Abstract
In a previous paper, it was demonstrated that a 1 wt% Rh catalyst supported on modified ZrO2 exhibits a high activity and stability in REGR conditions. The purpose of the present study was to investigate the main reactions involved in REGR conditions in the presence of this catalyst, namely steam reforming (SR), dry reforming (DR), and the reactions producing methane, i.e. methanation, decomposition and hydrogenolysis. Isooctane (C8H18) was used as a molecule representative of gasoline, and a mixture of N2, H2O, CO2 and O2 as model exhaust gas. A reaction scheme was proposed for REGR conditions. Based on the study of individual reactions (SR, DR and methane formation) at 450 °C, 520 °C and 580 °C, the complex system can be described following three consecutive steps: reforming reactions, yielding H2 and CO2 as primary products; reverse water gas shift (RWGS), yielding CO as secondary product; and finally methanation reactions, specially with CO, yielding CH4 as tertiary product.
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