In-situ FTIR investigation of coke formation on USY zeolite

Chiuping Li, Yu Wen Chen, Shien Jeng Yang, Ruey Bing Yen

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Coke formation over USY and steamed USY zeolites was investigated by in-situ FTIR spectroscopy, i.e., an IR cell which simultaneously serves as a reactor using n-hexane cracking as a test reaction and which is attached to a gas chromatograph. The rate of coke formation and catalyst de-activation increased with increasing the concentration of acid sites. The de-activation during n-hexane cracking can be divided into two periods. During the first stage of coke formation, the activity decreased linearly with coke formation. At this stage, coke was predominantly deposited on the Brønsted acid site inside the zeolite structure. In the second stage, which met with a higher coke content, the activity was much less affected by further coke formation. At this stage, coke grew mainly outside the zeolite pores.

Original languageEnglish
Pages (from-to)465-468
Number of pages4
JournalApplied Surface Science
Issue number4
StatePublished - 1 Dec 1994


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