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Active sites and coke on aluminum sulfate for the rearrangement of propylene oxide
Author(s) -
Zhang Baoqiang,
Liang Mengnan,
Zhu Yingluo,
Ma Weihua
Publication year - 2020
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2582
Subject(s) - coke , catalysis , chemistry , inorganic chemistry , thermogravimetry , diffuse reflectance infrared fourier transform , lewis acids and bases , fourier transform infrared spectroscopy , oxide , decomposition , infrared spectroscopy , propylene oxide , diffuse reflection , organic chemistry , chemical engineering , photocatalysis , polymer , physics , ethylene oxide , optics , engineering , copolymer
Abstract 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.