Electrochemical Activation of Ni Catalysts with Potassium Ionic Conductors for CO2 Hydrogenation

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

“…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]. From this pioneer work, Na + -conductors have been widely employed in many catalytic systems such as ethylene [9,10], CO [11], propane [12] and propylene oxidation [13], NO reduction [14][15][16], Fischer Tropsch synthesis [17], or hydrogenation of benzene [18] and CO 2 [19].…”

“…Urquhart et al used other K + -conductor solid electrolyte (K-βAl 2 O 3 ) 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 NO x reduction reactions [25,26]. More recent alkaline electrochemical promotion studies on CO 2 hydrogenation [27][28][29][30] and methanol conversion reactions [31][32][33] should also be highlighted. Additionally, in order to understand the mechanism of the phenomenon of electrochemical promotion of catalysis with both anionic and cationic conductors, a wide variety of characterization techniques have been used in the fields of catalysis (e.g., TPD, TPO, or work function measurement), electrochemistry (e.g., cyclic/linear sweep voltammetry or impedance spectroscopy), and surface science (e.g., XPS, UPS, SPEM, or STM) [3].…”

Electrochemical promotion of a dispersed Ni catalyst for H2 production via partial oxidation of methanol

“…For instance, Usman et al calculated Ni particle sizes between 23 and 40 nm from the XRD spectra [21]. It should also be noted that the obtained value of Ni particle size is lower than that obtained in a pure Ni catalyst film prepared by a similar deposition procedure (cathodic arc deposition), i.e., 31-35 nm [11], and than those obtained in other studies with less dispersed Ni catalyst films prepared by conventional methods like decomposition of a Ni organometallic paste [39] or impregnation of a precursor solution [40], which led to particle sizes between 30 and 100 nm.…”

Enhancement of Ammonia Synthesis on a Co3Mo3N-Ag Electrocatalyst in a K-βAl2O3 Solid Electrolyte Cell

“…The effect of electrochemical promotion is more clearly observed when the promoting species are neither reactants nor products of the catalytic reaction. In the last two decades, several catalytic reactions have been shown to be electrochemically promoted in alkaline SECRs. ,, In these studies, some unique advantages of the electrochemical vs the chemical promotion of alkali metals have been identified, which include among others, the in situ optimization of the alkali promoter coverage and tuning of product selectivities, as well as the permanent promotion effect …”

“…15,16,20 In these studies, some unique advantages of the electrochemical vs the chemical promotion of alkali metals have been identified, which include among others, the in situ optimization of the alkali promoter coverage and tuning of product selectivities, as well as the permanent promotion effect. 21 Despite the aforementioned advantages, to this day, no alkaline cationic conductor has been employed for the study of EPOC in ammonia synthesis. Hence, the aim of this work is to investigate the electrochemical enhancement of the ammonia synthesis rate on a Co 3 Mo 3 N nitride catalyst by using a K-β″-Al 2 O 3 potassium conductor under atmospheric total pressure.…”