Stability promotion of Ni/alpha-Al2O3 catalysts by tin added via surface organometallic chemistry on metals - Application in methane reforming processes
N. Nichio et al., Stability promotion of Ni/alpha-Al2O3 catalysts by tin added via surface organometallic chemistry on metals - Application in methane reforming processes, CATAL TODAY, 62(2-3), 2000, pp. 231-240
This paper reports the effect of selective tin addition to nickel catalysts
via a controlled technique (surface organometallic chemistry on metals, SO
MC/M), and the performance of the resulting systems in methane reforming pr
ocesses: partial oxidation (POM), CO2 reforming (R) and mixed (CO2 + O-2) r
eforming (MR), with particular emphasis on their resistance to coke formati
on. It is demonstrated that SOMC/M techniques allow to obtain well-defined
bimetallic phases in a controlled way. It is found that there is a range of
tin concentrations (0.01-0.05 wt.%) for which the stability of the bimetal
lic catalysts is markedly enhanced with respect to nickel catalyst, without
affecting either the activity level or the selectivity to syngas. These fa
cts are explained in terms of a more demanding nature in size of the active
sites needed for carbon formation reaction, when compared to methane activ
ation reaction to synthesis gas. (C) 2000 Elsevier Science B.V. All rights
reserved.