Exploring high selective catalysts via fabrication of oxygen vacancy on TiO2_rutile vs tourmaline
2022-08-14 12:06:13

June 15, 2022

Exploring high selective catalysts via fabrication of oxygen vacancy on TiO2

by Zhang Nannan, Chinese Academy of Sciences

Exploring high selective catalysts via fabrication of oxygen vacancy on TiO2
Schematic illustration of primary C–H bond oxidation of toluene. Credit: Chen Cheng et al.

Oxygen vacancy (Ov) significantly influences the oxidation process through oxygen adsorption and activation. Element doping can fabricate oxygen vacancy on titanium dioxide (TiO2), but the effects of the dopants on the oxidation reaction over oxygen vacancy remain unclear.

A research team from the Research Center for Eco-Environmental Sciences of the Chinese Academy of Sciences has recently fabricated oxygen vacancy by doping nitrogen into anatase TiO2. Their results were published in Cell Reports Physical Science.

To fabricate oxygen vacancy with different structures, the researchers doped nitrogen (N) and boron (B) into anatase TiO2(N-TiO2and B-TiO2). Both N-–Ti3+–Ovand Ti3+–Ovwere observed in N-TiO2, but only Ti3+–Ovin TiO2and B-TiO2. The results showed that N-–Ti3+–Ovis more reactive than Ti3+–Ovin O2activation.

In addition, the N-–Ti3+–Ovactive sites formed in N-TiO2significantly enhance the thermal yield and selectivity of the oxidation of the primary C–H bonds in toluene.

The adsorption and activation of O2are the rate-limiting step in the selective oxidation of primary C–H bonds in toluene. N-–Ti3+–Ovas electron donors contributed to a rapid formation of superoxygen species (·O2-), which demonstrated to be active oxygen for primary C–H bond oxidation.

The fabrication of N-–Ti3+–Ovsites opens a new avenue for dopants to improve the oxygen vacancy reactivity and enhance the primary C–H oxidation selectivity.

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More information:Cheng Chen et al, Electron-donating N-–Ti3+–Ovinterfacial sites with high selectivity for the oxidation of primary C–H bonds, Cell Reports Physical Science(2022). DOI: 10.1016/j.xcrp.2022.100936 Journal information:Cell Reports Physical Science

Provided by Chinese Academy of Sciences Citation: Exploring high selective catalysts via fabrication of oxygen vacancy on TiO2 (2022, June 15) retrieved 15 June 2022 from https://phys.org/news/2022-06-exploring-high-catalysts-fabrication-oxygen.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. 10 shares
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