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Synthesis of Alumina Support Modified with X and Y Zeolites as a Catalyst of Diesel Hydrodesulfurization Process
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Soltanali, Saeed (Supervisor) ; Rashidzadeh, Mehdi (Co-Supervisor)
Abstract
Environmental destructive effects of gases caused by combustion of sulfur compounds in the fuel, poisoning of catalysts, corrosion of equipment, as well as intensification of environmental considerations and new standards adopted for maximum sulfur content has made the desulfurization of fuels important; The desulfurization method using hydrogen has a high potential to remove sulfur. One of the major challenges in this process is to find the proper catalyst that has the best performance for this process. Ni (or Co) Mo (or W)/ γ-Al2O3 catalysts have high potential for using as a catalyst for the desulfurization process from a variety of large-scale or industrial hydrocarbon cuts. According to...
Synthesis of Alumina–Zeolite Composite as Catalytic Supports for Hydrodesulfurization of Gas oil
, M.Sc. Thesis Sharif University of Technology ; Kazemeini, Mohammad (Supervisor) ; Mashayekhi, Maryam (Supervisor) ; Soltanali, Saeed (Co-Supervisor)
Abstract
To improve the hydrodesulfurization (HDS) performance of NiMo/Al2O3 catalysts, Y-zeolite additives were incorporated in either pristine form (at 10, 15 and 30 wt% in support) or as metal-modified materials prepared through a novel post-synthesis dealumination method using NH4HF2 and metal salts (i.e.; of Co, Mn, Zn, Zr, Sn(II), Sn(IV)). This approach aimed to increase mesoporosity, adjust the intrinsic acidity of the Y-zeolite, and weaken metal-support interactions to promote the formation of more active NiMoS-type species. Initial results showed that adding zeolite Y to the catalyst results in a significant decrease in liquid product yield, so that to create a suitable balance between...