CO methanation over TiO2-supported nickel catalysts: A carbon formation study
2015 (English)In: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 502, 276-286 p.Article in journal (Refereed) Published
A systematic study on titania-supported nickel catalysts was performed in order to evaluate the effect of different process conditions on catalyst stability. Reaction tests and temperature-programmed-hydrogenation analyses were used in order to evaluate the effect of temperature, feed composition, water and reduction conditions on catalyst deactivation and carbon deposition. It was shown that high H-2/CO ratios and syngas partial pressures decrease the rate of carbon formation. Moreover, increasing temperature enhanced the formation of more stable carbon species and thus catalyst deactivation. The temperature-programmed hydrogenation analyses also revealed that water reduces the rate of carbon deposition. However, water enhanced catalyst deactivation when the catalysts were reduced at high temperatures. This negative effect of water is probably due to a progressive destruction of the strong-metal-support interaction characteristic of titania-supported nickel catalysts reduced at high temperatures. (C) 2015 Elsevier B.V. All rights reserved.
Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 502, 276-286 p.
Methanation, Deactivation, Nickel, Titania, Carbon formation
IdentifiersURN: urn:nbn:se:kth:diva-174939DOI: 10.1016/j.apcata.2015.06.029ISI: 000361162200033ScopusID: 2-s2.0-84934759326OAI: oai:DiVA.org:kth-174939DiVA: diva2:861802
FunderSwedish Energy Agency
QZ 201510192015-10-192015-10-092016-08-17Bibliographically approved