Gas-phase photocatalytic oxidation of diethyl sulfide over TiO2: kinetic investigations and catalyst deactivation

Kozlov, Denis; Vorontsov, Alexander V.; Smirniotis, Panagiotis G.; Savinov, E. N.

doi:10.1016/s0926-3373(02)00217-5

Cited by 92 publications

(58 citation statements)

References 19 publications

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“…This is consistent with formate formation under atmospheric conditions, since it is expected that CH 3 • radicals will be re-adsorbed on the surface to form methoxy groups and subsequently converted to formate species [31]. Other reported intermediates are acetic acid and formaldehyde as well as different condensation products such as 3-hydroxybutanal and crotonaldehyde [13,38]. It is well known that crotonaldehydeforms spontaneously upon adsorption on anatase TiO 2 under standard conditions [13], as was also shown in Sec.…”

Section: Surface Reaction Kinetics On Tiosupporting

confidence: 82%

“…However, the crotonaldehyde coverage can also decrease via other reactions, for example through oxidation to formaldehyde or acetic acid [13,31,38]. Even though the latter represent minority surface reaction pathways, meaning that no major IR peaks associated with these species are observed in the experiments, they are nevertheless included in the model to account for mass balance and possible desorption.…”

mentioning

confidence: 99%

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Adsorption and photo-oxidation of acetaldehyde on TiO2 and sulfate-modified TiO2: Studies by in situ FTIR spectroscopy and micro-kinetic modeling

Topalian

Stefanov

Granqvist

et al. 2013

Journal of Catalysis

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Adsorption and photocatalytic oxidation of acetaldehyde have been investigated on TiO 2 and sulphate-modified TiO 2 films (denoted SO 4 -TiO 2 ). In situ Fourier transform infrared spectroscopy was used to study surface reactions as a function of time and number of experimental cycles. Spectral analysis and micro-kinetic modelling show that crotonaldehyde formation occurs spontaneously on TiO 2 but is impeded on SO 4 -TiO 2 , where instead acetaldehyde desorption is significant. Photo-oxidation yields significant amounts of formate on TiO 2 , and was identified as the rate-determining step and associated with site blocking.Significantly smaller amounts of formate were observed on SO 4 -TiO 2 , which is due to the acidity of this surface resulting in weaker bonding of aldehyde and carboxylate intermediate species. Our results are of considerable interest for applications to photocatalytic air purification and to surfaces with controlled wettability.

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Section: Surface Reaction Kinetics On Tiosupporting

confidence: 82%

mentioning

confidence: 99%

Adsorption and photo-oxidation of acetaldehyde on TiO2 and sulfate-modified TiO2: Studies by in situ FTIR spectroscopy and micro-kinetic modeling

Topalian

Stefanov

Granqvist

et al. 2013

Journal of Catalysis

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“…Thioanisole is a typical example of an organic sulfide that is a toxic pollutant and imparts a pungent odor to water. [20,21] In fact, the AuPDMS-2 nanocomposite foam shows a high selectivity for sulfur-containing molecules. Au nanoparticles inside the foam may offer a high surface area for binding of thioanisole molecules and should enable easy extraction of thioanisole from contaminated water.…”

mentioning

confidence: 99%

Removal of Organic Compounds from Water by Using a Gold Nanoparticle–Poly(dimethylsiloxane) Nanocomposite Foam

Gupta

Kulkarni

2011

ChemSusChem

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A low density, highly compressible, porous foam of poly(dimethylsiloxane) (PDMS) incorporated with Au nanoparticles (10-50 nm) has been synthesized by using a single-step process with water as a medium. It exhibits high swelling ability (≈600%) against benzene, toluene, ethylbenzene, and xylene (BTEX)-a property that has been exploited in the removal of oil spills from water. It is resistant to harsh chemical environments. It is also effective against odorous sulfur containing contaminants such as thioanisole. It works repeatedly and efficiently over many cycles. The regeneration of the foam is rather simple: heating in air to 300 °C for short time brings back its original activity. The fascinating properties of Au nanoparticles could be mingled with those of PDMS to provide a sustainable and practical solution for water treatment. It is also demonstrated to work effectively for deodorizing garlic extract with a promise as a food packaging material.

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“…Until now, photo-catalytic deactivation has only been discussed in a few reports. 15,16 When 10 vol % H 2 O was added during the photocatalytic decomposition of toluene, a toluene conversion of 70% was maintained for 5 days. From this result, the addition of water was assumed to play a role in the generation OH radicals during the photocatalytic reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore; in this study, attempts were made to incorporate Al or W ions below 10 mol% into mesoporous titano (15 mol %) silicate frameworks to balance the ionic charges and atomic sizes between the metals, which resulted in mesoporous titanosilicates with high structural stability. Consequently, these Al-Wmesoporous titanosilicates (Al7.5-W2.5-Ti15-Si75, Al5.0-W5.0-Ti 15 nosilicates. Figure 1 shows the general preparation method of Al or W-incorporated mesoporous titanosilicates.…”

Section: Introductionmentioning

confidence: 99%

Toluene Decompositions over Al-W-incorporated Mesoporous Titanosilicates Photocatalysts

Lee¹,

Kim²,

Jeong³

et al. 2009

Bulletin of the Korean Chemical Society

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This study investigated the decomposition activities of toluene on 10 mol% Al-W-incorporated mesoporous titano (15 mol %) silicates. The mesopore sizes observed in the transmission electron microscopy images ranged from 2.0 to 5.0 nm, and the pores were irregular on the addition of 10 mol% Al or W ions, but changed to regular hexagonal forms with the simultaneous additions of Al and W. The X-ray photon spectroscopy results showed a shift of the special peak for Ti2p in Al-incorporated mesoporous titanosilicates to a stronger binding energy compared to those of mesoporous titanosilicates and Al-incorporated mesoporous titanosilicates. Three O1s peaks in the spectra of the Al and W coexisted samples were observed at 530.5 and 531.7, 533, and 533.7eV, which were assigned to Ti-Os in TiO2 and Ti2O3, Si-O in SiO2 and Al-O in Al2O3, respectively. The toluene molecules desorbed at lower temperatures over W-incorporated mesoporous titanosilicates, and the amounts of toluene desorbed were also small; however, Al-incorporated mesoporous titanosilicates adsorbed much more toluene, particular over Al7.5-W2.5-Ti15-Si75. The photocatalytic decomposition of toluene was more enhanced over Al7.5-W2.5-Ti15-Si75 than over Al-or W-incorporated mesoporous titanosilicates only.

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Gas-phase photocatalytic oxidation of diethyl sulfide over TiO2: kinetic investigations and catalyst deactivation

Cited by 92 publications

References 19 publications

Adsorption and photo-oxidation of acetaldehyde on TiO2 and sulfate-modified TiO2: Studies by in situ FTIR spectroscopy and micro-kinetic modeling

Adsorption and photo-oxidation of acetaldehyde on TiO2 and sulfate-modified TiO2: Studies by in situ FTIR spectroscopy and micro-kinetic modeling

Removal of Organic Compounds from Water by Using a Gold Nanoparticle–Poly(dimethylsiloxane) Nanocomposite Foam

Toluene Decompositions over Al-W-incorporated Mesoporous Titanosilicates Photocatalysts

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