Reed Leaves Template Cobalt Doping Material And Co - The Preparation And Catalytic Oxidation Ouni Mcm - 41

Carvone is one of the main component of plant essential oils, which is widely used in food industry, in particular, is for toothpaste, chewing gum, beverages, flavors, it is also an important intermediate in the synthesis of oxygenated derivatives of limonene.Therefore, its synthesis is an important organic chemical reaction.The industrial synthesis of carvone exists some defects such as corrosive equipment and serious pollution.Recently there are many reports on the synthesis of carvone used new materials as catalysts,such as metal salts and metal complexes loaded mesoporous materials.Most research are focused on the noble metal and Variable divalent metal compelxes which were supported by the mesoporous materials.The synthesis of mesopurous materials using templates has been playing an important role in the development of mesopurous materials.Recently,bio-templates have attracted considerable attention for the syntheses of porous inorganic materials, because they are generally inexpensive, abundant, environmentally benign, moreover, they can provide a novel strategy.Yunnan is very rich in plant resources,in this article,we select the wetland plant reed as the object of the study and choose its leaves as the bio-template.With bio-templates such as reed leaves,silica source such as TEOS, transition metal cobalt doped silica-based mesoporous materials(Co-SiO2) were synthesized by different methods.A series of transition metal cobalt doped silica-based mesoporous materials were obtained by adjusting the preparation process,the conditions of the calcination treatment of the material,the calcination temperature of the materials,the amounts of the transition metal.The samples were characterized by a combination of various physicochemical techniques, such as N2physisorption,,scanning electron microscopy (SEM) and X-ray fluorescencediffuse reflectance(XRF).For the first time,we use the obtained Co-SiO2as catalysts for the liquid phase oxidation of limonene under mild conditions.In order to obtain the optimum reaction conditions,the effects of some parameters were investigated,such as the kinds of the catalysts and oxidants,the amounts and types of the solvent,the reaction time and temperature,the calcination temperature of the catalysts,the doped amounts of the transition metal.After the reaction,the mixture was detected by capillary column Gas chromatograph(GC).And,of course,we had also investigated the life span of the catalysts. According to the experiments data,under the optimum reaction conditions,the conversion of limonene was100%,the selectivity of carvone was40%,the yeild of carvone was achieved at40%.The synthesis of Co-MCM-41was conducted by a process,then,using it as the catalyst of the oxidation of limonene.Under the optimum conditions,the conversion of limonene was48.5%,the selectivity of carvone was54.5%.