Liquid-phase oxidation of ethylamine to acetaldehyde oximes over tungsten-doped zeolites

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2017,（7）
• 页码范围: 942-949
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s11426-016-0480-y

摘要

The liquid-phase oxidation of ethylamine with hydrogen peroxide was studied over tungsten-doped zeolites to develop a clean and simple route for producing acetaldehyde oxime.The investigations were firstly performed over W/MOR,where the coordinated state as well as the acidity of the W species were characterized.The reaction parameters,including H2O2 amount,solvent,temperature,tungsten content as well as catalyst amount,governed the activity and oxime selectivity.Under optimized reaction conditions,W/MOR showed an ethylamine conversion and corresponding oxime selectivity of 18.3％ and 88.9％.W/MOR showed a superior performance in comparison to other tungsten-containing zeolites of W/Beta,W/MWW and W/Y.Although W/MOR exhibited lower amine conversion than titanosilicates of TS-1 and Ti-MWW,it gave higher selectivity to the main product ofoxime.Moreover,W/MOR proved to be a robust catalyst,exhibiting a stable catalytic performance after being reused at least for 5 times.