Bi-reforming of methane on Ni-based pyrochlore catalyst
2016 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 517, 211-216 p.Article in journal (Refereed) PublishedText
A Ni-based pyrochlore catalyst was synthesized using the modified Pechini method. In this method, 1 wt% Ni was doped into the La2Zr2O7 pyrochlore structure. The catalyst was characterized by H2-TPR, TPO, XRD, and EXAFS, and tested for its methane reforming activity under bi-reforming reaction conditions; i.e.; in the presence of CO2 and steam: 3CH4+CO2+2H2O⇌4CO+8H2 Repeated TPR/TPO cycles showed that the two consecutive TPR spectra do not change, showing that the catalyst is stable at high temperatures, and that the nickel oxidation/reduction process is reversible. The catalyst showed constant activity with time at all temperatures in the range of 700-950 °C over a cumulative period of 170 h. After this series of bi-reforming tests, TPO of the spent catalyst was carried out, which showed detectable but unquantifiable carbon deposition. The presence of steam in bi-reforming greatly limits carbon deposition compared to directly related dry-reforming tests on this same catalyst.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 517, 211-216 p.
Bi-reforming, Dry-reforming, Methane activation, Pyrochlore, Reforming, Syngas, Carbon dioxide, Catalyst activity, Catalysts, Deposition, Methane, Nickel, Reforming reactions, Dry reforming, Modified Pechini method, Pyrochlore structures, Pyrochlores, Reaction conditions, Reforming of methane, Syn-gas, Steam reforming
IdentifiersURN: urn:nbn:se:kth:diva-186970DOI: 10.1016/j.apcata.2016.03.016ISI: 000375162100023ScopusID: 2-s2.0-84961627476OAI: oai:DiVA.org:kth-186970DiVA: diva2:929910
QC 201605202016-05-202016-05-162016-05-20Bibliographically approved