Non-Faradaic electrochemical activation of catalysis

Vayenas, C.G.; Koutsodontis, C.

doi:10.1063/1.2824944

Cited by 104 publications

(97 citation statements)

References 72 publications

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“…However, the utilization of electrochemistry in the reactor design is cost efficient and environmentally friendly to industrial processes with a minimum of waste production and toxic materials. 87 CO 2 hydrogenation using YSZ solid electrolyte and Rh electrode was studied in a single chamber reactor. 88 CO and CH 4 were produced at temperatures of 346-477 1C, and the rates of CH 4 and CO formation were enhanced with positive potentials (electrophobic behavior) and negative potentials (electrophilic behavior), respectively.…”

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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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confidence: 99%

Recent advances in catalytic hydrogenation of carbon dioxide

et al. 2011

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“…The EPOC effect has been investigated extensively for more than seventy catalytic systems using a variety of catalytic reactions and metal or metal oxide catalysts [20,21]. It has been found using numerous electrochemical and surface science techniques [20,21] that EPOC originates from the electrochemically controlled backspillover of ionic promoting species (O 2-in case of YSZ and TiO 2 ) which migrate from the electrolyte support to the metal/gas interface during polarization [20,21]. Two parameters are commonly used to quantify the magnitude of the EPOC effect:…”

Section: Introductionmentioning

confidence: 99%

The role of TiO2 layers deposited on YSZ on the electrochemical promotion of C2H4 oxidation on Pt

et al. 2010

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The electrochemical promotion of Pt/YSZ and Pt/TiO 2 /YSZ catalyst-electrodes has been investigated for the model reaction of C 2 H 4 oxidation in an atmospheric pressure single chamber reactor, under oxygen excess between 280 and 375°C. It has been found that the presence of a dispersed TiO 2 thin layer between the catalyst electrode and the solid electrolyte (YSZ), results in a significant increase of the magnitude of the electrochemical promotion of catalysis (EPOC) effect. The rate enhancement ratio upon current application and the faradaic efficiency values, were found to be a factor of 2.5 and 4 respectively, higher than those in absence of TiO 2 . This significantly enhanced EPOC effect via the addition of TiO 2 suggests that the presence of the porous TiO 2 layer enhances the transport of promoting O 2-species onto the Pt catalyst surface. This enhancement may be partly due to morphological factors, such as increased Pt dispersion and three-phase-boundary length in presence of the TiO 2 porous layer, but appears to be mainly caused by the mixed ionic-electronic conductivity of the TiO 2 layer which results to enhanced O 2-transport to the Pt surface via a self-driven electrochemical promotion O 2-transport mechanism.

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“…Although the deactivation of LaFeO 3 catalyst is usually attributed to grain sinterization, which depends largely on temperature, time exposure and nature of the reducing environment, among other factors, the catalytic activity decay may result from the promotion of water gas shift reactions (RWGS), mildly exothermic, which occurs rapidly in presence of iron catalysts at temperatures above 400 °C [32] …”

Section: Post-reaction Analysismentioning

confidence: 99%

One-step hydrothermal synthesis of LaFeO3 perovskite for methane steam reforming

Cuaspud

López

Castelló

et al. 2016

Reac Kinet Mech Cat

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This work describes the synthesis of LaFeO 3 oxide, using a one-step hydrothermal synthesis route, to obtain a solid exhibiting superficial, morphological and textural properties useful for potential applications. The synthesis process starts from corresponding metal nitrates of lanthanum and iron in well-defined concentration and KOH as mineralizing agent. The reaction is developed in a Teflon-lined stainless steel autoclave at 300 °C for 14 days. The composition and surface area were determined with X-ray fluorescence (XRF) and nitrogen adsorption isotherms (BET), verifying the obtaining of a stoichiometric, high, and active phase of oxide. The crystalline structure was evaluated with X-ray diffraction analysis (XRD), showing a pure orthorhombic perovskite phase. TPR results show the development of three single steps at different temperatures, kinetically detectable and related with reduction of component oxides. Scanning and transmission electron microscopy (SEM-TEM) results showed a remarkable degree of crystallization, favouring a specific morphology as a result of the low consolidation temperature of the perovskite phase. Catalytic test by means of methane reaction, performed along 240 on stream, reveals a light deactivation rate, decreasing progressively 7.1% until 60% of methane conversion, indicating the improved morphological and surface characteristics for potential applications.

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Non-Faradaic electrochemical activation of catalysis

Cited by 104 publications

References 72 publications

Recent advances in catalytic hydrogenation of carbon dioxide

Recent advances in catalytic hydrogenation of carbon dioxide

The role of TiO2 layers deposited on YSZ on the electrochemical promotion of C2H4 oxidation on Pt

One-step hydrothermal synthesis of LaFeO3 perovskite for methane steam reforming

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