caa a22 4500 606174451 CHVBK 20210128100738.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s11244-015-0493-7 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0493-7 Applications of the Electrochemical Promotion of Catalysis in Methanol Conversion Processes [Elektronische Daten] [J. González-Cobos, D. López-Pedrajas, E. Ruiz-López, J. Valverde, A. de Lucas-Consuegra] In this work, three possible applications of the phenomenon of electrochemical promotion of catalysis (EPOC) are demonstrated for methanol conversion processes: enhancement of the catalytic activity, modification of the catalytic selectivity and partial oxidation of the catalyst. For that purpose, a Ni catalyst film prepared via a physical vapour deposition technique was electrochemically promoted by K+ in different methanol conversion reactions for hydrogen production. Under methanol decomposition and steam reforming conditions, application of certain negative overpotentials and subsequent back-spillover of K+ promoter ions led to an increase in the Ni catalytic activity through electrophilic EPOC behaviour. On the other hand, under methanol partial oxidation conditions, the K+ ions caused a decrease in the catalytic selectivity toward H2 and CO while they favoured selectivity toward CO2 and H2CO. This effect was explained by an increase in the Ni oxidation state due to O2 activation induced by K+ ions, as shown by post-reaction X-ray diffraction analysis. All the potassium-induced effects were reversible between negative and positive polarizations. This shows the different possibilities of the EPOC phenomena on nickel catalysts in heterogeneous catalysis. Specifically, the in situ modification of catalytic activity and selectivity in methanol conversion reactions would be interesting for on-board hydrogen production processes, where the attenuation of catalyst deactivation and the control of metal oxidation state would also play a key role. Springer Science+Business Media New York, 2015 Electrochemical promotion nationallicence Electrocatalysis nationallicence H2 production nationallicence Cathodic arc deposition nationallicence Methanol conversion nationallicence Non noble metal nationallicence González-Cobos J. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut López-Pedrajas D. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut Ruiz-López E. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut Valverde J. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut de Lucas-Consuegra A. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/18-20(2015-11-01), 1290-1302 1022-5528 58:18-20<1290 2015 58 11244 https://doi.org/10.1007/s11244-015-0493-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0493-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- González-Cobos J. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut NATIONALLICENCE 700 1- López-Pedrajas D. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut NATIONALLICENCE 700 1- Ruiz-López E. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut NATIONALLICENCE 700 1- Valverde J. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut NATIONALLICENCE 700 1- de Lucas-Consuegra A. Department of Chemical Engineering, School of Chemical Sciences and Technology, University of Castilla-La Mancha, Avda. Camilo José Cela 12, 13005, Ciudad Real, Spain aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/18-20(2015-11-01), 1290-1302 1022-5528 58:18-20<1290 2015 58 11244