Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements

Selin ERNAM, (Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Ankara, Türkiye)
Zeynep Ece AKGÜL, (Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Ankara, Türkiye)
Deniz ÜNER (Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Ankara, Türkiye)
Turkish Journal of Chemistry
4 0
Yıl: 2023 Cilt: 47 Sayı: 5 Sayfa Aralığı: 1285 - 1295 Metin Dili: İngilizce DOI: 10.55730/1300-0527.3612 İndeks Tarihi: 21-11-2023

Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements

Öz:
The photocatalytic nitric oxide (NO) oxidation reaction is used as a standard diagnostic tool for photocatalytic activity ac- cording to the well-defined protocol described by ISO Standard 22197-1-2007. This protocol identifies the negative peak showing a $NO_x$ concentration drop during a gas flow switch from the calibration bypass to the reactor as adsorption of $NO_x$ on the surface. Evidence is provided for this first transient to be due to a dilution effect in the gas phase within the reactor. With proper models of residence time distribution analysis, this transient revealed the internal hydrodynamics and it can be used to determine the internal volumes of the system. The second transient occurs immediately after the light is switched on. The conversions strongly depend on the time constant of this transient. Controlled measurements of the effect of illumination intensity revealed that at higher light intensities the transient takes longer to reach steady state. The longer transient was attributed to the time needed to reach a thermal steady state of the hot spots gener- ated by the recombination of excess charge carriers. When the catalyst amount was investigated as a parameter, a saturation effect was observed. This saturation effect was correlated with the gas phase concentrations of $NO_x$ and moisture and their ratios to the available specific surface area. Hence, additional constraints with respect to the illumination intensity and catalyst amounts are recommended for accurate measurements of photocatalytic activity by NO oxidation.
Anahtar Kelime: Photocatalysis nitric oxide oxidation photocatalytic activity

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA S, Akgül Z, Uner D (2023). Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. , 1285 - 1295. 10.55730/1300-0527.3612
Chicago Selin Ernam,Akgül Zeynep Ece,Uner Deniz Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. (2023): 1285 - 1295. 10.55730/1300-0527.3612
MLA Selin Ernam,Akgül Zeynep Ece,Uner Deniz Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. , 2023, ss.1285 - 1295. 10.55730/1300-0527.3612
AMA S,Akgül Z,Uner D Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. . 2023; 1285 - 1295. 10.55730/1300-0527.3612
Vancouver S,Akgül Z,Uner D Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. . 2023; 1285 - 1295. 10.55730/1300-0527.3612
IEEE S,Akgül Z,Uner D "Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements." , ss.1285 - 1295, 2023. 10.55730/1300-0527.3612
ISNAD , Selin Ernam vd. "Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements". (2023), 1285-1295. https://doi.org/10.55730/1300-0527.3612
APA S, Akgül Z, Uner D (2023). Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. Turkish Journal of Chemistry, 47(5), 1285 - 1295. 10.55730/1300-0527.3612
Chicago Selin Ernam,Akgül Zeynep Ece,Uner Deniz Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. Turkish Journal of Chemistry 47, no.5 (2023): 1285 - 1295. 10.55730/1300-0527.3612
MLA Selin Ernam,Akgül Zeynep Ece,Uner Deniz Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. Turkish Journal of Chemistry, vol.47, no.5, 2023, ss.1285 - 1295. 10.55730/1300-0527.3612
AMA S,Akgül Z,Uner D Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. Turkish Journal of Chemistry. 2023; 47(5): 1285 - 1295. 10.55730/1300-0527.3612
Vancouver S,Akgül Z,Uner D Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements. Turkish Journal of Chemistry. 2023; 47(5): 1285 - 1295. 10.55730/1300-0527.3612
IEEE S,Akgül Z,Uner D "Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements." Turkish Journal of Chemistry, 47, ss.1285 - 1295, 2023. 10.55730/1300-0527.3612
ISNAD , Selin Ernam vd. "Recommendations for improving the experimental protocol for the determination of photocatalytic activity by nitric oxide oxidation measurements". Turkish Journal of Chemistry 47/5 (2023), 1285-1295. https://doi.org/10.55730/1300-0527.3612
Sayfa Oluşturulma Tarihi
24-04-2024 9:47

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