论文部分内容阅读
本文制备了一系列不同硅铝比的Y型沸石样品,以红外光谱法系统地研究了样品的羟基谱带及其变化情况。结果表明,Y型沸石羟基谱带随沸石体系组成的变化及晶格空位和骨架外铝的出现而发生一系列的变化,样品表面羟基振动频率受骨架内电负性和骨架外电荷变化的影响会产生规律性的位移,进一步还讨论了其作用的机理,另外讨论和归属了Y型沸石常出现的几种羟基红外吸收谱带。
In this paper, a series of Y zeolite samples with different Si / Al ratios were prepared. The hydroxyl bands of the samples and their changes were systematically investigated by infrared spectroscopy. The results showed that the hydroxyl band of Y zeolite changed with the composition of zeolite system and the vacancy of crystal lattice and the appearance of extra-framework aluminum. The frequency of hydroxyl vibration on the sample surface was affected by the electronegativity in the framework and the charge outside the framework Will produce a regular displacement, further discussed its mechanism of action, in addition to discuss and attributed to the Y-type zeolite several hydroxyl infrared absorption bands often appear.