reaction mechanism, the selective oxidation of toluene to benzaldehyde was postulated to have occurred first, which was thought to be the rate-determining step during the course of reaction. The benzonitrile was produced by the reaction between ammonia and further oxidative product, benzoate ion. The complete oxidation of toluene to carbon dioxide proceeded simultaneously via another reaction route.
• 中文關鍵字： 氨氧化; 苯甲; 甲苯; 釩鉬二元氧化物; 催化性能
• 英文關鍵字： Ammoxidation; Benzonitrile; Toluene; Vanadium-Molybdenum Binary Oxide; Catalyst Characterization