文献类型：期刊文献

英文题名：Characterization of Fresh, Deactivated, and Regenerated TS-1 for Propylene Epoxidation: Investigating Surface Deactivation Species

作者：Wang, Yue[1];Li, Ting[2];Bao, Xiaohui[3];Ma, Hongxi[2];Zhao, Jigang[1,3]

机构：[1]East China Univ Sci & Technol, Int Joint Res Ctr Green Energy Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shanghai Shenglanhui Technol Co Ltd, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：9

期号：41

外文期刊名：CHEMISTRYSELECT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001353341600001)】；

语种：英文

外文关键词：Coke species; Deactivation; Propylene epoxidation; Soxhlet extraction; Titanium silicalite-1

摘要：Titanium silicalite-1 (TS-1) serves as an effective catalyst for propylene epoxidation in the hydrogen peroxide propylene oxide (HPPO) process, attracting wide attention from researchers and industry. Nonetheless, the TS-1 catalyst experienced inevitable deactivation during industrial applications, which adversely impacts its lifespan. To enhance reaction stability of catalyst, the present work conducted a systematic investigation into the deactivation reason of the TS-1 catalyst. The fresh, deactivated, and regenerated catalysts were characterized by using various analytical techniques to compare their physicochemical properties. The surface coke species of the deactivated catalysts were extracted by the Soxhlet extraction method and subsequently analyzed using GC-MS. Additionally, the pathways for by-product formation were simulated through Gauss software. The results indicated that the so-called coking deposits formed during the reaction predominantly consist of propylene glycol, ethers, and oligomers. These coke species covered the partial active sites on the catalyst surface, blocked the pores of the catalyst, and accordingly led to the deactivation of the catalyst, although the crystalline structure of the catalyst hardly changed after deactivation. These results provide a theoretical basis and novel insights for the rational design and development of efficient catalysts for the HPPO process.