CO 2 reforming of methane over Ce-Zr-Ni-Me mixed catalysts

Abstract

Pseudo sol–gel method was applied to prepare monometallic as well as bimetallic catalysts, on the base of Ce-Zr mixed oxide, effective for dry reforming of methane. The monometallic catalysts with varying proportions of Ce and Zr and constant Ni loading (5 wt.%) were made to find the most effective system. On the basis of the results of the activity of the monometallic catalysts, three bimetallic catalysts were synthesised, where part of Ni was substituted by Co, Fe or Rh. The as prepared catalysts were characterized by powder X-ray diffraction (XRD), thermo-programmed reduction (TPR) and examined in CO 2 reforming of methane reaction. It was found that Ce 2Zr 1.51Ni catalyst demonstrated the highest activity in CO 2 reforming of CH 4 among all the monometallic catalysts with CO 2 conversion ca. 80% at 750 °C. Ageing of the catalyst during 25 h time on stream conducted to the decrease of CO 2 conversion from 80% to 57% (750 °C). In the case of Ce 2Zr 1.51NiRh catalyst CO 2 conversion increased up to 90% (750 °C). The ageing experiment demonstrated very high stability over 200 h with the conversion of 80%.