Methodology for Simultaneous Analysis of Photocatalytic deNO(x) Products

0558893 - ÚFCH JH 2023 RIV CH eng J - Článek v odborném periodiku
Suchánek, Jan - Vaněčková, Eva - Dostál, Michal - Mikysková, Eliška - Brabec, Libor - Žouželka, Radek - Rathouský, Jiří
Methodology for Simultaneous Analysis of Photocatalytic deNO(x) Products.
Catalysts. Roč. 12, č. 6 (2022), č. článku 661. E-ISSN 2073-4344
Grant CEP: GA ČR(CZ) GA19-12109S; GA MŠMT(CZ) EF16_013/0001821
Grant ostatní: GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_013/0001821; AV ČR(CZ) MSM200402101; AV ČR(CZ) StrategieAV21/23
Program: Program na podporu mezinárodní spolupráce začínajících výzkumných pracovníků; StrategieAV
Výzkumná infrastruktura: NanoEnviCz II - 90124
Institucionální podpora: RVO:61388955
Klíčová slova: photocatalysis * air purification * NOx * hono * no2 * mass balance
Obor OECD: Physical chemistry
Impakt faktor: 3.9, rok: 2022
Způsob publikování: Open access

The ISO standard 22197-1:2016 used for the evaluation of the photocatalytic nitric oxide removal has a main drawback, which allows only the decrease of nitric oxide to be determined specifically. The remaining amount, expressed as ´´NO2´´, is considered as a sum of HNO3, HONO NO2, and other nitrogen-containing species, which can be potentially formed during the photocatalytic reaction. Therefore, we developed a new methodology combining our custom-made analyzers, which can accurately determine the true NO2 and HONO species, with the conventional NO one. Their function was validated via a photocatalytic experiment in which 100 ppbv of either NO or NO2 dispersed in air passed over (3 L min(-1)) an Aeroxide (c) TiO2 P25 surface. The gas-phase analysis was complemented with the spectrophotometric determination of nitrates (NO3-) and/or nitrites (NO2-) deposited on the P25 layer. Importantly, an almost perfect mass balance (94%) of the photocatalytic NOx abatement was achieved. The use of custom-made analyzers enables to obtain (i) no interference, (ii) high sensitivity, (iii) good linearity in the relevant concentration range, (iv) rapid response, and (v) long-term stability. Therefore, our approach enables to reveal the reaction complexity and is highly recommended for the photocatalytic NOx testing.
Trvalý link: http://hdl.handle.net/11104/0332389