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CVOCs催化燃烧净化取得系列新进展,硫酸根促进的铁基催化剂,发表于Appl Catal A

已有 465 次阅读 2021-3-30 09:17 |个人分类:科研点滴启发|系统分类:科研笔记

https://www.sciencedirect.com/science/article/pii/S0926860X21001320

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夏航琦,戴启广,王幸宜

恭喜夏博士第二篇ACA发表(可以顺利毕业了

由于各种原因导致夏博士的论文几乎全是自己亲手打造,实属不容易

Highlights

Catalyst 30FT-S is highly active and stable for oxidative decomposition of chlorobenzene.

Ti3+-oxygen vacancy is contributed from the electron transfer from Fe3+ to Ti4+ in Fe-O-Ti structure and the incorporation of S4+ into the surface lattice.

The reaction activity for chlorobenzene is positively related to the amount of chemisorbed oxygen/oxygen vacancy.

Chlorobenzene adsorbs on a pair of adjacent Lewis acid sites through the π cloud and the Cl atom over the iron titanate catalysts, with a low apparent activation energy.

Abstract

Iron titanate catalysts with various Fe/(Fe + Ti) ratios were prepared by sol-gel method and investigated in catalytic oxidation of chlorobenzene (CB). The catalysts exhibited good activity and sulfation further promoted the performance in both activity and stability. Ti3+-oxygen vacancy (Vo) was determined with Raman, EPR and O2-TPD, while the generation mechanism of Ti3+-Vo was investigated by XPS and UV-vis. The structure-activity relationship was established between oxygen vacancies (Vo) and CB oxidation. The generation of Ti3+-Vo was attributed from the electron transfer from Fe3+ to Ti4+ in Fe-O-Ti structure as well as the incorporation of S4+ into surface lattice (for the sulfated catalyst). Moreover. the adsorption geometries of CB were comparatively studied. CB adsorbed on a pair of adjacent Lewis acid sites over the iron titanate catalysts through the Cl atom and the π cloud. CB of this adsorption type was highly activated and essentially contributed to the high activities.


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