Study On The Preparation Of Cu-γ-Al₂O₃@P（St-DVB） Bifunctional Catalytic Materials

Dimethyl ether （DME） can be used as a kind of clean energy.It burns more sufficient anddoesn’t generate gas pollution comparing with fossil fuel,such as coal and oil.China is acoal-riched,gas-lacked and oil-lacked country. The distribution of coal is very wide and thereserves of coal is the most in fossil fuel, but85%of coal is wasted by burning directly.According to our country’s energy situation, if dimethyl ether synthesized by coal-basedsyngas replace the traditional fossil energy,it will be of great significance in making the fulluse of coal resources of our country in a clean way and alleviating the problem of energycrisis and environment pollution. Therefore, people have made a lot of research in dimethylether recently.At present, the research has focused on dimethyl ether synthesis catalysts and itscatalytic properties. The content of this study is to build a micro, independent, orderly andsystematic catalytic reaction space system that is used as a model in the design andpreparation of the catalyst.The first chapter introduces the background and significance of dimethyl ether synthesis, thesynthesis methods of dimethyl ether and the research progress of catalysts. The secondchapter describes the preparation of nano-copper by liquid-phase reduction method underdifferent conditions. The results showed that nano-copper could be prepared under theconditions of different reaction temperatures and different concentration of stabilizer. Thethird chapter describes the preparation of nano-γ-Al₂O₃by sol-gel method. When thecalcining temperature is lower than700°C, γ-Al₂O₃couldn’t be synthesized. When thecalcining temperature is700°C or above, γ-Al₂O₃began to phase, and degree ofcrystallization increases with the increasing of calcining temperature. When the calciningtemperature is900°C, the characteristic peak of α-Al₂O₃appears in the X-Ray diffraction chartof γ-Al₂O₃,and γ-Al₂O₃began converse to α-Al₂O₃; The sizeγ-Al₂O₃is small and thedistribution particle size is uniform when synthesized by using PEG400as template agent.Tothe contrary, the size of theγ-Al₂O₃synthesized without PEG400is much bigger and thedistribution of particle size is very wide. The fourth chapter study mainly on the preparationof Cu-γ-Al₂O₃@PS@P（St-DVB） microspheres. Nano-copper particles and nano-γ-Al₂O₃particles modified with silane coupling agent have good compatibility with a styrenemonomer, and Cu-γ-Al₂O₃@PS composite microspheres between300-500nm wereprepared by soap-free emulsion polymerization. And then Cu-γ-Al₂O₃@PS@P（St-DVB）microspheres were prepared by seeded emulsion polymerization method usingCu-γ-Al₂O₃@PS composite microspheres as seeds. The size of Cu-γ-Al₂O₃@PS@P（St-DVB） microspheres is bigger than Cu-γ-Al₂O₃@PS composite microspheres, and the surface ofCu-γ-Al₂O₃@PS@P（St-DVB） microspheres becomes rough,it is because the cross-linkingcopolymerization of St and DVB in the surface of the Cu-γ-Al₂O₃@PS compositemicrospheres.