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异丁烯选择氧化制备甲基丙烯醛催化剂
Authors
张海朗
张锁江
+3 more
王茜
田伟
闫瑞一
Publication date
1 January 2008
Publisher
Abstract
采用共沉淀法制备了掺杂Sb的Mo—Bi-Fe—Co—Cs—Ce—K—O混合氧化物催化剂,并将该催化剂用于异丁烯(1B)选择氧化制备甲基丙烯醛(MAL);采用X射线衍射和BET法对催化剂进行了表征,并在固定床反应器中考察了Sb添加量、气态空速、V(IB):V(空气)对催化剂性能的影响。实验结果表明,掺杂Sb的Mo—Bi—Fe—Co—Cs—Ce—K—O催化剂的成分为CoMoO4,Bi2Mo3O12,FeMoO4,Bi2Mo2O9;Sb的掺杂改变了Bi2Mo3O12的晶体结构,进而影响催化剂的性能,抑制了产物MAL的过度氧化,提高了MAL的收率。当n(Sb):n(Mo)=0.03时,催化剂的性能最好,此时催化剂的组成为Mo12Bi1.6Fe1Co8Ce0.4·Cs0.4K0.2Sb0.36,在该催化剂用量5mL、反应温度380℃、气态空速4500h^-1、V(IB):V(空气)=6:94的最优反应条件下,IB的转化率为95.3%,MAL的选择性和收率分别为71.7%,68.3%
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Last time updated on 05/12/2019