Photocatalytic degradation of nitric oxide on various cerium doped TiO2 thin layers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F17%3A10238178" target="_blank" >RIV/61989100:27710/17:10238178 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Photocatalytic degradation of nitric oxide on various cerium doped TiO2 thin layers

Popis výsledku v původním jazyce

The photocatalytic methods for removal of nitrogen oxides have recently become very interesting research field. Photo-deNOx processes offer attractive method for the reduction of these harmful gases. The photocatalytic degradation of nitric oxide is a promising method, especially after finding the optimal photocatalyst, which will increase the efficiency of the method and allow the photocatalytic degradation of nitric oxide under visible light irradiation. This work describes photocatalytic degradation of nitric oxide using thin layers of cerium doped TiO2. TiO2 photocatalysts with cerium content of 0.7; 1.4 and 6.3 wt. % were prepared by the sol-gel method followed by calcination at 450 °C. Photocatalysts were coated on concrete blocks. Prepared thin layers were characterized by XRD, XRF, UV-Vis spectrometry and nitrogen physisorption. The photocatalytic measurements were carried out in the flow reactor constructed according the ISO 22197-1:2007. The addition of cerium led to an increase of specific surface area and decrease of absorption edge energies. Nevertheless, the specific surface area is not the decisive parameter in photocatalysis and the experimental results showed that the sample with the highest specific surface area was the least photocatalytically active. The most photocatalytically active thin layer for the decomposition of NO was the one containing 0.7 wt. % Ce. The highest conversion of NO in presence of this thin layer reached 27 % but only small part of NO was decomposed to O2 and N2. Majority of converted NO was oxidized to NO2 and NO3- and NO2- species.

Název v anglickém jazyce

Photocatalytic degradation of nitric oxide on various cerium doped TiO2 thin layers

Popis výsledku anglicky

The photocatalytic methods for removal of nitrogen oxides have recently become very interesting research field. Photo-deNOx processes offer attractive method for the reduction of these harmful gases. The photocatalytic degradation of nitric oxide is a promising method, especially after finding the optimal photocatalyst, which will increase the efficiency of the method and allow the photocatalytic degradation of nitric oxide under visible light irradiation. This work describes photocatalytic degradation of nitric oxide using thin layers of cerium doped TiO2. TiO2 photocatalysts with cerium content of 0.7; 1.4 and 6.3 wt. % were prepared by the sol-gel method followed by calcination at 450 °C. Photocatalysts were coated on concrete blocks. Prepared thin layers were characterized by XRD, XRF, UV-Vis spectrometry and nitrogen physisorption. The photocatalytic measurements were carried out in the flow reactor constructed according the ISO 22197-1:2007. The addition of cerium led to an increase of specific surface area and decrease of absorption edge energies. Nevertheless, the specific surface area is not the decisive parameter in photocatalysis and the experimental results showed that the sample with the highest specific surface area was the least photocatalytically active. The most photocatalytically active thin layer for the decomposition of NO was the one containing 0.7 wt. % Ce. The highest conversion of NO in presence of this thin layer reached 27 % but only small part of NO was decomposed to O2 and N2. Majority of converted NO was oxidized to NO2 and NO3- and NO2- species.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

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OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/LO1208" target="_blank" >LO1208: Teoretické aspekty energetického zpracování odpadů a ochrany prostředí před negativními dopady</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Waste Forum

ISSN

1804-0195

e-ISSN

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Svazek periodika

2

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

9

Strana od-do

46-54

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-85031101129