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

Abstract

In this paper, black TiO2 without adding active component 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, EPR, XPS, H2-TPR, DFT and NH3-TPD were carried out to study the structure-effectiveness relationship. We found that a large number of oxygen vacancies were formed over black TiO2 surface. It was not only promoted the adsorption of NH3 via direct (oxygen vacancies as Lewis acid sites for NH3 adsorption) and indirect (oxygen vacancies promote the formation of surface hydroxyl, which is Brønsted acid sites for NH3 adsorption) form, 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, 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 black TiO2 catalyst were studied, and it showed good performances. We expect this work would contribute to the better design of a cost-effective and environmentally friendly NH3-SCR catalyst.

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Publication details

The article was received on 10 Apr 2018, accepted on 09 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP02270D
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Study on the NH3-SCR performance and reaction mechanism of cost-effective and environment-friendly black TiO2 catalyst

    Y. Zeng, Y. Wang, S. Zhang and Q. Zhong, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP02270D

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