Electrochemical promotion of the NO reduction by C2H4 on Pt/YSZ and by CO on Pd/YSZ

Marwood, Michel; Kaloyannis, Anthony; Vayenas, C.G.

doi:10.1007/bf02376038

Cited by 23 publications

(16 citation statements)

References 14 publications

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“…Also no measurable concentration of NO 2 was detected. The observed high selectivity to N 2 implies that all N 2 O possibly produced by NO reduction on the Pt catalyst-electrodes is further reduced to N 2 on the Rh catalyst-electrodes [23,25,26]. The phenomenon is reversible, since current interruption causes both rates to return to their initial values after approximately 70 min (Fig.…”

Section: Resultsmentioning

confidence: 94%

“…Such a separation requires the use of more-or-less inert (e.g. Au) counter electrodes as is done in single chamber studies of the electropromotion of NO reduction [24][25][26][27][28][29][30][31][32][33][41][42][43][44][45][46][47][48][49][50][51].…”

Section: Resultsmentioning

confidence: 99%

“…These studies have utilized YSZ [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], b 00 -Al 2 O 3 [40][41][42][43][44][45][46][47][48][49], Nasicon [50], and proton conductor [51] solid electrolytes and, with very few recent exceptions [34][35][36][37][38], thick (0.5-1 lm) porous metal films. With a very recent exception utilizing Pt-Rh alloy catalysts [38], they were also limited to p O 2 values below 2% where the O 2 poisoning problem is not pronounced.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical promotion of NO reduction by C2H4 in 10% O2 using a monolithic electropromoted reactor with Rh/YSZ/Pt elements

et al. 2008

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The reduction of NO by C 2 H 4 in high excess of O 2 and temperatures 200-300°C was investigated using a monolithic electropromoted reactor (MEPR) with twentytwo Rh/YSZ/Pt parallel plate elements. It was found that at 220-240°C and 10% O 2 the selective catalytic reduction (SCR) of NO can be electropromoted by 450% with near 100% selectivity to N 2 and K NO values up to 2.4. The corresponding rate enhancement ratio of complete C 2 H 4 oxidation is up to 900% with Faradaic efficiency, K CO 2 , values up to 350. The system appears promising for practical applications.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical promotion of NO reduction by C2H4 in 10% O2 using a monolithic electropromoted reactor with Rh/YSZ/Pt elements

et al. 2008

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“…the NO reduction by ethylene in presence of excess O 2 , a reaction which is electrochemically promoted predominantly by positive current on Rh [21,22] (electrophobic behaviour) and predominantly by negative current on Pt [13,22,23] (electrophilic behaviour).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Pt has a lower propensity for NO dissociation, thus leads to lower N 2 selectivity, but is not as susceptible to oxygen poisoning as Rh is [13,[23][24][25][26][27][28][29][30][31]. In this respect Rh and Pt are complementary and it is easy to understand why positive potentials which weaken the metal-O chemisorptive bond [13,21,22], favour the reduction of NO on Rh (electrophobic behaviour) [13,21,22] while negative potentials which enhance NO dissociation favour the reduction of NO on Pt (electrophilic behaviour) [13,21,22].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Promotion of NO Reduction by C2H4 in Excess O2 Using a Monolithic Electropromoted Reactor and Pt–Rh Sputtered Electrodes

et al. 2008

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The reduction of NO by ethylene in the presence of excess oxygen was investigated in a recently developed monolithic electropromoted reactor (MEPR). In this novel dismantlable monolithic-type electrochemically promoted catalytic reactor, thin (*40 nm) porous catalyst films are sputter-deposited on thin (0.25 mm) parallel solid electrolyte plates supported in the grooves of a ceramic monolithic holder and serve as electropromoted catalyst elements. Using Pt-Rh(1:1)/YSZ/Au-type catalyst elements, the 8-plate reactor operated with apparent Faradaic efficiency exceeding unity achieving significant and reversible enhancement in the rates of C 2 H 4 and NO consumption in presence of up to 10% O 2 in the feed at gas flow rates of 1,000 cc/min. The reactor, which is a hybrid between a monolithic catalytic reactor and a flat-plate solid oxide fuel cell, permits easy practical utilization of the electrochemical promotion of catalysis.

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Rules and Mathematical Modeling of Electrochemical and Chemical Promotion

Vayenas

Brosda

Pliangos

2001

Journal of Catalysis

134

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Electrochemical promotion of the NO reduction by C2H4 on Pt/YSZ and by CO on Pd/YSZ

Cited by 23 publications

References 14 publications

Electrochemical promotion of NO reduction by C2H4 in 10% O2 using a monolithic electropromoted reactor with Rh/YSZ/Pt elements

Electrochemical promotion of NO reduction by C2H4 in 10% O2 using a monolithic electropromoted reactor with Rh/YSZ/Pt elements

Electrochemical Promotion of NO Reduction by C2H4 in Excess O2 Using a Monolithic Electropromoted Reactor and Pt–Rh Sputtered Electrodes

Rules and Mathematical Modeling of Electrochemical and Chemical Promotion

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