Designation Of Novel Polyoxometalate Catalysts And Catalytic Oxidative Starch With Hydrogen Peroxide

In recent years,there is a growing concern on global warming and the reduce of fossil fuel.As a result,scientists spare no effort to study a more green,effective and long-term way,which refers to an approach that produces chemicals and fuel by using renewable row materials.Biomass resource,one of renewable resources widely existing in nature,which have drawn much attention of scientists both home and abroad.Starch is a green renewable and abundant biomass resource.Different varieties of starches could be produced after scientists change them in different technique ways.Oxidized starch is a kind of modified starch produced by partial oxidation of starch,which is widely used in daily life and industries.Among so many production methods,the method which regards hydrogen peroxide as oxidant is the most common one.In recent years,the polymetallic oxygen sour salt?POMs?is widely applied in chemical field because of its unique chemical catalytic and pollution-free characteristics.POMs has a strong oxidation and strong Br?nsted acid,which plays an important role in the field of biomass conversion.On the basis of previous research,this paper focuses on the following aspects.The specific research contents are as follows:1.The catalyst H₅PMo₁₀V₂/MCM-41 was prepared and it composition and structure was characterized by using ICP-AES,FT-IR,XRD,UV-VIS,nitrogen adsorption-desorption isotherm,TEM.The catalytic hydrogen peroxide oxidation starch has carried on the system research.And through the optimization to determine the optimal reaction conditions.The best reaction conditons were: temperature,80?C;2 mL of distilled water;oxidant amount 4 mL;reaction time,8 h;and catalyst amount,5 mg.Under the condition of the reaction degree of oxidation is up to 0.58 mol CO2 H per 100 g.the catalytic activity and effect of catalys is more ideal,catalyst can be reused after a simple processing.2.The catalyst H₅PMo₁₀V₂/SBA-15 was prepared and it Composition and structure was characterized by using using ICP-AES,FT-IR,XRD,UV-VIS,nitrogen adsorption-desorption isotherm,TEM.The catalytic hydrogen peroxide oxidation starch has carried on the system research.And through the optimization to determine the optimal reaction conditions.The best reaction conditons were: temperature,80?C;1.5 mL of distilled water;oxidant amount 4 mL;reaction time,9 h;and catalyst amount,5 mg.Under the condition of the reaction degree of oxidation is up to 0.59 mol CO2 H per 100 g.the catalytic activity and effect of catalys is more ideal,catalyst can be reused after a simple processing.3.A supramolecular compounds(?H₃O?₂?HINA?₂ [PMo₁₁VO₄₀].15.5H₂O)was prepared.The structure was determined by single crystal X-ray structure analysis.And it composition and structure was characterized by using FT-IR,UV-VIS and TGA.The catalytic hydrogen peroxide oxidation starch has carried on the system research.And through the optimization todetermine the optimal reaction conditions.The best reaction conditons were: temperature,70?C;2.0 m L of distilled water;oxidant amount 4 mL;reaction time,7 h;And catalyst amount,4 mg.Under the condition of the reaction degree of oxidation is up to 0.60 mol CO2 H per 100 g.the catalytic activity and effect of catalys is very ideal.