The Oxidative Desulfurization Of Dibenzothiophene Catalyzed By Iron-phthalocyanine

Along with the more and more strict demand on environment protection, there is anurgent need to produce low sulfur fuel oil to meet the future environmental legislation on thesulfur content. The oxidative desulfurization (ODS) is considered to be one of the newpromising methods for super deep desulfurization. Because there are some advantages ofODS mild reaction condition, economy, and especially can remove dibenzothiophenes whichare hard to remove in hydrodesulfurization (HDS). However, it is difficult to meet needswhich include economy and environment.In this background, we used dibenzothiophene (DBT) as a model compound to researchits oxidation desulfurization. We selected 4 kinds of substituents iron-phthalocyanine ascatalytic systems compared with other oxidative system and achieve a better conclusion.On the basis of traditional synthesis of phthalocyanine, we used diesel oil instead ofnitrobenzene as solvent. Through investigating effects of reaction temperature, reaction time,amount of catalyst and added time of material on yield of FeTSPc, we got the optimalreaction conditions. The yield of FeTSPc was improved from 68％to 81％. The structure ofFeTSPc was affirmed by IR, UV-VIS spectrum.1％DBT as model compound, we used 4 kinds of catalysts which include FeTSPc,FeTNPc, FeTAPc and FeMATNPc on DBT oxidation desulfurization. Some factors ofreaction tempareture, reaction time, the mole ratio of O/S and amount of catalyst wereconducted on conversions of DBT. Upon optimal conditions, their catalytic abilityconsequence was as follows: FeTNPc＞FeMATNPc＞FeTAPc＞FeTSPc, and theconversions of DBT reached 96.52％, 93.7％, 91.92％, 35.5％, respectively. We proposed amechanism of oxidation of DBT catalyzed by iron-phthalocyanines.Different from above system, an oil-soluble oxidative system was conducting usingCYHPO catalyzed by FeTNPc. The factors of reaction tempareture, catalyzed amount, theratio of O/S, reaction time were investigated in detail. The results compared withnon-catalyzed oxidation. We concluded that oxidation of DBT catalyzed by FeTNPc did notachieve complete conversions of DBT, but also shortened the reaction time. The catalyst ofFeTNPc was employed 10 times repeatly, and its catalytic activity was not changed.