2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 10: Vayenas Intl. Symp. / Physical Chemistry and its applications for sustainable development
| Editors: | Vayenas Intl. Symp. / Physical Chemistry and its applications for sustainable development Edited by: F. Kongoli, E. Aifantis, C. Cavalca, A. de Lucas Consuegra, A. Efstathiou, M. Fardis, D. Grigoriou, A. Lemonidou, S.G. Neophytides, Y. Roman, M. Stoukides, M. Sullivan, P. Vernoux, X. Verykios, I. Yentekakis |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2019 |
| Pages: | 249 pages |
| ISBN: | 978-1-989820-09-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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High Temperature Proton and Co-Ionic Electrochemical Membrane Reactors a) Co2/H2o Co-Electrolysis and b) Nh3 Synthesis
Ioannis Garagounis1; Vasileios Kyriakou2; Anastasios Vourros1; Demetrios Stoukides1; Michael Stoukides1;1ARISTOTLE UNIVERSITY, Thessaloniki, Greece; 2DUTCH INSTITUTE FOR FUNDAMENTAL ENERGY RESEARCH (DIFFER), Eindhoven, Netherlands;
Type of Paper: Keynote
Id Paper: 46
Topic: 53
Abstract:
Solid state proton conductors can operate at high temperatures (> 500 oC) and have been applied in the construction of sensors, fuel cells and hydrogen separators. In the past two decades, they have also been used in the construction of electrochemical membrane reactors. The advantage of high temperature conductors, versus those operating at low temperatures, is that they operate in the temperature range within which a large number of industrially important catalytic hydro-reactions and dehydrogenation reactions take place. In most of the earlier applications of electrochemical membrane reactors in catalytic research, the reaction of interest took place on the working electrode while the counter electrode served for the formation of protons from a hydrogen containing compound.
These electrochemical reactors, however, would become more competitive if useful chemicals were produced on both, working and counter electrodes [1, 2]. Results on two reaction systems in which both, cathode and anode were properly utilized are presented here. The first is the production of methanol and oxygen from CO2 and H2O. Steam and CO2 are introduced at the anode and cathode side, respectively, of a co-ionic (H+ and O2-) conductor. Steam is electrolyzed to form O2 and protons (H+). The latter are transferred to the cathode and react with CO2 to form CH3OH. The second system is an electrochemical Haber-Bosch (H-B) Process [3]. A mixture of steam and methane is fed to the anode chamber. Nitrogen is fed over the cathodic electrode. Hydrogen produced at the anode is "pumped" electrochemically (in the form of protons) to the cathode, where it reacts with N2 to produce NH3. A preliminary energy analysis indicates that, at faradaic efficiencies above 30% and at cell bias as low as 0.4 V, the electrochemical H-B becomes more efficient than the conventional H-B Process with respect to both, energy consumption and CO2 emissions.
Keywords:
Electrochemistry; Heterogeneous catalysis; Catalyst electrode; Faradaic efficiency;References:
[1] S.H. Morejudo, R. Zanon, S. Escolastico, I. Yuste, H. Malerød-Fjeld, P.K. Vestre, W.G. Coors, A. Martínez, T. Norby, J.M. Serra, C. Kjølseth, Science, 353 (2016) 563-566.[2] A.Vourros, V. Kyriakou, I. Garagounis, E. Vasileiou, M. Stoukides, Solid State Ionics, 306 (2017) 76-81.
[3] V. Kyriakou, I. Garagounis, E. Vasileiou, A. Vourros, M. Stoukides, Catalysis Today, 286 (2017) pp. 2-13.