Title Electrochemical Activation of Ni Catalysts with Potassium Ionic Conductors for CO2 Hydrogenation
Authors Gutierrez-Guerra, N. , Gonzalez-Cobos, J. , SERRANO RUIZ, JUAN CARLOS, Valverde, J. L. , de Lucas-Consuegra, A.
External publication Si
Means Top. Catal.
Scope Article
Nature Científica
JCR Quartile 2
SJR Quartile 1
JCR Impact 2.35500
SJR Impact 0.92600
Publication date 01/11/2015
ISI 000363941200011
DOI 10.1007/s11244-015-0488-4
Abstract Three different kind of Ni-based catalysts were prepared on a K-beta \'\' Al2O3 solid electrolyte by combining the annealing of an organometallic paste and the addition of a catalyst powder. The different catalysts films were tested in the CO2 hydrogenation reaction under electrochemical promotion by K+ ions, and were characterized by XRD and SEM. The catalyst film derived from the addition of an alpha-Al2O3 powder to the Ni catalyst ink presented the highest catalytic activity as a result of the increase in Ni catalyst film porosity. The influence of the applied potential and other operation variables were evaluated on the Ni catalytic activity and selectivity. Hence, the CO production rate was enhanced either by decreasing the applied potential (with the consequent supply of K+ ions to the catalyst surface) or by increasing the CO2 (electron acceptor) feed concentration. On the other hand, CH4 production rate was favoured at positive potentials (removing K+ from the catalyst surface) or by increasing the H-2 (electron donor) feed concentration. The global CO2 consumption rate increased upon negative polarization in all experiments and the electrochemical promotion of catalysis effect showed to be reversible and reproducible. Hence, the electrochemical promotion phenomena demonstrated to be a very useful technique to in situ modify and control the catalytic activity and selectivity of a non-noble metal such as Ni for the production of CH4 or syngas via CO2 valorization.
Keywords EPOC; CO2 removal; Reverse water gas shift; Methanation; Ni catalyst; Syn-gas
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