Carbonaceous species formed during the reforming of CH4 with CO2 over a series of NixMg1-xO solid solution catalysts and MgO-supported Ni catalysts were characterized by temperature-programmed hydrogenation (TPH) method. Two peaks appeared in the TPH spectra: one between 550 and 700 K (α-carbon) and another above 873 K (β-carbon). It was found that a good relationship exists between the quantity of α-carbon species and the catalytic activity, indicating that α-carbon should be the reaction intermediate. In addition, the amount of β-carbon increased with increasing reaction time, especially on the supported Ni/MgO catalysts which make inactive carbon during the CH4-CO2 reforming reaction.
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