Effect of metal loading on activity, selectivity and deactivation behavior of Pd/silica-alumina catalysts in the hydroconversion of n-hexadecane
2014 (English)In: Catalysis Today, ISSN 0920-5861, E-ISSN 1873-4308, Vol. 223, 87-96 p.Article in journal (Refereed) Published
Bifunctional catalysts consisting of palladium on amorphous silica-alumina with different metal loadings (0 wt% to 1.2 wt%) were compared in the hydrocracking/hydroisomerization of n-hexadecane. The reaction conditions were: pressure = 30 bar; temperature = 310 degrees C; hydrogen-to-hexadecane feed molar ratio = 10. Metal loading was found to have a remarkable influence on the initial deactivation rate, which could be related to the formation of carbonaceous deposits. The dependence of activity on the metal-acid site ratio was the typical one for bifunctional hydrocracking where, after reaching a threshold value, the catalytic activity does not appreciably increase with increasing metal loading. On the Pd-containing catalysts, the methane space-time-yield showed a strong dependence on conversion, but no clear relationship with metal surface area, indicating that the formation of methane might not proceed by purely metal-catalyzed hydrogenolysis.
Place, publisher, year, edition, pages
2014. Vol. 223, 87-96 p.
Hydrocracking, Hydroisomerization, Hexadecane, Palladium, Silica-alumina
Other Chemical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-129965DOI: 10.1016/j.cattod.2013.08.028ISI: 000329980700011ScopusID: 2-s2.0-84892817823OAI: oai:DiVA.org:kth-129965DiVA: diva2:653925
FunderSwedish Energy Agency
QC 20140213. Updated from accepted to published.2013-10-072013-10-072014-02-13Bibliographically approved