Preparation Of Schiff-base Molybdenum(?) Complexes And Investigation Of Catalytic Performance For Epoxidation

Epoxidized soybean oil, which is a type of non-toxic, high performance plasticizers and stabilizers, have been allowed to replace phthalic acid esters as plasticizers using in food and medicalmaterial packaging and toys production internationally. It has a broad development prospects. In this paper, pyridine schiff-base molybdenum complexes and o-aminophenol schiff-base molybdenum complexes were prepared as catalyst to apply in epoxidation of soybean oil when tert-butyl hydroperoxide(TBHP) was used as an oxidizer. Meanwhile, catalytic capacity of the pyridine schiff-base molybdenum complexes was studied in epoxidation of cyclohexene. The thesis mainly includes the following four chapters: Chapter 1: ReviewsIntroduced plasticizers and the kind of plasticizers derived from epoxy plant oil, make an overview of the progress of novel catalysts used in epoxidized plant oil. Furthermore, make an overview of the application of Schiff base complexes in the olefin epoxidation reactions. Chapter 2: Preparation of 2-[(pyridin-2-ylmethylidene)amino]phenol Schiffbase Mo Complex and the Catalytic Performance for Olefins EpoxidationThe Schiff-base Molybdenum(VI) Complex [MoO2(L1)(EtOH)](HL1= 2-[(pyridin-2-ylmethylidene)amino]phenol), was synthesized by one-pot reaction. The complex was characterized by FT-IR, TG, XPS, EA, ICP and SEM. The complex has catalytic activity for epoxidation of soybean oil and cyclohexene by tert-butyl hydroperoxide as oxidizing agent. The influencing factors of reaction were studied such as the reaction temperature, reaction time, mass of catalyst, substrate and oxidant molar ratio. At optimum condition, the conversion of soybean oil is 69.7 %, and the selectivity of epoxidized soybean oil is 62.9 %; the conversion of cyclohexene is 77.2 %, and the selectivity of 1,2-Epoxycyclohexane > 99 %. Chapter 3: Preparation of 2-[[(2-pyridinylmethyl)imino]methyl]phenol Schiffbase Mo Complex and the Catalytic Performance for Olefins EpoxidationThe Schiff-base Molybdenum(VI) Complex [MoO2(L2)(EtOH)](HL2=2-[[(2-pyridinylmethyl)imino]methyl]phenol, was synthesized by one-pot reaction. The complex was characterized by FT-IR, TG, XPS, EA and ICP. The complex has catalytic activity for epoxidation of soybean oil and cyclohexene by tert-butyl hydroperoxide as oxidizing agent. The influencing factors of reaction were studied such as the reaction temperature, reaction time, mass of catalyst, substrate and oxidant molar ratio. At optimum condition, a 65.2 % conversion of soybean oil was obtained, with the epoxy selectivity of 71.8 %; a 72.7 % conversion of cyclohexene was obtained, with the epoxy selectivity of 96.3 %. Chapter 4: Preparation of 2-Hydroxyacetophenone-2-Aminophenol Schiff- base Mo Complex and the Catalytic Performance for Olefins EpoxidationThe Schiff-base Molybdenum(VI) Complex [MoO2(L3)(EtOH)](H2L3=2-Hydroxyacetophenone-2-Aminophenol, was synthesized by one-pot reaction. The complex was characterized by FT-IR, TG, XPS, ICP and SEM. The complex has catalytic activity for epoxidation of soybean oil by tert-butyl hydroperoxide as oxidizing agent. The effect of some factors, such as the reaction temperature, reaction time, mass of catalyst, soybean oil and oxidant molar ratio, was investigated. Under the optimum condition, the conversion of soybean oil is 50.1 %, and the epoxide selectivity is 73.7 %.