Study on Spent Lubricating Oil from Catalytic Cracking of Al/SO4^2-/AL-MCM-41 Molecular Sieve

The waste lubricating oil will cause great harm to the natural environment if it is discarded randomly or handled improperly. Catalytic cracking is the main technology for regenerating waste lubricating oil into fuel oil. The molecular sieve Al/SO4^2-/Al-MCM-41 was prepared by introducing metal Al atoms into the molecular skeleton of MCM-41 and then modifying it with Al₂(SO4)₃. The samples in the preparation process were characterized and analyzed by TG, FTIR, XRD, N2 adsorption desorption and other test techniques. The effects of reaction temperature and the amount of catalyst on catalytic cracking of used lubricating oil were studied. The results show that: The existence of large pores in the catalyst is conducive to the entry of waste lubricating oil molecules into the pores, so that the surface active sites of the catalyst can be fully utilized. When the silicon aluminum ratio is 1:0.02 and the calcination temperature is 600 °C, the catalyst has the highest activity. When the reaction temperature is 400°C, the reaction pressure is 0.01 MPa, the stirring speed is 200 rpm, and the amount of catalyst is 2.8 g. The yield of gas product is 1.11%, the yield of liquid product is 87.02%.