Synthesis Of Molybdenum Catalysts And Their Catalysis Research Of Epoxidation Of Carbon-carbon Double Bond

The plasticizer storm events have drawn more and more attention on the safety oftraditional phthalate plasticizers, epoxy vegetable oil base plasticizers have attracted muchattention due to its source of renewable and low toxicity. Traditionally, epoxidation processeshave hazards associated with handling the peracids and does not meet the trend of clean andlow-carbon production. The purpose of this paper is in the absence of carboxylic acidenvironment, research on the catalytic activity of molybdenum(VI) catalysts in the long chainof carbon-carbon double bond epoxidation reaction, exploring of new catalytic system.Fristly, three molybdenum(VI) complexes were synthesized: MoO2(acac)2,MoO2(SAP)(EtOH) and MoO2(SAE)(EtOH), which can be proved by comprehensive analysis,such as, FT-IR, UV-Vis, EA, TG-DTG,1H-NMR, and other characterization methods.Secondly, the three kinds of molybdenum(VI) complexes above were used as catalysts inthe epoxidation of soybean oil(SBO), the performance of catalysts in the epoxidation ofvegetable oil was investigated. By comparison, chose the schiff base molybdenum(VI)complexe MoO2(SAP)(EtOH) which has the better catalytic performance as the researchobject, the catalytic properties of catalyst in the synthesis of epoxidized soybean oil(ESO) wasstudied. The effects of reaction temperature, reaction time, types of oxidants, dosage ofoxidants, solvent and additives on the epoxidation of SBO were discussed in detail. Theresults show that, the conversion and selectivity of ESO reach43.0%and67.2%respectivelyat80℃for4h, with tert-butyl hydroperoxide(65%TBHP) as oxidant. Meanwhile, the yieldof ESO was related to the nature of additives, which was reduced dramatically by addingstrong coordinating additives such as imidazole, DMSO, DMF. The mechanism of interactionbetween the catalyst and oxidant was finally investigated according to the experimentphenomenon and test results and then verified preliminarily by thermogravimetric analysis.Finally, the exploration of homogeneous molybdenum(VI) catalysts heterogenizationwas carried on. Merrifield Resin and Aminomethyl Resin were selected in this paper ascatalyst carriers, three types of supported polymer catalysts were designed and synthesized byligand grafting method, which were characterized by comprehensive analysis, such as,ATR-FTIR, TG-DTG, EA, SEM, BET, EDS. At the same time, according to thecharacterization results, the possible structure of the catalysts were presented. The synthetizedthree kinds of supported polymer were as catalysts in the epoxidation of cyclohexene togenerate epoxy cyclohexane for the first time, the catalytic activity and recycle of catalyts inshort chain alkenes were studied. It turned out that, the synthetized three kinds of supportedpolymer catalysts have excellent catalytic activity and selectivity, and can be reused. This’s akind of polymer catalysts with industrial application prospects in olefin epoxidation, whichwill provide ideas in the catalytic epoxidation of long chain carbon-carbon double bond.