Preparation Of Tungsten Catalysts And Its Applications In The Catalytic Oxidative Desulfurization, Etc

W-catalyst for hydrogenation,dehydrogenation,olefins hydration,dehydration, oxidation,alkylation,acylation,and many have good catalytic reaction,which became an oil refining,petrochemical and other industries application the major catalyst types,the research and application of bigger and bigger.In this work, tungsten resource with ample supply in China especially in Jiangxi province was used as catalysts.And we mainly carried out the following aspects of research works as follows:Phosphotungstic acid sodium(P₂W₁₈) with Dawson structure were synthesized under conventional hydrothermal conditions in acidic solution using H₂WO₄ and NaH₂PO₄.The P₂W₁₈ catalyst was characterized by means of IR. Tungsten-containing mesoporous molecular sieves WO₃-SBA-15 were synthesized under conventional hydrothermal conditions in strong acidic solution using H₂WO₄ as tungsten source,tetraethylorthorthosilicate as silicon source,and the mixture of P123 and cetyltrimethylammonium briomide as structure directing agent.The catalyst was applied in the catalytic oxidative desulfurization and characterized by means of XRD and N₂ adsorption.The catalyst was applied in the catalytic oxidative desulfurization.An environmentally benign and green process is highly desirable in the development of catalysis.One of the most important fields is to rebuild the conventional processes of petrochemical production,which measurably contribute to pollution.Deep desulfurization of fuel oil is receiving wide attention in the research community worldwide due to increasingly stringent regulations and fuel specifications in many countries for environmental protection purpose.The oxidative desulfurization(ODS) is considered to be an efficient and promising method.We were selected WO₃-SBA-15,P₂W₁₈ as the catalyst,promotor and extracant as well as the operation condition of oxidation desulfurization i.e,the amount and recovered way of catalyst,promotor,oxidant and extractant,temperature and time of oxidation and phase separation,are carried on optimmum in this paper.Under the best condition of operating,desulphurization rate of refined diesel oil and yield are determined strictly,and different sulfur content of fuel oil for adaptive research.At the same time,the green catalytic synthesis process may be the catalyst activity and structure of the reaction mechanism of a preliminary study and exploration.The results show that the tungsten oxide catalyst for the desulfurization system has higher catalytic activity.The technology has a low-oxidant,a catalyst to facilitate recycling,renewable sources of easy-to-extractant advantages.Under the optimal reaction conditions as follows:20 mL model fuel with 500 mg/L sulfur,0.030g P₂W₁₈,1.2 mL C₂H₅OH,0.12 mL 30%(w) hydrogen peroxide solution,reaction temperature 310 K,reaction time 60 min and three times extraction (V_(DMF):V(oil)=1),desulfurization rate is 96.7%.20mL gasoline with sulfur concentration of 540ppm,0.040g Tungsten-containing mesoporous molecular sieves WO₃-SBA-15 catalyst,H₂O₂/sulfur molar of 6,reaction temperature 333k,reaction time 80min and then three times extraction.