Comparison of coke burning on catalysts coked in a commercial plant and in the laboratory

Pieck, C.L.; Parera, J.M.

doi:10.1021/ie00096a008

Cited by 10 publications

(1 citation statement)

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“…This is because nitrogen does not possess the ability of hydrogen in converting coke precursors to harmless hydrocarbons. It should be noted here that Pieck and Perera, 1989 reported otherwise that the nature of the coke found on the laboratory coked catalyst was different from that produced on the commercially coked catalyst in that the former was richer in hydrogen. The uncertainty here had been whether the transformation undergone on the reforming catalyst to achieve the mortal state in the laboratory could be extrapolated to the industrial catalyst, where hydrogen is used.…”

Section: Introductionmentioning

confidence: 63%

Investigation of Prolonged Deactivation-Regeneration Regimes on the Dehydrogenation Activity of Platinum/Alumina Catalyst

Ngomo

Susu

2001

Petroleum Science and Technology

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The various types of coke found deposited on a deactivated Pt/Al 2 O 3 reforming catalyst are described. They are claSsified into major types: oxidiZable (primary) coke, reducible (secondary) coke and non oxidizable and non reducible (tertiary) coke. Primary coke is generally non toxic to catalytic hydrocarbon conversion as its removal restores initial catalyst activity. The secondary and tertiary forms are, however, toxic to this reaction. A methodology for the prolongation of reforming catalyst life is evident from these results. In the new method, secondary coke is also removed from the catalyst surface subsequent to primary coke removal. Results of the application of this methodology using accelerated aging of Pt/Al 2 O 3 catalyst is presented. The overall catalyst life was extended for up to 52 deactivation-regeneration cycles from the 23 previously reported. Catalyst life was not correlated with the oxidizable and reducible * Present address: ORDER REPRINTS 284NGOMO AND SUSU coke content. These profiles were found to be aperiodic and exhibited a nonlinear dynamic behavior. In contrast, catalyst life per cycle of deactivation-regeneration correlate with the rate of oxidizable coke deposition. The model coking reaction investigated was the dehydrogenation of cyclohexane to benzene in nitrogen carrier at 430 • C on a commercial Pt/Al 2 O 3 catalyst using a Berty CSTR.

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Section: Introductionmentioning

confidence: 63%