Low-temperature propene combustion over Pt/K-βAl2O3 electrochemical catalyst: Characterization, catalytic activity measurements, and investigation of the NEMCA effect

Lucas-Consuegra, A. de; Dorado, Fernando; Valverde, J.L.; Karoum, R.; Vernoux, P.

doi:10.1016/j.jcat.2007.06.031

Cited by 60 publications

(24 citation statements)

References 42 publications

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“…In this way, a clean, un-promoted catalyst surface, free of any promoter species, was achieved. These surface species were also observed by SEM-EDX analysis on Pt catalyst films deposited on K-βAl2O3 solid electrolyte for propene oxidation reaction [24]. In this case, the presence of potassium oxides and superoxides, along with carbon deposited fragments were observed after catalytic experiments.…”

Section: Ex Situ Characterization Of Alkali-promoted Catalyst Surfacesmentioning

confidence: 56%

“…On the other hand, the first EPOC study using a K + -conductor electrolyte (K2YZr(PO4)3) dates from 1997 and addressed the Fe-catalyzed ammonia decomposition [20]. Urquhart et al used other K + -conductor solid electrolyte (K-βAl2O3) in Fischer-Tropsch reaction studies under both atmospheric [21] and high pressure [22], and de Lucas-Consuegra et al introduced the use of this kind of ion-conducting catalyst support for the electrochemical promotion of Pt in CO [23] and propylene [24] oxidation, as well as in NOx reduction reactions [25,26]. More recent alkaline electrochemical promotion studies on CO2 hydrogenation [27][28][29][30] and methanol conversion reactions [31][32][33] should Vayenas et al performed the first electrochemical promotion study with alkaline solid electrolyte (Na-βAl 2 O 3 ) in 1991 [8].…”

Section: General Features Of Alkaline Electrochemical Promotionmentioning

confidence: 99%

“…In first place, all It should be noted that other characterization techniques such as X-ray photoelectron (XPS) [32] and Fourier transform infrared (FTIR) [24] spectroscopies have also been ex situ employed in the past to study the chemical state of the different alkali promoter species formed on the catalyst surface under EPOC conditions, obtaining similar information about the nature of the different promotional species.…”

Section: In Situ Characterization Of Alkali-promoted Catalyst Surfacesmentioning

confidence: 99%

See 2 more Smart Citations

A Review of Surface Analysis Techniques for the Investigation of the Phenomenon of Electrochemical Promotion of Catalysis with Alkaline Ionic Conductors

González‐Cobos

Lucas-Consuegra

2016

Catalysts

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Electrochemical Promotion of Catalysis (EPOC) with alkali ionic conductors has been widely studied in literature due to its operational advantages vs. alkali classical promotion. This phenomenon allows to electrochemically control the alkali promoter coverage on a catalyst surface in the course of the catalytic reaction. Along the study of this phenomenon, a large variety of in situ and ex situ surface analysis techniques have been used to investigate the origin and mechanism of this kind of promotion.In this review, we analyze the most important contributions made on this field which have clearly evidenced the presence of adsorbed alkali surface species on the catalyst films deposited on alkaline solid electrolyte materials during EPOC experiments. Hence, the use of different surface analysis techniques such as scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning photoelectron microscopy (SPEM), or scanning tunneling microscopy (STM), led to a better understanding of the alkali promoting effect, and served to confirm the theory of electrochemical promotion on this kind of catalytic systems. Given the functional similarities between alkali electrochemical and chemical promotion, this review aims to bring closer this phenomenon to the catalysis scientific community.

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Section: Ex Situ Characterization Of Alkali-promoted Catalyst Surfacesmentioning

confidence: 56%

Section: General Features Of Alkaline Electrochemical Promotionmentioning

confidence: 99%

Section: In Situ Characterization Of Alkali-promoted Catalyst Surfacesmentioning

confidence: 99%

See 1 more Smart Citation

A Review of Surface Analysis Techniques for the Investigation of the Phenomenon of Electrochemical Promotion of Catalysis with Alkaline Ionic Conductors

