水热处理后FCC催化剂及Y型沸石的裂化活性及其物化性质表征

采用DTA、XRD、^27Al NMR和吡啶吸附-IR等方法，对水热处理后在不同条件下存放的两种FCC催化剂及相应的Y型沸石分别进行了物化性质表征。结果表明，经水热处理后在空气气氛下放置时，沸石易于吸附环境中的水分形成一定量的表面水，并将表面水进一步极化成以活性羟基形式存在的结构水，从而使总酸量提高；同时，在空气气氛中放置吸水后，沸石骨架中可能发生了晶格重排，部分非骨架铝转变为骨架铝，使晶胞常数略有增加。对水热处理后不同存放条件下FCC催化剂的裂化活性变化规律及其物化性质进行了关联。

THE CRACKING ACTIVITY AND PHYSIC-CHEMICAL CHARACTERIZATION OF FCC CATALYSTS AND Y ZEOLITES AFTER STEAM TREATED

DTA, XRD, 27 Al NMR and FT IR techniques were used to characterize two FCC catalysts and corresponding Y zeolites, which were placed in different conditions after steamed. It is shown that, the Y zeolite could adsorb moisture, which was further polarized to become the active hydroxyl if it was placed in the atmosphere after steamed, resulting in the increase of total acid amount. Crystal lattice rearrengement probably happened in the zeolite framework, in which a part of octahedral Al was converted into tetrahedral Al sites at room temperature, and the UCS of the zeolites will be slightly increased. The influences of treating conditions on the micro activity(MA) of steamed FCC catalysts were also discussed.