A study on the NH3 -SCR performance and reaction mechanism of a cost-effective and environment-friendly black TiO2 catalyst

Physical Chemistry Chemical Physics : PCCP
Yiqing ZengQin Zhong

Abstract

In this paper, black TiO2 without adding active components was developed for NH3-SCR-DeNOx. The catalytic activity tests showed that the NO removal efficiency of black TiO2 was always greater than 90% at 330-390 °C, which almost reached that of the commercial NH3-SCR-DeNOx catalyst. XRD, UV-vis, TG, EPR, XPS, H2-TPR, DFT and NH3-TPD analyses were carried out to study the structure-effectiveness relationship. We found that a large number of oxygen vacancies were formed over the black TiO2 surface. It was not only promoted the adsorption of NH3via direct (oxygen vacancies as Lewis acid sites for NH3 adsorption) and indirect (oxygen vacancies promote the formation of surface hydroxyl groups, which are Brønsted acid sites for NH3 adsorption) forms, but also improved the redox properties by promoting the reduction of Ti4+ to Ti3+. These changes lead to the superior catalytic activity of black TiO2 for NH3-SCR-DeNOx. Additionally, an in situ DRIFT study demonstrated that the NH3-SCR-DeNOx reaction over black TiO2 occurred via the Eley-Rideal (E-R) mechanism. Finally, the catalytic stability and resistance to H2O and SO2 of the black TiO2 catalyst were studied, and it showed good performances. This study offered new and important insi...Continue Reading

References

Dec 14, 2002·Science·Renald SchaubFlemming Besenbacher
Jul 21, 2006·The Journal of Physical Chemistry. B·Xue-Qing Gong, Annabella Selloni
Jun 4, 2008·Physical Review Letters·Greg A Kimmel, Nikolay G Petrik
Nov 23, 2010·Environmental Science & Technology·Liang ChenMaofa Ge
Dec 17, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Shunhang WeiYanfei Sun
Jan 16, 2015·Chemical Society Reviews·Xiaobo ChenFuqiang Huang
Jan 1, 2005·Journal of Chemical Theory and Computation·A S BarnardL A Curtiss

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