A solid acid catalyst aluminum sulfate was prepared and showed good performance for the propylene oxide rearrangement reaction. The selective adsorption of propylene oxide at different acid sites and the amount of acid sites on the catalyst was studied by the pyridine infrared. The results indicated that the rearrangement of propylene oxide on aluminum sulfate is catalyzed by Lewis acid sites. The rearrangement behavior of propylene oxide on the Lewis acid sites was then studied by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and a mechanism was proposed. Fourier transform infrared spectroscopy results showed that the catalyst deactivation is mainly due to the decrease of active sites caused by the coverage of coke, so the coke decomposition was studied in order to regenerate the catalyst. The coke decomposition at different temperatures and atmospheres was studied by thermogravimetry–derivative thermogravimetry and in situ DRIFTS, and the results showed that some of the coke on the catalyst is hydrocarbon such as alkanes and olefins that decomposes at lower temperature and the other is aged coke or the graphite‐like carbon that decomposes at higher temperature, and the higher the oxygen content and temperature, the easier to remove the coke.

中文翻译：

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硫酸铝上的活性位和焦炭用于环氧丙烷的重排

制备了固体酸催化剂硫酸铝，并显示出良好的环氧丙烷重排反应性能。通过吡啶红外光谱研究了环氧丙烷在不同酸性部位的选择性吸附和酸性部位在催化剂上的选择性吸附。结果表明，路易斯酸位催化了环氧丙烷在硫酸铝上的重排。然后通过原位漫反射红外傅里叶变换光谱（DRIFTS）研究了环氧丙烷在路易斯酸位上的重排行为，并提出了机理。傅里叶变换红外光谱分析结果表明，催化剂失活主要是由于焦炭的覆盖引起活性位的降低，因此对焦炭的分解进行了研究，以再生出催化剂。