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Adsorption of propene and coke formation on a cracking catalyst (FCC)

✍ Scribed by J.L. Figueiredo; M.L.G.O.M. Pinto; J.J.M. Órfa˜o

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
439 KB
Volume
104
Category
Article
ISSN
0926-860X

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✦ Synopsis

The adsorption of propene and its conversion into coke on a FCC catalyst was studied as a function of the temperature and of the residual activity after selective poisoning of the acid sites. It is shown that coke formation involves the strongest acidsites, capable of retaining 2,6-dimethylpyridine at 450•C. The nature of the coke and its reactivity were found to change with the deposition temperature. The coke obtained in the temperature range 300•C-500•C could be resolved by DSC into a mixture of two components of different reactivity.

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Coke formation from propene was investigated at 623 K and P propene 100 kPa on a pure 5A zeolite and an industrial adsorbent (5A zeolite 80 wt.%±binder 20 wt.%). The composition and location of coke molecules were determined as a function of time on stream. Coking on the pure zeolite was faster than