LAUSR

Abstract Introduction of surface oxygen vacancy (Vo) has been proved to be a powerful method to promote the performance of H2S selective oxidation by improving H2S adsorption and O2 activation. Nevertheless, maximizing the oxygen vacancy concentration remains a challenge due to limited exposed surface. Herein, we report a Fe-doped TiO2-x ultrathin nanosheet with abundant oxygen vacancies for H2S selective oxidation via a facile citric acid assisted hydrothermal process. One of the cheapest and most abundant metals, iron, is a desirable dopant for further promoting the H2S oxidation activity of TiO2. As a result, the Fe-doped TiO2-x nanosheets endowed with abundant oxygen vacancies exhibited nearly 100% sulfur selectivity and H2S conversion at 210 °C and is superior to most reported Ti-based materials. Furthermore, through in situ DRIFTS, in situ Raman and EPR spectra of H2S oxidation, the reaction pathway in selective oxidation of H2S is revealed. The density functional theory (DFT) calculation was conducted to get a deeper insight into the effect of Fe-doping on the electronic structure and oxygen vacancy of defected TiO2.