Catalytic study and electrochemical promotion of propane oxidation on Pt/YSZ

Kokkofitis, Christos; Karagiannakis, George; Zisekas, S.; Stoukides, Michael

doi:10.1016/j.jcat.2005.07.017

Cited by 49 publications

(65 citation statements)

References 31 publications

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“…In a previous work [19], the oxidation of propane was studied on Pt in an O 2) solid electrolyte cell. In the present work, the catalytic and electrocatalytic behavior of Pt, Pd and Ag towards propane oxidation was studied in the same solid electrolyte cell-reactor and the effect of electrochemical promotion was investigated under the same reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical promotion in O2− cells during propane oxidation

Kokkofitis¹,

Karagiannakis²,

Stoukides³

2007

Top Catal

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The catalytic oxidation of propane was studied in an oxygen ion conducting solid electrolyte cell at 623-773 K and atmospheric total pressure. Three catalyst-electrodes were tested, Pt, Pd and Ag. Under open circuit, the technique of Solid Electrolyte Potentiometry (SEP) was used to monitor the thermodynamic activity of oxygen adsorbed on the catalyst surface during reaction. Under closed circuit, the effect of electrochemical promotion was investigated. On Pt and Pd, the promoting effect was of the ''inverted volcano'' type. On Pt, the reaction exhibited a strong NEMCA effect; the closed circuit rate exceeded the open circuit rate by more than three orders of magnitude. On Pd, on the other hand, the effect was hardly Faradaic. On Ag, a moderate NEMCA behavior was observed and the promoting effect was purely electrophobic. Both open and closed circuit results obtained with these three catalyst-electrodes, are evaluated and compared to each other.

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Section: Introductionmentioning

confidence: 99%

Electrochemical promotion in O2− cells during propane oxidation

Kokkofitis¹,

Karagiannakis²,

Stoukides³

2007

Top Catal

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“…On the other hand totally different behaviour can be observed during oxidation of saturated hydrocarbons like propane. Using various types of electrocatalysts (LSM/YSZ [46], Pt/YSZ [19,37,45,47], Rh/ YSZ [36,49], Pd/YSZ [65], Ag/YSZ [50], Pt/ b 00 -Al 2 O 3 (with Na ? conductivity) [48]) it has been found that the reaction exhibits purely electrophobic or in some cases (depending on the reaction conditions) inverted volcano behaviour.…”

Section: Electrochemical Promotion Of Reactions With Environmental Anmentioning

confidence: 99%

“…K values up to 3 9 10 5 and q values up to 150 [28] have been found for several systems. More recently q values between 300 [34,35] and 1,400 [36,37] have been observed for C 2 H 4 and C 3 H 8 oxidation on Pt/YSZ, respectively. In the experiment of Fig.…”

Section: Introductionmentioning

confidence: 97%

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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“…Typically q is of the order 2-100 [1-3] but values as high as 1,200 have been recently reported [25,26].…”

Section: Mepr Operationmentioning

confidence: 99%

Tailor-structured skeletal Pt catalysts employed in a monolithic electropromoted reactor

et al. 2008

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The performance of a monolithic electropromoted reactor was investigated under high gas flow rates, for the oxidation of ethylene utilizing thin (40 nm) tailorstructured highly porous skeletal Pt catalyst-electrodes coated on Y 2 O 3 -stabilized-ZrO 2 (YSZ). Electrochemical enhancement was observed at gas flow rates as high as 25 L min -1 and mean gas residence times as low as 0.15 s. This is a promising step for the practical utilization of the electrochemical promotion of catalysis. An interesting feature of the skeletal Pt catalyst-electrodes is the appearance of a sharp rate maximum upon anodic current interruption which appears to be related to their dendritic structure and enhanced capacity for promoter storage.

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Catalytic study and electrochemical promotion of propane oxidation on Pt/YSZ

Cited by 49 publications

References 31 publications

Electrochemical promotion in O2− cells during propane oxidation

Electrochemical promotion in O2− cells during propane oxidation

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

Tailor-structured skeletal Pt catalysts employed in a monolithic electropromoted reactor

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