Deep Oxidation of Benzene on Pt/V2O5–TiO2 Catalysts

Garetto, Teresita Francisca; Avila, Maria Sol; Vignatti, Charito Ivana; Rao, V. Venkat; Chary, Komandur V. R.; Apesteguı́a, C.R.

doi:10.1007/s10562-009-9924-z

Cited by 14 publications

(10 citation statements)

References 16 publications

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“…Additional experiments have to be done to evaluate quantitatively the Pt dispersion in order to validate this assumption. According to Garetto et al [18], the sample YSZ-60 nm exhibits similar catalytic performances as Pt-supported on alumina containing 0.33 wt% Pt (table 1). The apparent activation energy (Ea) was obtained via an Arrhenius-type analysis, by plotting ln r values as a function of 1/T.…”

Section: Propane Combustion On Pt/yszmentioning

confidence: 78%

Electrochemical catalysts for hydrocarbon combustion

Billard¹,

Vernoux

2007

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International audienceTwo series of electrochemical catalysts were prepared from sputtered Pt thin films onto two kinds of electrolyte membranes, 8 mol% Y2O3-stabilized ZrO2 (YSZ), an O2− conducting oxide and Na3Zr2Si2PO12 (NASICON), a Na+ one; respectively. The thickness of the Pt films varied from 8 to 120 nm. Therefore, the Pt loading was extremely low. The catalytic activity of Pt/YSZ and Pt/NASICON systems has been investigated between 200 and 500 °C for propane and propene, respectively. In spite of the low Pt loading, the Pt/YSZ electrochemical catalysts exhibited high activity for propane combustion. Furthermore, the catalytic activity can be in-situ controlled by applying electrical polarisation with high Faradaic efficiency (103). The catalytic rate of propene deep oxidation on Pt/NASICON electrochemical catalyst was found to be limited by the number of active sites, which is low on very thin Pt films. Moreover, initial anodic polarisation indicate that Na+ ions are already present on the top surface of Pt, probably proceeding from the preliminary stabilisation treatment of Pt in the reactive mixture. Nevertheless, polarisation allows the tuning of the catalytic activity of the electrochemical catalysts for propene oxidation. Finally, for both kinds of electrochemical catalysts, our results have evidenced that the measurement of the open-circuit voltage during catalytic process can be an indicator of the hydrocarbon conversion

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Section: Propane Combustion On Pt/yszmentioning

confidence: 78%

Electrochemical catalysts for hydrocarbon combustion

Billard¹,

Vernoux

2007

Top Catal

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“…In particular, Garcia et al [9] proposed that the increased activity for propane combustion on Pd/ V 2 O 5 -Al 2 O 3 catalysts is related to the modified redox properties of the catalysts. Recently, we studied the benzene combustion on Pt/V 2 O 5 -TiO 2 catalysts [10]. We found that the Pt dispersion on Pt/V 2 O 5 -TiO 2 increases with the V 2 O 5 content but the benzene combustion turnover rate follows an opposite trend.…”

Section: Introductionmentioning

confidence: 97%

“…Platinum and palladium supported on alumina carriers are widely employed for the combustion of non-halogenated hydrocarbons [1][2][3]. However, stable lower alkanes such as propane require relatively high temperatures to be completely oxidized over conventional Pt(Pd)/Al 2 O 3 and increasing research work has been lately undertaken to find suitable supports or promoters for improving the intrinsic metal oxidation activity.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the vanadium loading on the activity of Pt/V 2 O 5 -TiO 2 catalysts for benzene combustion observed in [10] is not straightforward extrapolated to propane combustion because this latter reaction is not a structure sensitive reaction on platinum [12,13]. In this paper, we study the combustion of propane over Pt/V 2 O 5 -Al 2 O 3 catalysts with the aim of establishing the effect of V 2 O 5 loading on Pt oxidation activity.…”

Section: Introductionmentioning

confidence: 99%

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Effect of V2O5 Loading on Propane Combustion over Pt/V2O5–Al2O3 Catalysts

et al. 2009

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Propane combustion was studied on Pt(0.4%)/ V 2 O 5 -Al 2 O 3 catalysts containing up to 20% V 2 O 5 . The density, strength and nature of surface acid sites were determined by TPD of NH 3 and FTIR spectra of adsorbed pyridine. The sample acidity increased with the vanadium content, essentially because the addition of vanadium oxide generated Brønsted acid sites. The Pt dispersion as determined by H 2 chemisorption increased with increasing V 2 O 5 loading. The sample activity for propane combustion was evaluated through both conversion versus temperature (light-off curves) and kinetically-controlled conversion versus time catalytic tests. The propane combustion turnover rate on Pt/V 2 O 5 -Al 2 O 3 increased with the amount of vanadium, probably because the intrinsic Pt oxidation activity increases with the sample acidity.

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“…This is so even for the most active catalysts like supported Pd and/or Pt. 8,9 In terms of elementary steps, the low activity is related to the difficulty associated with the dissociative adsorption of methane on catalyst surfaces. 10 The sticking probability of methane on noble metals is low, 11 and in addition, methane dissociation is strongly dependent on the surface coverage of reaction intermediates.…”

Section: Introductionmentioning

confidence: 99%

In Situ Spectroscopic Investigation of Low-Temperature Oxidation of Methane over Alumina-Supported Platinum during Periodic Operation

et al. 2010

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Methane oxidation over Pt/Al 2 O 3 at transient inlet-gas conditions was studied in situ using synchronous EDXAS, FTIRS and mass spectrometry. The employed combination of experimental techniques allows for simultaneous analysis of, respectively, the electronic state of platinum, surface coverage of reaction intermediates/products and catalytic activity/selectivity.By cycling of the feed gas composition between net-oxidizing and net-reducing conditions the activity for methane oxidation can be increased as compared to continuous net-oxidising conditions. Using the white-line area of time-resolved XANES spectra, a quantitative estimation of the surface O/Pt ratio indicates the formation of an inhomogeneous surface oxide on the platinum crystallites during reaction. The obtained temporary high activity can be explained ⇤ To whom correspondence should be addressed 1 through Langmuir-Hinshelwood kinetics and may result either from the formation of a partially oxidized platinum surface that is more effective for methane dissociation or, more likely, from a period with more reactive chemisorbed oxygen prior to oxide formation.

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Deep Oxidation of Benzene on Pt/V2O5–TiO2 Catalysts

Cited by 14 publications

References 16 publications

Electrochemical catalysts for hydrocarbon combustion

Electrochemical catalysts for hydrocarbon combustion

Effect of V2O5 Loading on Propane Combustion over Pt/V2O5–Al2O3 Catalysts

In Situ Spectroscopic Investigation of Low-Temperature Oxidation of Methane over Alumina-Supported Platinum during Periodic Operation

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