چكيده به لاتين
In the recent world, most of the energy need is supplied through the burning of fossil fuels which releases a high amount of greenhouse gases into the atmosphere. For decreasing these greenhouse gases emissions, hydrogen can serve as a suitable energy carrier. There are different methods for the production of hydrogen, between these methods thermocatalytic decomposition of methane is a process that can produce pure hydrogen. In this study, the employed catalyst in the thermocatalytic decomposition of methane process is NiO-MgO. This mixed oxide was used due to low cost, better activity, and stability of nickel and coke formation resistance of magnesium. First, x wt%NiO-MgO catalysts (x=20, 30, 40, 50) were synthesized by the mechanochemical method and their performance was tested in this process. The 50NiO-MgO catalyst showed better activity (40% conversion) and chose as the optimal catalyst. Also, the effect of different parameters such as feed ratio, GHSV, and calcination temperature was studied on this catalyst activity. The major challenge in this process is the deactivation of catalysts due to the carbon deposition over the catalyst surface, which could be avoided by promoter doping. In the second part of this study, the effect of Cu and Cr as promoters was studied. For this purpose, the 5, 10, and 15 wt% of these metals were doped with 50NiO-MgO catalyst and used in this process. The result exhibited that the 50NiO-MgO-15Cr2O3 owned better activity (64% conversion) and stability.
