Application of TiO2 photocatalysis for air treatment: Patents’ overview

Paz, Yaron

doi:10.1016/j.apcatb.2010.05.011

Cited by 357 publications

(190 citation statements)

References 12 publications

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“…Considered as a passive measure for the removal of air pollutants they have been commercially available for some years. Basic principles and first experiences with their practical application have been reviewed in contributions to journals [9][10][11][12][13][14][15][16] and are summarized in compendia. 17,18 A very important group of air pollutants are the nitrogen oxides (mainly nitrogen(II) oxide, NO, and nitrogen(IV) oxide, NO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert

Engel

Große

et al. 2013

Phys. Chem. Chem. Phys.

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Air pollution by nitrogen oxides represents a serious environmental problem in urban areas where numerous sources of these pollutants are concentrated. One approach to reduce the concentration of these air pollutants is their light-induced oxidation in the presence of molecular oxygen and a photocatalytically active building material which uses titanium dioxide as the photocatalyst. Herein, results of an investigation concerning the influence of the photon flux and the pollutant concentration on the rate of the photocatalytic oxidation of nitrogen(II) oxide in the presence of molecular oxygen and UV(A) irradiated titanium dioxide powder are presented. A Langmuir-Hinshelwood-type rate law for the photocatalytic NO oxidation inside the photoreactor comprising four kinetic parameters is derived being suitable to describe the influence of the pollutant concentration and the photon flux on the rate of the photocatalytic oxidation of nitrogen(II) oxide.

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Section: Introductionmentioning

confidence: 99%

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert

Engel

Große

et al. 2013

Phys. Chem. Chem. Phys.

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“…Both EPA and EEA established the hourly NOx air concentration limit at 0.1 ppm and 0.2 ppm, respectively. Even though processes such as selective catalytic and non-catalytic reduction of NOx were implemented to reduce the end of pipe emissions [3,4], photocatalysis with titanium dioxide (TiO2) is now being seen as a very promising approach to decompose these pollutants [5][6][7]. In fact, solar photoabatement of pollutants uses the sun as energy source and works at atmospheric conditions degrading pollutants present in low atmospheric concentrations.…”

Section: Introductionmentioning

confidence: 99%

Highly active photocatalytic paint for NOx abatement under real-outdoor conditions

Ângelo

Andrade

Mendes

2014

Applied Catalysis A: General

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In this work the photocatalytic activity of paints incorporating commercial titanium dioxide for outdoor nitrogen oxide (NO) photoabatement is assessed. The paint acts as a 3D support of the photocatalyst and thus allows a larger amount of TiO2 nanoparticles to absorb light and to contact with pollutants, when compared with a 2D photocatalytic surface. NO conversion and selectivity towards nitrites and nitrates were determined according to the standard ISO 22197-1:2007 (E).Paint coatings were formulated and tested under laboratory and outdoor conditions. The best paint formulation incorporates CristalACTiV TM PC500 photocatalyst from Cristal and calcium carbonate extender, presenting a NO conversion of ca. 70% and a selectivity of ca. 40% under laboratory conditions. The same photocatalyst but characterized in the form of an optically thick film of compressed powder presented ca. 95% and 45% of conversion and selectivity, respectively. Under the real-outdoor conditions, the best performing paint showed a NO conversion of about 95%.

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“…These electrons and holes could undergo subsequent oxidation and reduction reactions with any species, which might be adsorbed on the surface of the semiconductor to give the necessary products. Among several semiconductors, TiO2 is the most commonly employed photocatalyst due to inexpensive cost, readily availability, and chemical stability [4,5]. However, TiO2 exhibits a relatively high activity only under UV light, which exceeds the band-gap energy of 3.0 or 3.2 eV in the rutile or anatase crystalline phase, respectively, limiting its practical applications [6].…”

Section: Introductionmentioning

confidence: 99%

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

2012

Clean Technology

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주제어 : 질소 도핑, 황 도핑, 공기 유량, 아세톤 생성, 발광 다이오드Abstract : This work explored the characteristics and the photocatalytic activities of S element-doped TiO2 (S-TiO2) and N element-doped TiO2 (N-TiO2) for the decomposition of gas-phase isopropyl alcohol (IPA) at sub-ppm concentrations, using a plug-flow reactor irradiated by 8-W daylight lamp or visible light-emitting-diodes (LEDs). In addition, the generation yield of acetone during photocatalytic processes for IPA at sub-ppm levels was examined. The surface characteristics of prepared S-and N-TiO2 photocatalysts were analyzed to indicate that they could be effectively activated by visible-light irradiation. Regarding both types of photocatalysts, the cleaning efficiency of IPA increased as the air flow rate (AFR) was decreased. The average cleaning efficiency determined via the S-TiO2 system for the AFR of 2.0 L min -1 was 39%, whereas it was close to 100% for the AFR of 0.1 L min -1. Regarding the N-TiO2 system, the average cleaning efficiency for the AFR of 2.0 L min -1 was above 90%, whereas it was still close to 100% for the AFR of 0.1 L min -1 . In contrast to the cleaning efficiencies of IPA, both types of photocatalysts revealed a decreasing trend in the generation yields of acetone with decreasing the AFR. Consequently, the N-TiO2 system was preferred for cleaning of sub-ppm IPA to S-TiO2 system and should be operated under low AFR conditions to minimize the acetone generation. In addition, 8-W daylight lamp exhibited higher cleaning efficiency of IPA than for visible LEDs.

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Application of TiO2 photocatalysis for air treatment: Patents’ overview

Cited by 357 publications

References 12 publications

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Highly active photocatalytic paint for NOx abatement under real-outdoor conditions

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

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