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- W1979932970 abstract "The process of coke deposition during the dehydrogenation of butene to butadiene over a chromia-alumina catalyst has been studied by Fourier transform infrared spectroscopy. The study was carried out on samples of coked catalyst dispersed on KBr pellets. The aromatic CC stretching (1630-1500 cm−1) and aliphatic CH bending (1450-1300 cm−1) regions of the spectra were examined by curve-fitting analysis in order to improve the information provided by Fourier transform infrared spectroscopy. Different steps in the process of coke deposition were observed. At low temperature the coke is formed by polyolefinic chains rather than by aromatic structures. Aromatization of coke takes place with increasing temperature and can be followed by observing the peak at 1590 cm−1. The aging of the coke in nitrogen does not produce modifications in its aromaticity and the observed dehydrogenation is due to the loss of aliphatic structures as is revealed by the 1385 cm−1 band." @default.
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- W1979932970 date "1995-07-01" @default.
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- W1979932970 title "Fourier transform infrared spectroscopic study of coke deposits on a Cr2O3Al2O3 catalyst" @default.
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- W1979932970 doi "https://doi.org/10.1016/0924-2031(95)00005-f" @default.
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