Study On Preparation Of Supported Transition Metal Oxide Supported Catalysts And Its Oxidative Desulfurization Performance

SO_xgenerated from the combustion of sulfides in oils can cause air pollution.With environmental issues are payed more attention by people,various indicators in oil products are also severely restricted.In the national five standards,it is clearly regulated that the sulfur content should be controlled within 10 ppm.Therefore,deep desulfurization of oil products is imperative.At present,the common hydrodesulfurization technology has the problems of harsh operating conditions,poor removal of thiophene sulfides,and so on.In recent years,oxidative desulfurization technology has attracted much attention due to its advantages of mild reaction conditions,high desulfurization rate,and no consumption of hydrogen.In this paper,three supported transition metal oxide catalysts were prepared and the oxidative removal of sulfide was studied.?1?V₂O₅/g-C₃N₄ catalyst was synthesized by high temperature calcining using ammonium metavanadate,melamine and boric acid as raw materials.The catalyst was characterized by FT-IR,XRD,XPS,SEM and BET.The removal of Sulfide in model oil was studied with V₂O₅/g-C₃N₄ as catalyst,acetonitrile as extractant and H₂O₂ as oxidant.When the simulated oil was 5m L,the amount of acetonitrile was 3 m L,the temperature was 30?,the n?H₂O₂?/n?DBT?was 8,the amount of V₂O₅/g-C₃N₄ was 0.02 g,and the time was 60 min,the experimental results show that the removal rate of DBT can reach 91.9%,and it can still reach 85.7% after 5 cycles.?2?C₆H₁₁NO-Zr OCl₂·8?H₂O?deep eutectic solvent was synthesized using caprolactam and Zirconium oxychloride octahydrate as raw materials.The deep eutectic solvents with different quality were dissolved in a mixture of tetraethyl orthosilicate and absolute ethanol to form a gel under acidic conditions.The n%-ZrO₂/SiO₂?n=2,4,6?composite material was prepared by drying and calcining.The synthetic samples were characterized by XRD,FT-IR,XPS,SEM and BET.The effects of loading dose of ZrO₂,reaction temperature,oxygen to sulfur ratio,amout of 4-%-ZrO₂/SiO₂ and different sulfides on the desulfurization effect were investigated.When the simulated oil was 5 m L,the loading dose of ZrO₂ was 4%,the temperature was 70?,the n?H₂O₂?/n?DBT?was 4,and the amount of 4%-ZrO₂/SiO₂was 0.2 g,the removal rates of DBT and 4-6-DMDBT in the simulated oil are 98.7%and93.0%,respectively.?3?The n%-SnO₂/SiO₂?n=2,4,6?composite material was prepared using tetraethylorthosilicate,urea,stannous chloride dehydrate as raw materials.The samples were characterized by FT-IR?XRD?XPS?SEM and BET.The effects of loading dose of SnO₂,reaction temperature,oxygen to sulfur ratio,amout of 4-%-SnO₂/SiO₂ and different sulfides on the desulfurization effect were investigated,respectively.The removal rates of DBT and 4,6-DMDBT are 99.5% and 81.6%,respectively under the simulated oil was 5 m L,the loading dose of ZrO₂ was 4%,the temperature was 70?,the n?H₂O₂?/n?DBT?was 6,and the amount of 4%-SnO₂/SiO₂ was 0.2 g.4%-SnO₂/SiO₂ has good stability,and the desulfurization rate is slightly reduced after 5 cycles.