Study of the reverse water gas shift (RWGS) reaction over Pt in a solid oxide fuel cell (SOFC) operating under open and closed-circuit conditions

Pekridis, G.; Kalimeri, Krystallia; Kaklidis, N.; Vakouftsi, E.; Iliopoulou, Eleni F.; Athanasiou, C.; Marnellos, George

doi:10.1016/j.cattod.2007.05.026

Cited by 67 publications

(51 citation statements)

References 27 publications

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“…The fact that similar CO yields were obtained during the second and third cycles indicates that no deactivation was apparent. The thermal stability shown by Pt was expected based on previous reports [16,[27][28][29]. The CO yields obtained with the Pt/SDC catalyst in Figure 6 were superior to those obtained with the Pt/YSZ catalyst in Figure 4.…”

Section: Catalytic Performancesupporting

confidence: 79%

“…Other reaction results have also been correlated with oxygen vacancies. For example, the results Pekridis et al [16] obtained using a solid oxide fuel cell (SOFC) at 650-800 ∘ C were explained in terms of oxygen vacancies.…”

Section: Catalytic Performancementioning

confidence: 99%

“…Catalysts are often supported on materials such asAl 2 O 3 , SiO 2 , and C. Yttria-stabilized zirconia, YSZ, and samarium-doped ceria, SDC, are two less common supports that have shown potential for the RWGS reaction [15,16] [17]. It is also used for the electrochemical promotion of catalysts, EPOC [18].…”

Section: Introductionmentioning

confidence: 99%

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Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction

Lortie

Isaifan

2015

Journal of Catalysts

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Cu 50 Ni 50 nanoparticles were synthesized using a modified polyol method and deposited on samarium-doped ceria, SDC, and yttria-stabilized zirconia, YSZ, supports to form reverse water-gas shift, RWGS, catalysts. The best CO yields, obtained with the Cu 50 Ni 50 /SDC catalyst, were about 90% of the equilibrium CO yields. In contrast CO yields using Pt/SDC catalysts were equal to equilibrium CO yields at 700 ∘ C. Catalyst selectivity to CO was 100% at hydrogen partial pressures equal to CO 2 partial pressures, 1 kPa, and decreased as methane was formed when the hydrogen partial pressure was 2 kPa or greater. The reaction results were explained using a combination of Eley-Rideal and Langmuir-Hinshelwood mechanisms that involved adsorption on the metal surface and the concentration of oxygen vacancies in the support. Finally the Cu 50 Ni 50 /SDC catalyst was found to be thermally stable for 48 hours at 600/700 ∘ C.

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Section: Catalytic Performancesupporting

confidence: 79%

Section: Catalytic Performancementioning

confidence: 99%

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Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction

Lortie

Isaifan

2015

Journal of Catalysts

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“…EPOC has been studied in a number of hydrogenation reactions [4], including CO 2 hydrogenation reaction under atmospheric pressure over Cu interfaced to SrZr 0.9 Y 0.1 O 3-a , a proton conductor [5], over Pt interfaced to ZrO 2 (8 mol%Y 2 O 3 ) or YSZ, an O 2-conductor [6] and over Pd interfaced to YSZ or b 00 -Al 2 O 3 , a sodium ion conductor [4,7]. The present work concerns the electrochemical promotion of the CO 2 hydrogenation reaction over Rh catalystelectrodes interfaced to YSZ, combined with kinetic measurements, under atmospheric pressure and at temperatures 328-477°C.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical promotion of CO2 hydrogenation on Rh/YSZ electrodes

2008

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The electrochemical promotion of the CO 2 hydrogenation reaction on porous Rh catalyst-electrodes deposited on Y 2 O 3 -stabilized-ZrO 2 (or YSZ), an O 2-conductor, was investigated under atmospheric total pressure and at temperatures 346-477°C, combined with kinetic measurements in the temperature range 328-391°C. Under these conditions CO 2 was transformed to CH 4 and CO. The CH 4 formation rate increased by up to 2.7 times with increasing Rh catalyst potential (electrophobic behavior) while the CO formation rate was increased by up to 1.7 times with decreasing catalyst potential (electrophilic behavior). The observed rate changes were non-faradaic, exceeding the corresponding pumping rate of oxygen ions by up to approximately 210 and 125 times for the CH 4 and CO formation reactions, respectively. The observed electrochemical promotion behavior is attributed to the induced, with increasing catalyst potential, preferential formation on the Rh surface of electron donor hydrogenated carbonylic species leading to formation of CH 4 and to the decreasing coverage of more electron acceptor carbonylic species resulting in CO formation.

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“…46 In case of Pt/YSZ (yttrium-stabilized zirconia), the rate-determining step of the RWGS reaction is the formation of surface-bound carbon and its interaction with adsorbed hydrogen. 47 The observation is due to the combination of direct electrocatalysis (electrodecomposition of CO 2 , electro-oxidation of H 2 ) and electrochemical promotion. For Pd/YSZ, CO formation is improved by up to 6 times upon employing either negative or positive overpotentials.…”

Section: Reactor Aspectsmentioning

confidence: 99%

Recent advances in catalytic hydrogenation of carbon dioxide

et al. 2011

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Owing to the increasing emissions of carbon dioxide (CO 2 ), human life and the ecological environment have been affected by global warming and climate changes. To mitigate the concentration of CO 2 in the atmosphere various strategies have been implemented such as separation, storage, and utilization of CO 2 . Although it has been explored for many years, hydrogenation reaction, an important representative among chemical conversions of CO 2 , offers challenging opportunities for sustainable development in energy and the environment. Indeed, the hydrogenation of CO 2 not only reduces the increasing CO 2 buildup but also produces fuels and chemicals. In this critical review we discuss recent developments in this area, with emphases on catalytic reactivity, reactor innovation, and reaction mechanism. We also provide an overview regarding the challenges and opportunities for future research in the field (319 references).

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Study of the reverse water gas shift (RWGS) reaction over Pt in a solid oxide fuel cell (SOFC) operating under open and closed-circuit conditions

Cited by 67 publications

References 27 publications

Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction

Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction

Electrochemical promotion of CO2 hydrogenation on Rh/YSZ electrodes

Recent advances in catalytic hydrogenation of carbon dioxide

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