Photocatalytic NOx abatement: The effect of high air flow velocity

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F22%3A00559887" target="_blank" >RIV/61388955:_____/22:00559887 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/26763842:_____/22:N0000004

Výsledek na webu

<a href="https://hdl.handle.net/11104/0333014" target="_blank" >https://hdl.handle.net/11104/0333014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.eti.2022.102820" target="_blank" >10.1016/j.eti.2022.102820</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photocatalytic NOx abatement: The effect of high air flow velocity

Popis výsledku v původním jazyce

In the literature, the abatement of nitrogen oxide (NO) emissions by photocatalysis is rarely carried out at real-world air flow velocities. Here, we investigated the performance of two commercial photocatalysts, Aeroxide® TiO 2 P25 (Evonik Industries, Germany) and FN NANO®2 (Advanced Materials-JTJ, Czech Republic), P25 containing 88 % anatase and 12 % rutile, while FN 2 moreover 13 % of a binder. The degradation of NOx pollutants (0.1 and 1.0 ppmv) at air flow velocities ranging from 0.02 to 0.7 m s was tested, the photocatalytic efficiency being determined for various slit heights (5–25 mm) and rate of volume flow (1500–11 000 cm 3 min). The photocatalysts achieved substantial NO and NO abatement. Pollutant conversion decreased as the air flow velocity increased, with the highest conversion (80%) occurring at 0.1 m s. The NO conversions were slightly higher for NO than for NO2, and significantly higher for the NO concentration of 0.1 ppmv. Slit height had a negligible effect, indicating a substantial degree of mixing in the direction perpendicular to the flow. Consequently, the flow cannot be laminar in nature as the ISO standard (22197-1:2016) states. This finding is supported by the nanoindentation technique showing that the surface roughness contributed to the formation of vortexes and enhancement of the mass transport. To our best knowledge, this is the first study to test commercial photocatalysts under such a wide range of air velocities and, in doing so, it has identified considerable implications for outdoor air purification.

Název v anglickém jazyce

Photocatalytic NOx abatement: The effect of high air flow velocity

Popis výsledku anglicky

In the literature, the abatement of nitrogen oxide (NO) emissions by photocatalysis is rarely carried out at real-world air flow velocities. Here, we investigated the performance of two commercial photocatalysts, Aeroxide® TiO 2 P25 (Evonik Industries, Germany) and FN NANO®2 (Advanced Materials-JTJ, Czech Republic), P25 containing 88 % anatase and 12 % rutile, while FN 2 moreover 13 % of a binder. The degradation of NOx pollutants (0.1 and 1.0 ppmv) at air flow velocities ranging from 0.02 to 0.7 m s was tested, the photocatalytic efficiency being determined for various slit heights (5–25 mm) and rate of volume flow (1500–11 000 cm 3 min). The photocatalysts achieved substantial NO and NO abatement. Pollutant conversion decreased as the air flow velocity increased, with the highest conversion (80%) occurring at 0.1 m s. The NO conversions were slightly higher for NO than for NO2, and significantly higher for the NO concentration of 0.1 ppmv. Slit height had a negligible effect, indicating a substantial degree of mixing in the direction perpendicular to the flow. Consequently, the flow cannot be laminar in nature as the ISO standard (22197-1:2016) states. This finding is supported by the nanoindentation technique showing that the surface roughness contributed to the formation of vortexes and enhancement of the mass transport. To our best knowledge, this is the first study to test commercial photocatalysts under such a wide range of air velocities and, in doing so, it has identified considerable implications for outdoor air purification.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Environmental Technology & Innovation

ISSN

2352-1864

e-ISSN

2352-1864

Svazek periodika

28

Číslo periodika v rámci svazku

NOV 2022

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

102820

Kód UT WoS článku

000891311900016

EID výsledku v databázi Scopus

2-s2.0-85135537327