Resource Utilization of MTO Spent Catalysts to Prepare Type A Molecular Sieve
QI Shengdong, SUN Xiaoxue, WANG Deju, LIU Li
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, SINOPEC, China
Abstract：Methanol to olefins (MTO) spent catalysts were pretreated with the nitric acid solution. By adjusting the ratio of solid to liquid, nitric acid concentration and leaching temperature, the molar ratio of Si to Al (Si/Al) of leaching slag was about 1, and the leaching rate of phosphorus was greater than 90%. The preparation of zeolite A using slag as raw materials was systematically studied. The results showed that the slag could be successfully converted into zeolite A through alkali fusion-hydrothermal crystallization under conditions of 60% dosage of NaOH in slag, alkali-activated at 450 ℃ for 3 h followed crystallization for 24 h at 80 ℃ with the water-slag ratio of 5. The static water adsorption rate of the prepared zeolite A was more than 24%, which reached the first-class of 4A molecular sieve activated powder.
QI Shengdong,SUN Xiaoxue,WANG Deju et al. Resource Utilization of MTO Spent Catalysts to Prepare Type A Molecular Sieve[J]. Chemical Reaction Engineering and Technology, 2022, 38(6): 509-514.
