The effect of catalyst film thickness on the electrochemical promotion of ethylene oxidation on Pt

Koutsodontis, C.; Katsaounis, Alexandros; Figueroa, Juan Carlos Sánchez; Cavalca, C.; Pereira, Candido; Vayenas, C.G.

doi:10.1007/s11244-006-0042-5

Cited by 20 publications

(11 citation statements)

References 22 publications

(31 reference statements)

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“…This phenomenon has been applied to numerous catalytic systems, 2 including treatment of automotive exhaust and oxidation of volatile organic compounds (VOCs). [5][6][7][8] Yttria-stabilized zirconia (YSZ) is one of the most studied solid electrolytes in EPOC catalytic systems and is known to be an O 2− conductor due to the presence of oxygen vacancies inside its crystallographic structure. Recently, it was found that EPOC effect, e.g.…”

mentioning

confidence: 99%

Metal-Support Interaction of Pt Nanoparticles with Ionically and Non-Ionically Conductive Supports for CO Oxidation

Isaifan

Dole

Obeid

et al. 2012

Electrochem. Solid-State Lett.

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AIR+HDO:ESO:LLI:PVEPlatinum nanoparticles of narrow size distribution (similar to 2.5 nm) were synthesized using a modified polyol method and deposited on yttria-stabilized zirconia (Pt/YSZ), carbon (Pt/C) and gamma-alumina (Pt/gamma-Al2O3) supports, resulting in 1 wt % of Pt loading. Pt/YSZ has the highest catalytic activity toward CO oxidation among the studied catalysts. Decrease in the average particle size of Pt/YSZ led to the increase in CO conversion at low temperatures. Enhanced performances can be explained by the thermally induced O2- backspillover from YSZ over Pt nanoparticles in agreement with the electrochemical promotion mechanism. Observed effect becomes more pronounced with decreasing the particle size. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.024203esl] All rights reserved

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mentioning

confidence: 99%

Metal-Support Interaction of Pt Nanoparticles with Ionically and Non-Ionically Conductive Supports for CO Oxidation

Isaifan

Dole

Obeid

et al. 2012

Electrochem. Solid-State Lett.

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“…Λ values up to 3x10 5 and ρ values up to 150 (Vayenas et al, 2001) have been found for several systems. More recently ρ values between 300 (Koutsodontis et al, 2006a;2006b) and 1350 (Bebelis and Kotsionopoulos, 2006) have been measured for C 2 H 4 oxidation on Pt. In the experiment of Figure 2, Λ = 74,000 and ρ = 26, i.e.…”

Section: Electrochemical Promotion Of Catalysismentioning

confidence: 99%

Electrochemical promotion of catalysis (EPOC): Perspectives for application to gas emissions treatment

2013

Global NEST Journal

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Heterogeneous Catalysis and Electrocatalysis can be used very effectively on air pollution control. Air emissions coming either from mobile sources or from stationary sources, including volatile organic emissions, nitrogen oxides, hydrocarbons and carbon monoxide could be well converted to harmless non-pollutants at reasonable temperatures with cost-effective systems utilizing heterogeneous catalysis and suitable catalysts. Some of the disadvantages of conventional heterogeneous catalysts are the high production cost (since most of them are metal supported catalysts), the short life time (due to the catalyst deactivation) and the weakness to control their activity during the catalytic process. A new phenomenon of Solid State Electrochemistry called Electrochemical Promotion of Catalysis (EPOC) combined with classical heterogeneous catalysis could be applied in order to overcome some of the above problems. In this paper we are trying to show with characteristic examples how EPOC could be useful in environmentally important reactions (oxidations, reductions, etc). The results show that EPOC reveals great perspectives in environmental issues and especially in gas emissions treatment technology. The utilization of EPOC could be really useful since we can increase the catalytic activity, alter the selectivity to the desirable products and simultaneous control the reaction rate during a given electrocatalytic process.

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“…Besides the results which have been already reported in the literature till 2001 and reviewed by Professor Vayenas et al in the ''Electrochemical Promotion of Catalysis'' book [28] several new studies have been reported till the end of 2008 using various techniques and methods such as TPD [29,30,32,47,72], TPR [29], CV [21], FTIR [21], SEM-EDX [21], AC impedance spectroscopy [39], STM [73,74], work function measurements and theoretical considerations [18,75,76], transients experiments and kinetic studies [34,35], quantum mechanical calculations and Monte Carlo simulations [77] and general thermodynamic considerations [18,78,79]. The use of oxygen temperature programmed desorption both under UHV and atmospheric pressure conditions has proven [29,30] the existence of two different and distinct oxygen adsorption states on the catalyst surface when oxygen ion conductors used like YSZ.…”

Section: Electrochemical Promotion Of Reactions With Environmental Anmentioning

confidence: 99%

“…A correlation between the behaviour of adsorbed oxygen species and the change in the selectivity of oxidative coupling of methane in SOFC reactor is also observed [91] be observed. Experimental validation for the above model came 5 years later by Koutsodontis et al [34,35] using several Pt/YSZ electrocatalysts with various Pt loadings, catalyst thickness and different methods of preparation. In these two studies the effect of catalyst film thickness on the magnitude of the effect of electrochemical promotion was investigated for the model catalytic reaction of C 2 H 4 oxidation.…”

Section: Electrochemical Promotion Of Reactions With Environmental Anmentioning

confidence: 99%

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Recent developments and trends in the electrochemical promotion of catalysis (EPOC)

Katsaounis

2009

J Appl Electrochem

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Electrochemical Promotion of Catalysis (EPOC or NEMCA effect) is one of the most exciting discoveries in Electrochemistry with great impact on many catalytic and electrocatalytic processes. According to the words of John O'M. Bockris, EPOC is a triumph, and the latest in a series of advances in electrochemistry which have come about in the last 30 years. It has been shown with more than 80 different catalytic systems that the catalytic activity and selectivity of conductive catalysts deposited on solid electrolytes can be altered in a very pronounced, reversible and, to some extent, predictable manner by applying electrical currents or potentials (typically up to ±2 V) between the catalyst and a second electronic conductor (counter electrode) also deposited on the solid electrolyte. The induced steady-state change in catalytic rate can be up to 135 9 10 3 % higher than the normal (open-circuit) catalytic rate and up to 3 9 10 5 higher than the steady-state rate of ion supply. EPOC studies in the last 7 years mainly focus on the following four areas: Catalytic reactions with environmental impact (such as reduction of NO x and oxidation of light hydrocarbons), mechanistic studies on the origin of EPOC (using mainly oxygen ion conductors), scale-up pf EPOC reactors for potential commercialization via development of novel compact monolithic reactors and application of EPOC in high or low temperature fuel cells via introduction of the concept of triode fuel cell. The most recent EPOC studies in these areas are discussed in the present review and some of the future trends and aims of EPOC research are presented.

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The effect of catalyst film thickness on the electrochemical promotion of ethylene oxidation on Pt

Cited by 20 publications

References 22 publications

Metal-Support Interaction of Pt Nanoparticles with Ionically and Non-Ionically Conductive Supports for CO Oxidation

Metal-Support Interaction of Pt Nanoparticles with Ionically and Non-Ionically Conductive Supports for CO Oxidation

Electrochemical promotion of catalysis (EPOC): Perspectives for application to gas emissions treatment

Recent developments and trends in the electrochemical promotion of catalysis (EPOC)

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