Size-dependent activity of Pt/yttria-stabilized zirconia catalyst for ethylene and carbon monoxide oxidation in oxygen-free gas environment

Isaifan, Rima J.; Ntais, Spyridon; Couillard, Martin; Baranova, Elena A.

doi:10.1016/j.jcat.2015.01.010

Cited by 36 publications

(25 citation statements)

References 49 publications

(80 reference statements)

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“…After the plateau, Pt/CeO 2 activity declines gradually and reaches the steady‐state after 3 h, which is characterised by a reaction rate that is eight times lower than that in the presence of oxygen. The continuous decline in the reaction rate is because of the consumption of surface lattice oxygen ions from ceria and because of catalyst surface poisoning by carbon deposition as shown previously, which will be discussed for Figures and . The deposited carbon is oxidised by O 2− [Eq.…”

Section: Resultsmentioning

confidence: 72%

Ethylene Oxidation in an Oxygen‐Deficient Environment: Why Ceria is an Active Support?

Dole

Baranova

2016

ChemCatChem

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Pt/CeO2, Ru/CeO2, Ir/CeO2 and the corresponding unsupported nanoparticles (Pt, Ru and Ir) were evaluated for their performance in the complete oxidation of ethylene in the presence and absence of oxygen. The lattice oxygen and oxygen storage capacity (OSC) of CeO2 had a significant influence on the interaction with the supported metal nanoparticles, which caused different catalytic behaviours in the absence of oxygen. Overall, Ru/CeO2 was more stable than Ir/CeO2 and Pt/CeO2, which results in transient promotional rate enhancement ratio (ρMSI; MSI=metal–support interaction) values that reach 200 in the first 25 min. These results were attributed to the corresponding interaction with CeO2 and negligible carbon deposition. A proposed relationship between ρMSI and the O2− consumed from CeO2 is discussed, which was suggested as a possible tool to estimate the extent of the MSI. In general, an increase in ρMSI corresponded to an increase in O2− consumed from ceria.

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Section: Resultsmentioning

confidence: 72%

Ethylene Oxidation in an Oxygen‐Deficient Environment: Why Ceria is an Active Support?

Dole

Baranova

2016

ChemCatChem

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“…As was shown recently, under the reaction conditions of catalytic oxidation of hydrocarbons and CO, the interaction between Pt NPs and ionically conductive ceramics (YSZ and samarium doped ceria) leads to migration of lattice oxygen ions to the surface of Pt, resulting in changes of the adsorption properties of the catalyst and in reaction rate increase [56][57][58][59]. The state of the surface of Pt NPs under reaction conditions is similar to a surface state which is achieved under electrochemical promotion of thin continuous Pt catalyst-electrode films [1,59].…”

Section: Pt Nanoparticles Supported On Sm 1-x Ce X Feo 3-d Materialsmentioning

confidence: 85%

Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

et al. 2015

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The novel Sm 1-x Ce x FeO 3-d (x = 0, 0.01, 0.05) (SCF) perovskites with and without 1 wt% of Pt nanoparticles (NPs) were investigated for carbon monoxide and ethylene oxidation in the temperature range of 25-350°C. All perovskites were predominantly ionic conductors, with ionic conductivities two orders of magnitude higher than the electronic contribution. Furthermore, the cerium doping increases the ionic conductivity of these materials at high temperatures. The bare SCF perovskites possessed catalytic activity for both reactions; however the Pt-supported catalysts had 50-100°C lower light-off temperatures than the corresponding perovskites. More significantly, the enhancement in the catalytic activity of the Pt/SCF family with respect to other Pt-supported catalysts was shown by the lower activation energies, which were 25.7 kJ/mol over Pt/Sm 0.95 Ce 0.05 FeO 3-d and 18.3 kJ/mol over Pt/Sm 0.99 Ce 0.01 FeO 3-d for CO and ethylene oxidation, respectively. The corresponding activation energies for Pt NPs supported on conventional cAl 2 O 3 were 57.1 and 32 kJ/mol, and on ionically conductive yttria-stabilized zirconia (YSZ) were 35.8 and 22 kJ/mol for CO and C 2 H 4 oxidation, respectively. The increased activity was attributed to the high ionic conductivity (O 2-) of the perovskite supports at 100-400°C that facilitates the spontaneous backspillover of O 2-promoters from the lattice to the gas-exposed Pt nanoparticle surface. The promoters alter the adsorption strength of reactants similar to the electrochemical promotion mechanism observed under polarization.

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“…Two TiO2 nanocolloids were prepared by polyol method as described in details in [9][10][11]. Starting with about 2.7 g of each of two precursor salts: Titanium (IV) oxysulfate (TiOSO4, Sigma-Aldrich 99%) for coating 1 (TC-1) and titanium isopropoxide (Ti(OCH(CH3)3)4, (Sigma Aldrich, 95%) for coating 2 (TC-2) that were measured and introduced into a three-neck flask and stirred for 30 min to dissolve in tetraethyleneglycol (TEG) from (Sigma-Aldrich, ≥ 99%) at room temperature.…”

Section: Tio2 Nanocolloids Synthesismentioning

confidence: 99%

Theoretical and Experimental Characterization of Efficient Anti-Dust Coatings under Desert Conditions

Isaifan¹,

Johnson²,

Mansour³

et al. 2018

JTFR

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Transparent titania coatings have self-cleaning and anti-reflection properties (AR) that are of great importance in optical and solar applications. In this work, an efficient and easy to scale up adsorptive self-assembly process is used to coat glass substrates with two TiO2 nanocolloids (TC-1 and TC-2) prepared via polyol method. TEM images of the nanoparticles show an average particle size of 2.6 and 167.7 nm of TC-1 and TC-2, respectively. The theoretical values for the coating thickness as well as for the antireflective index were compared with the experimental values obtained via elipsometer measurements. The self-cleaning properties were investigated by optical microscopy, atomic force microscopy, contact angle, surface tension and UV-vis spectroscopy. The optical images show 56% reduction of dust deposition rate with lower adhesion force over the best performing coated surfaces TC-1 compared with bare glass substrates and TC-2 after 7 days of soiling.

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Size-dependent activity of Pt/yttria-stabilized zirconia catalyst for ethylene and carbon monoxide oxidation in oxygen-free gas environment

Cited by 36 publications

References 49 publications

Ethylene Oxidation in an Oxygen‐Deficient Environment: Why Ceria is an Active Support?

Ethylene Oxidation in an Oxygen‐Deficient Environment: Why Ceria is an Active Support?

Promotion of Pt Nanoparticles by Lattice Oxygen in SmFeO3 Perovskite Group for Carbon Monoxide and Ethylene Oxidation

Theoretical and Experimental Characterization of Efficient Anti-Dust Coatings under Desert Conditions

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