Y型沸石的铝化及其性能研究

PREPERATION AND PROPERTIES OF ALUMINATED Y ZEOLITE

用(NH_4)_3AlF_6溶液对Y型沸石进行铝化,得到了不同硅铝比的铝化Y型沸石。XRD实验表明Al原子进入Y型沸石骨架,晶胞常数α_0增大,而且晶胞常数α_0的增大与铝化程度有一定的关系。铝化Y型沸石的吸附量略有降低。IR研究表明,骨架振动,表面羟基谱峰变化不明显。在铝化Y型沸石上存在B酸和L酸,其主要是B酸中心。

The different Si/Al ratios of Y zeolites aluminated with (NH4)3A1F6 were obtained. Aluminium inserted in the framework was varified by XRD. The unit cell parameter a0 was increased and the amount of adsorption was decreased with the increasing of alumination. Pyridine adsorption IR spectra showed that both Bronsted and Lewis acid sites present on the surface of aluminated Y zeolites, but mainly were Bronsted acid sites. IR spectra also showed that the wavenumber of framework vibration and the intensity of surface hydroxyl groups bands were slightly changed.