Studies On Catalyst And Reaction Of Alkylation Of Benzene With Propane

Propane is an abundant and inexpensive hydrocarbon which is difficult to be industrially utilized due to its stable structure and uneasiness to be activated. Production of alkyl aromatics from propane by alkylation with benzene is a new route to utilize propane proposed recently, which is highly meaningful in scientific and industrial sense. This thesis studied alkylation of benzene with propane over metal-loaded zeolites.Mo/HZSM-5 is applied to alkylation of benzene with propane for the first time. Though conversion of propane was low, but the content of i-propylbenzene and n- propylbenzene could reach 81.5%(mol). The role of acid strength of HZSM-5 was researched by means of partial ammonia poisoning. The results showed that alkylation of benzene with propane occurred through bifunctional mechanism. The active and highly selective bifunctional active centers are formed by strong interaction between Mo at +4 valence and strong acid sites of HZSM-5. A possible reaction mechanism over Mo/HZSM-5 is proposed.Catalytic performance in alkylation of benzene with propane over Cr₂O₃/Al₂O₃, Pt/Al₂O₃, Pt-Sn/Al₂O₃, HZSM-5 mechanically blended with these dehydrogenation catalysts, and supported Pt/HZSM-5 showed that some interaction doing favor to the alkylation exists between the dehydrogenation catalysts and the acidic catalyst.Pt supported on acidic zeolites especially HZSM-5 catalyzes alkylation of benzene with propane effectively. Effects of Pt loading amount, SiO2/Al₂O₃ of HZSM-5, reaction atmosphere, and reaction conditions on catalytic performance of Pt/HZSM-5 were researched. Addition of P, Mg Mo Sn Zn to Pt/HZSM-5 can effect catalytic performance.