OR3-52 Influence of the synthesis method on La2Ni2-xZrxO6 (x = 0; 1) perovskites for dry reforming of methane

Resumo

Perovskite-type oxides La₂Ni_2-xZr_xO₆ (x = 0; 1) were synthesized by the polymerization complex method and co-precipitation method. The perovskites were characterized by XRD and TGA aiming to evaluate the influence of the synthesis methods and the introduction of Zr on the catalytic properties for the dry reforming of methane (DRM) reaction. The biggest difference between the synthesis methods was the obtention of La(OH)₃ phases for those synthetized by co-precipitation. DRM performance was better over LN – p catalyst in all the temperature ranges studied, reaching conversions close to 90% and 70% of CH₄ and CO_2, respectively, and a H₂/CO ~ 1 at 750°C. LNZr – p catalyst had lower conversions than LN – p, however, CO₂ conversion was higher than CH₄ due to the Zr ability to react with CO₂. Both catalysts synthetized by co-precipitation, LN – c and LNZr – c, provided lower conversions compared to the catalysts synthetized by polymerization complex method. This behavior is probabl due to the higher concentration of hydroxyl groups (La(OH)₃).