Particle size effect on catalytic activity of carbon-supported Pt nanoparticles for complete ethylene oxidation

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

doi:10.1016/j.apcata.2013.05.027

Cited by 111 publications

(79 citation statements)

References 47 publications

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“…It is important to emphasize that among all the supports, alumina has the largest specific surface area and the highest Pt dispersion, while the perovskites possess quite low specific surface area and NPs dispersion, with the smallest values corresponding to Pt/SCF-1. Despite the lowest Pt dispersion, Pt/ SCF-1 is the most active support for ethylene oxidation, which is a structure sensitive reaction and strongly depends on catalyst size and dispersion [54,55]. This means that properties of the support, other than its surface area and ability to disperse and stabilize NPs, are key for this reaction.…”

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

confidence: 98%

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

confidence: 98%

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

et al. 2015

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Section: Xrd Characterizationmentioning

confidence: 99%

“…According to the experimental observations reported by Li et al, a low calcination temperature tends to reduce the sintering of the metal particles, which is potentially beneficial for producing a large number of active sites [43]. The number of active sites was associated with the active surface area of the catalyst and thus the catalytic activity [44,45] of mixed metal oxides could be attributed to the preparation method used in this study, which is basically for the synthesis of binary metal catalysts but not mixed metal oxides. The observed small and broad diffraction peaks might be due to the effect of calcination temperature adopted in this study (250 °C) [26,43].…”

Section: Xrd Characterizationmentioning

confidence: 99%

A Comparative Study of Mn/Co Binary Metal Catalysts Supported on Two Commercial Diatomaceous Earths for Oxidation of Benzene

Tomatis

Wei

et al. 2018

Catalysts

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Two commercial diatomaceous earths were used as supports for the preparation of Mn/Co binary metal catalysts at different metal loads (5 to 10 wt % Mn and 5 to 15 wt % Co) by incipient wetness deposition. The activity of the prepared catalysts towards the complete oxidation of benzene to CO 2 and water was investigated between 100 and 400 • C. Raw supports and synthesized catalysts were characterized by XRD, N 2 physisorption, SEM-EDS, H 2 -TPR, and TPD. The purification treatment of food-grade diatomite significantly affected the crystallinity of this support while reducing its specific surface area (SSA). A loss of SSA, associated with the increase in the metal load, was observed on samples prepared on natural diatomite, while the opposite trend occurred with food-grade diatomite-supported catalysts. Metal nanoparticles of around 50 nm diameter were observed on the catalysts' surface by SEM analysis. EDS analysis confirmed the uniform deposition of the active phases on the support's surface. A larger H 2 consumption was found by TPR analysis of natural diatomite-based samples in comparison to those prepared at the same metal load on food-grade diatomite. During the catalytic oxidation experiment, over 90% conversion of benzene were achieved at a reaction temperature of 225 • C by all of the prepared samples. In addition, the formation of coke during the oxidation tests was demonstrated by TGA analysis and the soluble fraction of the produced coke was characterized by GC-MS.

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“…We find that the ternary nanohybrids always show higher activity than Pd/GO. Particle size is often a key factor affecting the activity of the catalysts because smaller particles present larger surface area and more active sites [33][34][35][36][37]. The smaller size of Pd nanoparticles in the ternary hybrids as shown in Table 1, contributes to higher catalytic activity.…”

Section: Catalytic Activities For 4-nitrophenol Reductionmentioning

confidence: 99%

二氧化铀-钯-石墨烯纳米复合材料的合成及其催化4-硝基苯酚还原反应的研究

Ding

Zhang

2017

Sci. China Mater.

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Urania-palladium-graphene nanohybrids were synthesized via a solvothermal process in ethylene glycol. With the solvothermal treatment, the Pd nanocrystals surrounded by well-crystallized urania supported on graphene oxide was obtained. This ternary hybrid showed considerably higher catalytic activity than palladium-graphene hybrids toward the reduction of 4-nitrophenol by NaBH4. Besides the smaller sizes of palladium nanoparticles in the ternary hybrids, in which the aggregation of Pd nanoparticles was prevented by urania, the charge transfer between the nano-structured Pd and urania may also contribute to the enhancement of catalytic activity by offering more active sites for adsorption and reaction.

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Particle size effect on catalytic activity of carbon-supported Pt nanoparticles for complete ethylene oxidation

Cited by 111 publications

References 47 publications

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

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

A Comparative Study of Mn/Co Binary Metal Catalysts Supported on Two Commercial Diatomaceous Earths for Oxidation of Benzene

二氧化铀-钯-石墨烯纳米复合材料的合成及其催化4-硝基苯酚还原反应的研究

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