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以20～300K的低温正电子湮没寿命谱学方法研究了NaY沸石、USY沸石及多孔γ-Al2O3的表面结构.实验分别测量了脱水后三样品的低温正电子湮没寿命谱,其中NaY,USY用5个寿命分量分解,γ-Al2O3用4个寿命分量分解.实验结果表明,较短的寿命分量与测量温度无关,而最长的寿命分量(约40ns)则与测量温度有关,不同的寿命温度相关性表明NaY的表面结构与γ-Al2O3的不同.
The surface structures of NaY zeolites, USY zeolites and porous γ-Al2O3 were studied by positron annihilation lifetime spectroscopy at 20-300 K. The low temperature positron annihilation lifetime spectra of three samples after dehydration were measured, of which NaY and USY The five life components are decomposed and the γ-Al2O3 is decomposed by four life components.The experimental results show that the short life components are independent of the measurement temperature, while the longest life components (about 40ns) are related to the measurement temperature. Different lifetimes The correlation shows that the surface structure of NaY is different from that of γ-Al2O3.