Study of CO2 and H2O adsorption competition in the combined dry / steam reforming of biogas

The combined dry-steam reforming (CDSR) of a model biogas (66 % CH4 + 34 CO2) has been investigated under various feed compositions and reaction temperature conditions over Ni-Rh/MgAl2O4 catalyst, with the objective to convert excess methane (compared by steam (SR). Methane, however, appeared react preferentially H2O rather than CO2, leading an inhibition dry (DR) in presence steam. CO2 adsorption co-adsorption studies revealed that was always adsorbed much higher amounts on catalyst surface. A Temkin applied temperature-programmed experiments (TPAE) showed two different strongly species were present surface at moderate temperature, but only one each remained temperatures relevant (600?800 °C). also shown displace from surface, confirming they compete, least partially, for same sites. At high coverage most predominant. These results should contribute development efficient catalytic processes valorization produce syngas hydrogen renewable sources.