Kinetic investigation of CO 2 reforming of CH 4 over La–Ni based perovskite

Abstract

The kinetic behavior of the LaNiO 3 catalyst in the reforming reaction of methane with carbon dioxide was investigated as a function of temperature and partial pressures of CH 4 and CO 2. There are two kinds of active sites on the catalyst surface. In the first Ni reacts with CH 4 and in the second kind La 2O 3 reacts with CO 2. XRD pattern of the spent catalyst has shown that the phase La 2O 2CO 3 has formed which confirmed displayed mechanism. A reaction rate based on the mechanistic results was developed which predicts the experimental reaction rate with a good accuracy. Moreover, the kinetic behavior of LaNiO 3 was compared with the Ni/La 2O 3, Rh/La 2O 3 catalysts in the reforming reaction of methane with carbon dioxide at different temperatures and partial pressures of CH 4 and CO 2. These three catalysts have shown the same mechanism and the coefficients of rate equation for each one has been estimated by genetic algorithm. The results showed that Rh/La 2O 3 and LaNiO 3 posses more activity than Ni/La 2O 3at higher range of reaction temperature.