González‐Cobos

Lucas-Consuegra

2016

Catalysts

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“…These observations suggest that these sodium oxides were generated with spillover or backspillover oxygen ions and were responsible for the observed permanent EPOC effect. Similar alkali oxides/superoxides induced a permanent EPOC effect in a study by de Lucas-Consuegra et al [33], where a K-β′Al 2 O 3 solid electrolyte was used. It was shown by in-situ (cyclic voltammetry, FTIR) and ex-situ techniques (SEM–EDX) that potassium oxides were formed and stabilised on Pt, after electrochemically pumped potassium ions reacted with adsorbed oxygen.…”

Section: Resultsmentioning

confidence: 83%

Electrochemical Promotion of CO Oxidation on Na-Promoted Pt/YSZ: Interaction Between Multiple Promoting Species

Stavrakakis

Poulidi

2018

Top Catal

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The combined promotional effect of electrochemically-supplied O 2− and chemically-supplied Na + promoters, was studied for the case of CO oxidation on Pt/YSZ. Four different sodium coverages (0.16, 1.6, 8 and 40%) were loaded onto the catalyst surface and the catalytic behaviour was compared with a nominally 'clean' catalyst under a wide range of reactants' ratios under open-circuit and polarised conditions. Sodium generally increased oxygen adsorption by lowering the work function of the catalyst. However, sodium promoted the catalytic rate only at coverages up to 1.6% and worked synergistically with O 2− promoting species to an increased overall promotion of the catalytic rate. At higher sodium coverages, i.e. θ Na ≥ 8%, the catalytic behaviour was strongly affected by the interactions between the sodium species, the catalyst, the reactants and oxygen ions promoting species. The postulated formation of stable sodium oxide species on the catalyst pores reduced the active catalytic area which resulted in poisoning the catalytic rate and suppressing EPOC effect, respectively. It is suggested that these stable sodium oxide species which also induced a permanent EPOC effect by oxygen storage, were formed by the migrated oxygen ions.

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“…According to previous studies [24], the Pt mean particle size can be estimated by using the Scherrer's equation corresponding to the (1 1 1) peak, resulting in a Pt crystal size of 15 nm.…”

Section: Resultsmentioning

confidence: 99%

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

Lucas-Consuegra

Gutiérrez-Guerra

Endrino

et al. 2015

J Solid State Electrochem

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The development of novel configurations for the production of synthesis gas (syn-gas) of flexible H 2 /CO ratio is of great importance to reduce the cost for the synthesis of synfuels and high-value chemicals. In this work, we propose a radically novel approach to the direct production of syn-gas with flexible H 2 /CO ratio based on the solid electrolyte membrane reactor (SEMR). For that purpose, a single-chamber solid electrolyte membrane reactor based on yttria-stabilized zirconia (YSZ) has been developed (Pt/YSZ/Pt), where both active Pt catalysts-electrodes were exposed to the same reaction atmosphere (C 2 H 5 OH/H 2 O=0.7 %/2 %). The application of different polarizations at temperature range (600-700°C) allows to control the H 2 /CO ratio of the obtained syn-gas, i.e., the ratio was varied between 1.5 and 12 under polarization conditions. Unlike conventional catalytic partial oxidation processes, the H 2 /CO adjustment was managed without the requirement of external O 2 feeding to the reactor. An increase in the applied current or potential caused the H 2 /CO ratio to increase vs. the open-circuit conditions where ethanol reforming occurred on the Pt catalyst-electrodes which is due to an increase in the rate of the electro-catalytic processes. On the other hand, a decrease in the H 2 /CO ratio at a fixed potential was achieved at higher temperatures due to the further reaction of the produced H 2 with the rest of the species present in the gas phase, leading to a decrease in the faradaic efficiency. The proposed configuration may be of great interest especially for biorefinery applications where H 2 , syn-gas and electricity may be produced from bioethanol.

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Low-temperature propene combustion over Pt/K-βAl2O3 electrochemical catalyst: Characterization, catalytic activity measurements, and investigation of the NEMCA effect

Cited by 60 publications

References 42 publications

A Review of Surface Analysis Techniques for the Investigation of the Phenomenon of Electrochemical Promotion of Catalysis with Alkaline Ionic Conductors

A Review of Surface Analysis Techniques for the Investigation of the Phenomenon of Electrochemical Promotion of Catalysis with Alkaline Ionic Conductors

Electrochemical Promotion of CO Oxidation on Na-Promoted Pt/YSZ: Interaction Between Multiple Promoting Species

Direct production of flexible H2/CO synthesis gas in a solid electrolyte membrane reactor

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