【摘要】 以醛氨气相合成3,5-二甲基吡啶(DMP)为探针反应,考察了-γA l2O3负载不同金属氧化物催化剂的催化活性。实验结果显示Cr2O3/-γA l2O3对DMP有较好选择性和收率。较优化的反应条件为:Cr2O3/-γA l2O3[w(Cr2O3)=8%]1.0 g,反应温度340℃~400℃,常压,V(醛)∶V(氨)为1∶4~1∶6,V(丙醛)∶V(甲醛)为1∶1~1∶2,GHSV 1200h-1,DMP收率76.1%,丙醛转化率92.7%。更多还原

【Abstract】 The catalytic activity of MO_x/γ-Al₂O₃ was tested by a probe reaction,in which 3,5-dimethylpyridine（DMP） was synthesized from aldehyde and ammonia in vapor phase.The experamental results showed that Cr₂O₃/γ-Al₂O₃ exhibited higher selectivity and yield for synthesis of DMP.The optimal reaction conditions were as follows: Cr₂O₃/γ-Al₂O₃[w（Cr₂O₃）=8%] was 1.0 g,V（aldehyde） ∶V（ammonia） was（1 ∶）4～1 ∶6,V（propionaldehyde） ∶V（formaldehyde） was（1 ∶）1～1 ∶2,GHSV was 1200 h^-1,the yield of DMP was 76.1% and the conversion of propionaldehyde was（92.7%） under normal pressure at 340 ℃～400 ℃.更多还原