ESTIMATION OF TOXIC COKE DEPOSITS ON FRESH AND REGENERATED Pt/Al2O3CATALYST FROM METHYLCYCLOPENTANE REFORMING IN H2AND N2ATMOSPHERES
| Autor: | John A. Osaheni, Dominic Okechukwu Onukwuli, Alfred A. Susu |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
General Chemical Engineering Energy Engineering and Power Technology Mineralogy chemistry.chemical_element General Chemistry Partial pressure Coke Geotechnical Engineering and Engineering Geology Heterogeneous catalysis Catalysis chemistry.chemical_compound Fuel Technology Hydrocarbon chemistry Catalytic reforming Platinum Methylcyclopentane Nuclear chemistry |
| Zdroj: | Petroleum Science and Technology. 17:759-781 |
| ISSN: | 1532-2459 1091-6466 |
| DOI: | 10.1080/10916469908949748 |
| Popis: | An estimate of the quantity of toxic coke deposited on fresh and regenerated Pt/Al 2 O 3 catalyst has been determined for methylcyclopentane (MCP) reforming in a Berty CSTR at 390°C, W/F=0.11 g.min/cm 3 , total pressure of 1 atm and MCP partial pressure of 0.092 atm in H 2 or N 2 carrier. Eleven cycles consisting each of catalyst deactivation, regeneration and reduction were investigated with 3 in H 2 and 8 in N 2 . Oxidizable (primary) coke deposits were higher in N 2 . However, higher levels of toxic (secondary) coke were deposited in H 2 . The ratio of oxidizable to toxic coke lies between 1-15x10 3 in H 2 and 22-55x10 3 in N 2 . The coke-time profiles for secondary coke removal exhibited maxima suggestive of three types of secondary coke with varying reactivity in H 2 . Furthermore, the results strongly suggest that the cokes were layered on acidic coke forming sites with the solid phase transformation of primary to secondary coke occurring at the catalyst-coke interface. |
| Databáze: | OpenAIRE |
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