Simulation Analysis for Design of H-2/N-2 Ratio of Feed Gas to Ammonia Synthesis Process Using Ru/CeLaTiOx Catalyst

In this study, we investigated the catalytic performanceand kineticmodel of novel lanthanoid oxide-supported Ru catalysts for NH3 synthesis in mild conditions (P & LE;8 MPa, T & LE; 425 & DEG;C), Ru/Ce0.5La0.4Ti0.1Ox (termed as Ru/CeLaTiOx). It was found that Ru/CeLaTiOx significantlyoutperformed conventional Ru/MgO and Ru/CeO2 catalystsacross the evaluated operating conditions. High NH3 synthesisrates up to & SIM;30 mmol g(cat) (-1) h(-1) were attainable under conditions of 400 & DEG;C,5 MPa, and H-2/N-2 ratios between 1.0 and 1.5.Optimization of the Langmuir-Hinshelwood (LH) kinetic modelincorporating nitrogen hydride (NHx) adsorption was performed,which revealed their strong influence compared to adsorbed N and Hadatoms as intermediate species. Further, the model kinetics showedfavorable dependence toward N-2 and H-2 concentrations,which highlights operational advantage of the introduced catalystsfor renewable-derived NH3 synthesis over the currentlycommercial Fe and Ru catalysts. Process simulation analysis incorporatingthe above-mentioned catalysts and heat recovery system was performed,which attained predicted process efficiency and specific energy consumptionof 62.8% and 8.32 GJ/ton NH3 for the synthesis loop, respectively.