چكيده به لاتين
Propane is a major component of gas condensate that has a high potential for hydrogen production at lower temperatures. Propane reforming is better than methane, due to the low conversion temperature and lower steam pressure and good source of hydrogen production. On the other hand, nickel metal is an acceptable catalyst in reforming processes that have high activity and are more stable against coking and sintering. Therefore, many efforts have been made to improve the selectivity, activity and sustainability of nickel-based catalysts in a variety of processes.
In this study, the MgAl2O4 support was synthesized co precipitation method at the ratio of stoichiometric MgO / Al2O3 = ½ in the propane reforming process. In the first part of this study, the amount of Ni loading in Ni / MgAl2O4 catalysts was investigated at 600 ° C and GHSV = 30000 ml / (gr.hr) and H2O / C3H8 = 3 . According to the results, increasing the amount of nickel loading increases the concentration of carbon in the catalyst, causing the catalyst to be inactivated. The results showed that a 10% nickel catalyst had better conditions than other samples. In the next section, a 10% nickel catalyst with different promoter of lanthanum, copper, iron and cerium in a constant weight of 3% was investigated. considering the results of the promoting catalysts with 3% wt of cerium under constant operating conditions, the highest propane conversion (93%), the highest hydrogen yields(0.63) Due to its low crystal size, high specific surface and very low carbon deposition rates were selected as high Efficiency catalysts. The synthesized catalysts were characterized by XRD, BET, FESEM and TGA / DTA analyzes. In the final section of this study, the weight percentages of the nickel in the range of (15% -5%) and the weight percentages the serum promoter in the range of (1% -5%) were optimized by the design experiment in 12 experiments. Optimum conditions were determined as 11.44% the weight percentages nickel, 55.3% the weight percentages cerium.
deactivating of catalyst 1%, propane conversion rate of 98%, and hydrogen production efficiency of 62% were obtained experimentally under optimum conditions and corresponded to the values obtained by the developed model.
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Keywords:
Propane Steam Reforming, Hydrogen, Nickel Catalyst, Promoter, Cerium Oxide
