采用原位红外和ＴＰＤ－ＩＴＤ研究了二异丙苯、异丙苯、苯和丙烯在Ｙ沸石催化剂上的吸附和脱附。二异丙苯与苯的烷基转移反应可能是按单分子反应ＳＮ１和双分子反应ＳＮ２－１及ＳＮ２－２机理进行；异丙苯和二异丙苯能够发生歧化反应及脱烷基反应；脱烷基反应产物丙烯之间能够发生齐聚反应；二异丙苯之间也能够发生异构化反应。催化剂失活的原因可能是，在Ｙ沸石催化剂的超笼内形成了分子直径较大的“非焦炭化合物”，这些化合物不能从孔口扩散出去而滞留在超笼内，阻止了反应物进入孔内的活性中心。 Adsorption and desorption of diisopropylbenzene, cumene, benzene and propylene on Y zeolite catalysts were investigated by in situ infrared and TPD-ITD. Alkylbenzene and benzene transalkylation reaction may be based on single-molecule reaction SN1 and bimolecular reactions SN2-1 and SN2-2 mechanism; cumene and diisopropyl benzene disproportionation reaction can occur and reaction; Alkene reaction products of dealkylation reaction can occur oligomerization; diisopropylbenzene can also occur between the isomerization reaction. The catalyst deactivation may be due to the formation of larger molecular diameter “non-coke compounds” in the supercages of Y zeolite catalysts that can not diffuse out of the orifices and remain in the supercages and prevent reactants from entering the pores Within the active center.