SELECTIVITY OF METAL, ADSORBENT, OXIDE, HETEROPOLYACID CATALYSTS FOR S-HETEROCYCLES DURING NON-HYDRODESULFURIZATION OF DIESEL FUEL

An analysis on various catalysts was performed to determine their activities and selectivity for the non-Hydrodesulphurization (Non-HDS) technique using diesel fuel. Catalysts studied included well characterizedSilica-Alumina on Al2O3 and Activated Carbon supports, salt-acid supports, Organic Mesoporous Carbon,Woodcoat carbides, Mg/Mo/Zn oxide supported catalysts which were prepared by various reactions.The diesel fuel consists of 2-3.5 wt% of sulfur compounds (thiophene and dibenzothiophene) withapproximate amounts of aliphatic, alkylaromatics and N-heterocyclic compounds. With oxygen as theoxidant and some metal oxides and adsorbents type catalyst are used in the oxidation-Adsorption reactionprocess reveals that the metal induced and adsorbent-oxide induced catalyst shows the best selectivityfor oxidizing the S-heterocycles. Except for thiophene, there was only a small dependence of observedrates on catalyst ratio, temperature which suggests the reactions were partially diffusion controlled.The optimal catalyst (MoSil, Si-Al/Mo/Al2O3, and CsHPW-SiO2) showed high activity for conversion of Sheterocycles.This work includes further investigation of the better catalysts, full characterization of theproducts by GC-MS, ICP-AES to provide a hydrodynamic environment.