Nanocomposites and nanomaterials
The latest Cu-V-Mo/TiO2 catalysts for NO2 reduction
Kontseva M.V.1, Dontsova T.A.1
1 Faculty Of Chemical Technology Igor Sikorsky Kyiv Polytechnic Institute. Prospect Peremogi, 37, Kyiv- 03056, Ukraine. 
E-mail: marishka95@ukr.net
Pollution of the environment by nitrogen oxides has become one of the major problems in the world. The sources of their entry into the atmosphere are industrial emissions due to the combustion of hydrocarbons at low temperatures, combustion processes in power plants or car engines, and natural phenomena.
These gases cause several environmental problems and can cause many health hazards. That is why NOx emissions should be controlled and minimized. One of the nitrogen oxides reducing emissions possible methods is their selective catalytic reduction to nitrogen [1]. However, existing commercial catalysts have some disadvantages, such as a fairly narrow temperature range and high reduction temperature. Therefore, the development of new more efficient NOx reduction catalysts is an urgent issue. 
Based on the analysis of the authors' works [2,3], it was concluded that the combination of V2O5, as a standard NOx reduction catalyst used in industry, with CuO and MoO3 is quite promising. Prospects are explained by the high study of the V2O5 catalytic properties in NOx reduction processes, the ability of CuO to increase the amount of surface adsorbed gases with enhancing the reactivity, and the ability of MoO3 to increase catalytic activity and resistance to H2O and SO2.
In this study, several catalysts based on titanium oxide (IV) with different ratios of active components (Mo, V, Cu) were synthesized. The catalytic activity of the synthesized catalysts in the reactions of NO2 reduction with its initial concentration in the gas mixture at the level of 433 ppm was revealed and characterized. In the process of catalytic selective reduction at low temperatures (100-200 °C), they showed catalytic activity, which amounted to an 80% reduction of NO2 at 190 °C. The revealed fact gives grounds to claim that Cu-V-Mo/TiO2 catalysts are perspective for use in processes of reduction of nitrogen oxides.

1.	Gholami F. Technologies for the nitrogen oxides reduction from flue gas // Science of the Total Environment –2020. – 714. – P. 1–26.
2.	Xua J. Development of vanadium-based catalysts for selective catalytic reducing of NOx // Chemical Engineering Journal– 2018.– 353.– P. 507–518.
3.	Wanga Z.The enhanced performance of Sb-modified Cu/TiO2 catalyst for selective catalytic reduction of NOx with NH3 // Applied Surface Science – 2019. – 475 – P. 334 – 341.