摘要
采用混合研磨法制备了一系列锡基混合氧化物催化剂(Sn-M,M=La,V,Ce,Fe,Nb,Sb,Al,Mn,Ti)。以65%～68%HNO3为硝化剂,研究了Sn-M催化苯液相硝化合成硝基苯的反应,结果表明Sn-Al具有最好的催化活性。采用NH3-TPD和Py-IR法测量了不同锡铝比[r=n(Sn)∶n(Al)]的Sn-Al催化剂的表面酸性质,结果表明适量的铝可提高Sn-Al催化剂的催化活性,最佳r=1∶8。在最佳反应条件[苯18 mL,V(硝酸)∶V(苯)=2,于75℃反应7 h]下,硝基苯产率85.5%,选择性100%。Sn-Al(r=1∶8)催化剂重复使用5次,活性基本无变化。
A series of Sn-M oxide catalysts（M=La,V,Ce,Fe,Nb,Sb,Al,Mn,Ti） were prepared by mixture-grinding method.The catalytic activities of Sn-M were investigated in the liquid-phase nitration of benzene using 65%HNO3 as the nitrating agent.The results showed that Sn-Al catalyst exhibited the highest catalytic activity.The surface acid properties of Sn-Al catalysts of different r[n（Sn） ∶n（Al）] were characterized by NH3-TPD and Py-IR.The results showed that the suitable aluminum content can increase the catalytic activity of Sn-Al catalyst.The optimized r was 1 ∶8,and nitrobenzene yield reached 85.5% with 100% selectivity under optimal reaction conditions[ benzene 18 mL,V（HNO3） ∶V（benzene）=2.0,at 75 ℃ for 7 h].The Sn-Al（r=1 ∶8） catalyst showed no obvious decrease in activity after being used for five reaction cycles.
出处
《合成化学》
CAS
CSCD
北大核心
2010年第4期441-445,共5页
Chinese Journal of Synthetic Chemistry
基金
乐山师范学院科研项目(20974)
