NDLI: Photocatalytic removal of nitrogen oxides from air on TiO$

Content Provider	Springer Nature Link
Author	Shelimov, B. N. Tolkachev, N. N. Baeva, G. N. Stakheev, A. Yu. Kazanskii, V. B.
Copyright Year	2011
Abstract	The efficiency of TiO$_{2}$ (Degussa P-25) modified with an alkaline admixture (urea, BaO), sulfuric acid, or platinum in the photocatalytic oxidation of NO (50 ppm) with a flowing 7% O$_{2}$ + N$_{2}$ mixture under UV irradiation in a flow reactor at room temperature and atmospheric pressure is reported. Because of the progressive blocking of active sites of the photocatalyst by the reaction products (NO$_{2}$, NO 3 − ), it is impossible to realize prolonged continuous removal of NO$_{ x }$ (NO + NO$_{2}$) from air without catalyst regeneration at elevated temperatures. The efficiency of the photocatalysts is characterized by specific photoadsorption capacity (SPC) calculated from the total amount of NO$_{ x }$ adsorbed during 2-h-long irradiation. Modification of TiO$_{2}$ with 5% BaO or 5% urea raises the SPC of the catalyst by a factor of 2–3. Presumably, this promoting effect is due to the basic properties of these dopants, which readily sorb NO$_{2}$ and NO 3 − . A considerable favorable effect on SPC is also attained by adding 0.5% Pt to (5% BaO)/TiO$_{2}$. The SPC of the (0.5% Pt)/TiO$_{2}$ catalyst depends on the state of the platinum. The samples calcined in air at 500°C, which contain Pt$^{+}$ and Pt$^{2+}$, have an approximately 2 times higher SPC than unpromoted TiO$_{2}$ and ensure a much larger NO$_{2}$/NO ratio at the reactor outlet. Conversely, the samples reduced in an H$_{2}$ atmosphere at 200°C, whose platinum is in the Pt0 state, show a lower SPC than the initial TiO$_{2}$ and cause no significant change in the NO$_{2}$/NO ratio.
Starting Page	518
Ending Page	524
Page Count	7
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	52
Issue Number	4
e-ISSN	16083210
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-08-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalysis Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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