V-Ti-O-Mo催化剂气-固相催化氨氧化合成2-氰基吡啶的研究

Study on V-Ti-O-Mo Catalysts for 2-Cyanopyridine Synthesis via Gas-Solid Ammoxidation

摘要: 用混合法制备了含有五氧化二钒(V₂O₅)、二氧化钛(TiO₂)和三氧化钼(MoO₃)的三元催化剂,用于连续气固相氨氧化2-甲基吡啶合成2-氰基吡啶。结果表明,助催化组分三氧化钼(MoO₃)能提高2-氰基吡啶的选择性,当催化剂组成为8.91%(wt)V₂O₅、85.84%(wt)TiO₂和5.25%(wt)MoO₃时2-氰基吡啶的选择性最好。基于改进后的V-Ti-O-Mo催化剂,对2-甲基吡啶的氨氧化反应工艺条件进行了优化,当反应温度380oC、物料配比1:5:3.3:22(2-甲基吡啶/氨气/水/空气,摩尔比)、空速0.15 h^-1时,2-氰基吡啶收率达到最优值85.6%。

Abstract: A catalyst containing V₂O₅, TiO₂ and MoO₃ was prepared for 2-cyanopyridine synthesis by ammoxidation of 2-picoline under continuous gas-solid phase conditions. Experimental results show that the co-catalyst MoO₃ can improve 2-cyanopyridine selectivity, and the best catalytic composition is 8.91%(wt)V₂O₅, 85.84%(wt) TiO₂ and 5.25%(wt) MoO₃. The reaction condition of 2-cyanopyridine ammoxidation was optimized based on this optimized V-Ti-O-Mo catalyst. When the reaction temperature is 380℃, material ratio is 1: 5: 3.3: 22 (2-methylpyridine/ammonia/water/air, molar ratio) and space velocity is 0.15 h^-1, the highest yield of 2-cyanopyridine is 85.6%.