The Preparation And Structure Of Spherical ?-Al₂O₃ Support Catalysts And The Study Of Their Catalytic Performance

With the development of society, human society on fossil energy demand is more and more,but the fossil energy is non renewable energy, also in fossil energy consumption process will produce large amounts of CO2, it will lead to global greenhouse effect.So searching for new green and renewable energy has become a hot research topic.CO2 and H2O through photosynthesis to produce cellulose, nature will produce large amounts of cellulose every year, at same time it can be hydrolysis into glucose, and glucose can be further hydrogenated to many chemical materials, so people think cellulose as a second generation of biomass fuels become research focus.Synthesis of Mn-Fe-Al mixed metal oxide catalyst, using urea precipitation method synthetise Mn-Fe-Al mixed metal deposit on surface of spherical ?-Al2O3 through calcined it become mixed metal oxide catalyst. Using XRD, BET, XPS and NH3-TPD to study the structure and surface chemical state of catalyst, at same time study the optimum reaction conditions of the catalyst. During the reaction, Mn provides Lewis acid sites, which promotes the hydrolysis of cellulose. The catalyst at 240?,4 hours to show the best catalytic effect, the yield of glucose was 48.1%. At the same time, after using the catalyst was reused 5 times, the structure and catalytic properties of the catalysts and no obvious changes.Synthesis of Ni/?-Al2O3 catalyst, using urea method synthetise Ni-Al LDH on surface of spherical ?-Al2O3 through calcined and reduction it become Ni/y-Al2O3 catalyst. Using XRD,BET,XPS,H2-TPR,SEM,TEM and CO2-TPD to study the structure and surface chemical state of catalyst, at same time study the optimum reaction conditions of the catalyst. In the catalytic process, surface basic sites and active center through synergistic effect to promote glucose hydrogenation.. The catalyst at 130?,1 hours and 2 MPa of H2 to show the best catalytic effect, the conversion of glucose was 92.0%,the selectivity of sorbitol was 98.8%. At the same time, after using the catalyst was reused 5 times, the structure and catalytic properties of the catalysts and no obvious changes.