In order to improve the catalytic performance of HZSM-5 zeolite in the coupling conversion of methanol and butylene to propylene,B-HZSM-5 catalyst containing heteroatomic boron was prepared by hydrothermal synthesis method.The reactivity and regeneration performance of B-HZSM-5 catalyst in the coupling conversion of methanol and butene to propylene were investigated.The fresh and regenerated catalysts was characterized by XRD,SEM,N2 isothermal adsorption-desorption,NH3-TPD and Py-IR.The coke deposited on the used catalysts was characterized by TG and XPS.The results show that B-HZSM-5 catalyst shows higher propylene yield,better stability and carbon resistance than HZSM-5.Compared with HZSM-5,the specific surface area and pore volume of B-HZSM-5 increase,the amount of weak and medium acid sites increases,the strong acid sites amount decreases,the ratio of B acid sites to L acid sites decreases.With the increase of regeneration times,both the specific surface area and pore volume of B-HZSM-5 catalyst decrease,the amount and strength of acid sites decrease,the reactivity of the catalyst decreases,whereas the stability is improved.
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