Catalytic and electrocatalytic production of H2 from propane decomposition over Pt and Pd in a proton-conducting membrane-reactor

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

doi:10.1016/j.cattod.2005.03.070

Cited by 25 publications

(17 citation statements)

References 31 publications

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“…Several reactions, catalyst and supports have been studied and some recent examples can be found in [1][2][3][4][5][6]. It appears that the backspillover of the promoting species onto the catalyst surface creates a double layer that changes the chemisorptive bond strength of the reactants on the catalyst, thereby modifying the catalytic reaction rate.…”

Section: Introductionmentioning

confidence: 99%

Comparative studies between classic and wireless electrochemical promotion of a Pt catalyst for ethylene oxidation

Poulidi

Metcalfe

2008

J Appl Electrochem

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A comparative study between a classic and a wireless electrochemical promotion experiment was undertaken as a tool towards the better understanding of both systems. The catalytic modification of a platinum catalyst for ethylene oxidation was studied. The catalyst was supported on yttria-stabilised-zirconia (YSZ), a known pure oxide ion conductor, for the classic experiment and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d -a mixed oxide ion electronic conductor-was used for the wireless experiment. The two systems showed certain similarities in terms of the reaction classification (in both cases electrophobic behaviour was observed) and the promotion mechanism. Significant difference was observed in the time scales and the reversibility of the induced rate modification.

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Section: Introductionmentioning

confidence: 99%

Comparative studies between classic and wireless electrochemical promotion of a Pt catalyst for ethylene oxidation

Poulidi

Metcalfe

2008

J Appl Electrochem

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“…The variety of H ? conductors investigated is shown in Table 1, in the studies reported by Thursfield et al [39], Karagiannakis et al [65,69] and Kokkofitis et al [59,70,71].…”

Section: Electrochemical Promotion Of Reactions With Environmental Anmentioning

confidence: 97%

“…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%

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 observed reaction rates are about one order of magnitude higher than under normal catalytic conditions, when hydrogen is supplied electrochemically. Recently proposed application of a high -temperature proton -conducting membrane is the dehydrogenation of propane over Pt and Pd to produce propylene and hydrogen (Karagiannakis, Kokkofi tis, and Zisekas, 2005 ).…”

Section: Electrocatalytic Membrane Reactorsmentioning

confidence: 99%

Solid Electrolyte Membrane Reactors

et al. 2010

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IntroductionThe present chapter introduces a specifi c type of membrane reactor only briefl y mentioned in Chapter 1 . The solid electrolyte membrane reactor s ( SEMR ) -or electrochemical membrane reactors as they also are called -are equipped with ion -conducting membranes, which ideally are impermeable for non -charged reaction species. These reactors operate as electrochemical cells, in which the oxidation and reduction reactions are carried out separately on catalyst/electrodes layers located on the opposite sides of the electrolyte. The development of solid electrolyte membrane reactors has reached a semi -commercial stage in fuel cells, in which the maximal generation of electric energy by the total oxidation of hydrogen or hydrocarbon feeds is the primary goal of operation. Research on chemical reactor applications is strongly concentrated in the high -temperature range using either oxygen ion -or proton -conducting inorganic membranes. Some interesting examples were published recently, investigating proton -conducting polymeric membranes for the production of chemicals.This chapter gives a brief overview on the current status and future trends in the development and application of solid electrolyte reactors equipped with solid electrolyte ( SE ) materials used as membranes in these reactors. Initially the working principle of a solid electrolyte membrane reactor and material aspects are discussed. The second part of the chapter gives a detailed description of the special aspects concerning the modeling of solid electrolyte membrane reactors, as well as the application examples of maleic anhydride ( MA ) synthesis and oxidative dehydrogenation of ethane. Finally the chapter reviews recent papers concerning solid electrolyte membrane reactors applying:• high -temperature oxygen ion conductors, • high -temperature proton conductors, • low -temperature proton conductors.There are some recent review papers, especially written for high -temperature applications, which we would like to recommend to readers interested in more

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Catalytic and electrocatalytic production of H2 from propane decomposition over Pt and Pd in a proton-conducting membrane-reactor

Cited by 25 publications

References 31 publications

Comparative studies between classic and wireless electrochemical promotion of a Pt catalyst for ethylene oxidation

Comparative studies between classic and wireless electrochemical promotion of a Pt catalyst for ethylene oxidation

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

Solid Electrolyte Membrane Reactors

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