Abstract
Mesoporous mixed oxides supports were impregnated with solutions of Pt
or Ru compounds. The catalytic performance and stability were evaluated
in dry reforming of methane. The catalysts were characterized by X-ray
diffraction (XRD), nitrogen adsorption-desorption isotherms, temperature
programmed reduction (TPR), High-resolution transmission electron
microscopy (HRTEM) and Transmission electron microscopy (TEM) analyses
and Raman spectroscopy. Promoters such as MgO, ZrO2, CeO2 and La2O3 were
added to alumina support and exhibited distinct behaviour, when Ru or Pt
was dispersed on these solids. Catalysts based on Pt-containing CeO2
Al2O3 showed a relatively high catalytic activity and stability compared
to the other solids. The influences of the temperature and CH4/CO2 on
the catalytic behaviour of the most active solids were also studied. The
coking takes place due to carbonaceous deposition, but no significant
loss of activity was observed during 24 h for some catalysts, which
suggest the carbon species formed did not damage the solid. (C) 2013
Elsevier B.V. All rights reserved.
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