Abstract
The activity of mixed steam and CO 2 reforming of CH 4 to produce synthesis gas was investigated and compared with those of steam reforming alone and CO 2 reforming alone at 600–900°C under atmosphere pressure on MgO-supported noble metals. Mixed reforming shows a far lower CH 4 conversion than the value for thermodynamic equilibrium. The activity decreases following the order Ru,Rh > Ir > Pt,Pd. Little deactivation was observed for Ru, Rh and Ir catalysts. An isotope labelled 13CO 2 experiment was carried out in situ for mixed reforming on Rh/MgO and the results suggest that CO 2 dissociates as CO-M and O-M. The results of the temperature program reaction (TPR) of mixed reforming shows that CH 4 adsorbs and dissociates before reaction starts and that CO 2 reforming and steam reforming start simultaneously. A possible reaction mechanism is discussed.
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