The influence of the support modification over Ni-based catalysts for dry reforming of methane reaction

5 wt.% Ni/CeZr0.5 wt.% Me (Rh, Ru) catalysts were synthesized by mixed sol-gel and impregnation method. Their catalytic activity was examined in dry reforming of methane reaction (DR) and compared with CeZrMe (Rh, Ru) parent catalysts prepared by sol-gel method. The as prepared fresh catalysts were characterized by XRD while the aged catalysts by XRD, TPO, TEM and Raman. It was found that the Rh and Ru were well incorporated into CeZr fluorite structure. Nickel was present in NiO form. Ni/CeZrRh catalyst demonstrated the highest activity reaching at 800 degrees C CH4 conversion near thermodynamic one. Ageing of the catalysts shows that the introduction of Rh into CeZr structure results in high activity and good stability even without Ni addition. However for CeZrRu catalyst deactivation is observed. The subsequent impregnation of Ni over CeZrRu catalyst leads to the considerable increase in its stability. (C) 2010 Elsevier B.V. All rights reserved.