Study of TiO2 Deactivation during Gaseous Acetone Photocatalytic Oxidation

Vorontsov, Alexander V.; Kurkin, E. N.; Savinov, E. N.

doi:10.1006/jcat.1999.2572

Cited by 68 publications

(32 citation statements)

References 12 publications

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“…At its highest point, the conversion rate is associated with a decrease in the surface concentration of acetone due to its weak adsorption on the surface of the photocatalyst [16]. Photocatalyst deactivation at high temperatures (140°C) has been described in the literature [17,18], but did not occur in our study. Also, no change in the color of the photocatalysts was observed across the temperature range.…”

Section: Catalytic Activitycontrasting

confidence: 57%

Gas phase degradation of acetone using a TiO2 photocatalyst supported on a polyester fabric

Žabová

Dvořák

2009

React Kinet Catal Lett

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Section: Catalytic Activitycontrasting

confidence: 57%

Gas phase degradation of acetone using a TiO2 photocatalyst supported on a polyester fabric

Žabová

Dvořák

2009

React Kinet Catal Lett

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“…Vorontsov et al [9] reported that the rate increased linearly with inlet concentration of acetone at low inlet concentration, and became constant over a certain inlet concentration, which would obey the typical L-H equation. In order to observe the effect of acetone inlet concentration, the rate was evaluated under the operation conditions of 2 to 30 L min -1 total volumetric flow rate, no moisture, and 5.750×10 -4 to 3.029×10 -2 mol m -3 as inlet concentrations (Fig.…”

Section: Is the Inlet Concentration Of A Reactant A;mentioning

confidence: 95%

Kinetic study on degradation of gaseous acetone over thin-film TiO2 photocatalyst in a continuous flow system

Kim

et al. 2007

React Kinet Catal Lett

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“…Mendez-Roman et al 4 made similar observations. Vorontsov et al 5 reported deactivation during oxidation of acetone at elevated temperatures. This was attributed to thermal oxidation of intermediates produced by the PCO.…”

Section: Introductionmentioning

confidence: 99%

Deactivation of Titanium Dioxide Photocatalyst by Oxidation of Polydimethylsiloxane and Silicon Sealant Off-Gas in a Recirculating Batch Reactor

Chemweno

Cernohlavek

Jacoby

2008

Journal of the Air & Waste Management Association

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We have studied deactivation of titanium dioxide (TiO 2 ) photocatalyst by oxidation of polydimethylsiloxane and silicone sealant off-gas in a recirculating batch reactor. Polydimethylsiloxane vapor is a model indoor air pollutant. It does not adsorb strongly on TiO 2 in the dark, but undergoes oxidation when the ultraviolet (UV) photons are also present. Commercial silicone (room-temperature vulcanizing) sealant off-gas is an actual indoor air pollutant subject to short-term spikes in concentration. It does adsorb on the TiO 2 surface in the dark, but UV photons also catalyze its oxidation. The oxidation of the Sicontaining vapors was monitored using a Fourier transform infrared spectroscope equipped with a gas cell. Subsequent to each incremental exposure, a hexane oxidation reaction was performed to track the titania catalyst's activity. The exposures were repeated until substantial deactivation was achieved. We have also documented the regenerative effect of washing the catalyst surface with water. Surface science techniques were used to view the topography of the catalyst and to identify the elements causing the deactivation. Procedural observations of interest in the context of our recirculating batch reactor include the following: the rate of oxidation of hexane was used to assess the activity of a photocatalyst sample; hexane is an appropriate choice of a probe molecule because it does not adsorb in the dark and it undergoes photocatalytic oxidation (PCO) completely, forming CO 2 ; and hexane does not deactivate the photocatalyst surface.

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Study of TiO2 Deactivation during Gaseous Acetone Photocatalytic Oxidation

Cited by 68 publications

References 12 publications

Gas phase degradation of acetone using a TiO2 photocatalyst supported on a polyester fabric

Gas phase degradation of acetone using a TiO2 photocatalyst supported on a polyester fabric

Kinetic study on degradation of gaseous acetone over thin-film TiO2 photocatalyst in a continuous flow system

Deactivation of Titanium Dioxide Photocatalyst by Oxidation of Polydimethylsiloxane and Silicon Sealant Off-Gas in a Recirculating Batch Reactor

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