Development of nanocrystalline mesoporous Pt promoted Co-based catalysts for carbon dioxide reforming of methane

Abstract

In this study, a series of mesoporous Co-Pt/TiO2-Al2O3 catalysts were synthesized and evaluated for CO2 reforming of methane for synthesis gas production. The physicochemical properties of catalysts were assessed using various analytical techniques. Results showed higher activity and stability for bimetallic Co-Pt/TiO2-Al2O3 catalysts than the corresponding monometallic catalysts. The synergistic combination of Co and Pt, with the TiO2 mixed oxide support, results in the fine-tuned catalysts for the sustainable production of syngas. The TiO2 supported catalysts didn't show any deposition of hard carbon. TiO2-Al2O3 support excellently prohibits the carbon deposition and sintering of metal up to 10 wt% of Co active metal loading. Further increasing the metal loading resulted in the deactivation of catalyst by coke deposition. The study revealed that the 5 wt% Co- 0.5 wt% Pt/TiO2-Al2O3 catalyst is an excellent catalyst for the dry reforming reaction. The fine distribution of Pt alongside Co metal in the bimetallic system promotes the dry reforming reaction. The maximum syngas production rate of 72 mL g−1 h−1 with 65% to 85% of reactants conversions was obtained at 700 °C and 1 bar. The generation of Co2+ species in Co/Al2O3 catalyst was the reason for activity loss, whereas the mixed oxide support supremely prevented the formation of Co2+ species.