Study On The Different Element Modified ZSM-5 Zeolite And Its Application To The MTP Reaction

The current researching of methanol to propylene at home and abroad was reviewed. The reaction of methane conversion over the ZSM-5 zeolite catalyst with different ion exchange was studied. The optimum catalyst was selected and the effect of process conditions on the reaction catalyzed by Mg-ZSM-5 and Ce-ZSM-5 was discussed. Thermodynamic analysis on the reaction system was carried out. The catalytic mechanism of methanol conversion by ZSM-5 was deduced based upon the literature and experiment.In the part of catalyst's selection, the ratio of SiO₂/Al₂O₃, the phosphor magnesium modified ZSM-5, the lanthanum modified ZSM-5 were investigated. Mg-ZSM-5 and Ce-ZSM-5 were the most ideal catalyst for methanol-to- propylene reaction.In the part of optimizing process conditions, the influence of reaction temperature, space velocity and composition of stuff on catalytic reaction were investigated respectively. For the reaction by Mg-HZSM-5, the reaction conditions recommended are as follows: reaction temperature 380-400°C, space velocity 5h^-1, amount of MgO 1%. Under the optimum process conditions the convention of CH₃OH exceeds 95%, the yield of C₃H₆ is 42.48% and the petrol is a bit. For the reaction by Ce-HZSM-5, the reaction conditions recommended are as follows: reaction temperature 380°C, space velocity 5h^-1. Under the optimum process conditions the convention of CH3OH is 100%, the yield of C₃H₆ is 55% and the petrol is little.In the thermodynamic analysis on the reaction system, the possible reaction of the "methanol-to- propylene" system was calculated and several conclusionswere drawn.It was validated that ethylene is the origination olefin of methanol to propylene by experiments.