陶瓷膜反应器中环己酮氨肟化的催化剂失活机制与再生

发布时间：2018-04-30 19:52

  本文选题：环己酮肟 + TS-分子筛　； 参考：《化工学报》2017年05期

【摘要】：基于陶瓷膜反应器开发出无有机溶剂的环己酮氨肟化新工艺,探讨TS-1催化剂失活机制。采用XRD及Rietveld全谱拟合、FT-IR、N_2吸附-脱附、TGA/DSC、GC-MS等手段对TS-1分子筛的骨架结构、晶胞参数、比表面积和有机物种类进行了表征分析。结果表明,无有机溶剂的环己酮氨肟化反应过程中,存在硅流失的现象,但TS-1骨架完整,晶胞参数未明显变化;环己酮、环己酮肟及反应副产物等吸附在TS-1催化剂的表面及孔道内,使比表面积下降52.6%、孔体积减少了41.6%,是造成TS-1失活的主要原因,空气氛围中于600℃煅烧3 h,可以恢复催化剂的活性。
[Abstract]:Based on ceramic membrane reactor, a new process of ammoximation of cyclohexanone without organic solvent was developed, and the deactivation mechanism of TS-1 catalyst was discussed. The skeleton structure, unit cell parameters, specific surface area and organic species of TS-1 molecular sieve were characterized by means of XRD and Rietveld full-spectrum fitting, such as FT-IRN _ 2 adsorption-desorption and TGA / DSC-GC-MS. The results showed that there was silicon loss in the ammoximation of cyclohexanone without organic solvent, but the TS-1 skeleton was intact and the unit cell parameters did not change obviously, cyclohexanone, cyclohexanone, cyclohexanone, cyclohexanone, cyclohexanone, Cyclohexanone oxime and by-products were adsorbed on the surface and pore channels of TS-1 catalyst, which reduced the specific surface area and pore volume by 52.6 and 41.6 respectively, which were the main causes of TS-1 deactivation. The activity of the catalyst could be restored after calcined at 600 鈩，

本文编号：1825960