Reforming of methane by CO₂ over bimetallic Ni-Mn/γ- Al₂O₃ catalyst

γ-Al₂O₃ supported Ni-Mn bimetallic catalysts for CO₂ reforming of methane were prepared by impregnation method. The reforming reactions were conducted at 500-700 °C and atmospheric pressure using CO₂/CH₄/N₂ with feed ratio of 17/17/2, at total flow rate of 36 mL/min. The catalytic performance was assessed through CH₄ and CO₂ conversions, synthesis gas ratio (H₂/CO) and long term stability. Catalytic activity and stability tests revealed that addition of Mn improved catalytic performance and led to higher stability of bimetallic catalysts which presented better coke suppression than monometallic catalyst. In this work, the optimum loading of Mn which exhibited the most stable performance and least coke deposition was 0.5wt%. The fresh and spent catalysts were characterized by various techniques such as Brunauer-Emmett-Teller, the temperature programmed desorption CO ₂-TPD, thermogravimetric analysis, X-ray diffraction, scanning electron microscope, EDX, and infrared spectroscopy.