Influence of temperature on the OH-band intensity in the infrared spectra of decationated zeolites X and Y
Influence of temperature on the OH-band intensity in the infrared spectra of decationated zeolites X and Y
复制标题
温度对去离子沸石 X 和 Y 红外光谱中 OH 带强度的影响
DOI：
10.1016/0021-9517(70)90296-4
复制
发表时间：
1970
影响因子：
7.3
通讯作者：
J. Uytterhoeven
中科院分区：
文献类型：
--
作者：
R. Schoonheydt;J. Uytterhoeven
研究了几种脱阳离子沸石X和Y在OH伸缩区的红外光谱，并考察了温度对3650和3550 cm-1附近谱带强度的影响。沸石衍生自初始用Li+、Na+、K+和Mg 2+离子饱和的样品（在Y样品的情况下）和用Na+离子饱和的样品（在X样品的情况下）。有些样品中残留的Na+离子含量不同。在3650 cm− 1附近的谱带的确切频率更多地取决于残留阳离子的数量，而不是其性质。在400 °C以下，随着温度的升高，OH谱带强度可逆地降低（20-30%），并向低频方向移动，谱带变宽。所有这些效应都归因于晶格组分的热运动的增加。3550和3650谱带的强度比也依赖于温度。这是通过假设质子在不同位点上的重新分布来解释的。这种效应取决于残余离子的量和室温下谱带强度比的初始值。
The IR spectra of several decationated zeolites X and Y were studied in the OH stretching region, and the influence of temperature on the intensity of the bands near 3650 and 3550 cm−1was investigated. The zeolites were derived from samples initially saturated with Li+, Na+, K+, and Mg2+ions, in case of the Y samples and with Na+ions in case of the X samples. Some samples had different contents of residual Na+ions. The exact frequency of the band near 3650 cm−1was dependent on the amount more than on the nature of the residual cations. The frequency of the OH bands was interpreted in terms of the electrical field in the zeolite cavities.A reversible decrease of the band intensity (20–30%) was observed with increasing temperature below 400 °C together with a small shift to lower frequencies and a broadening of the bands. All these effects are ascribed to the increased thermal motion of the lattice constituents. The ratio of the intensities of the 3550 and 3650 bands was also dependent on the temperature. This was explained by assuming a redistribution of the protons over the different sites. The effect was dependent on the amount of residual ions and the initial value of the band intensity ratio at room temperature.