THE KINETIC STUDY OF CO2 REFORMING WITH CH4 USING La2O3 PROMOTED COBALT SUPPORTED ALUMINA CATALYST

Abstract

The CO₂ reforming reaction has recently emerged as a promising method for producing syngas from CO₂-rich natural gas. Whereas the Co-based materials with the addition of promoter appeared to be potential catalysts and gained much attention since they not only own considerable catalytic activity for CO₂ reforming reaction but are also suitable for large-scale applications. The performance of 5%La-10%Co/Al₂O₃ catalyst in CO₂ reforming reaction at various reaction temperatures while alternating initial partial pressure of CH₄ and CO₂ have been studied. The catalytic evaluation revealed that the excessive presence of CH₄ could facilitate the direct CH₄ decomposition resulting in catalyst active site blockage. The increment of also gave rise to greater CH₄ adsorption on the catalyst surface, consequently elevating the CO₂ intake through the reaction. The increase of provoked the gasification rate improvement of deposited carbon from methane dissociation, therefore motivating the CH₄ conversion. The consumption rate of CH₄ was evidenced to be more sensitive toward the changes in reaction temperature than CO₂. The CO₂ reforming reaction performed over 5%La-10%Co/Al₂O₃ catalyst was convinced to follow an associative adsorption mode of CH₄ and CO₂ on dual or different active sites and the catalyst exhibited a good stability during 48 h reaction at 1023 K.