coke deposited on catalyst

Coke Deposited On Catalyst

Characterization of Coke Deposition in the Catalytic Fast ...

Sep 18, 2013 · Coke deposition on the zeolite catalysts in the conversion of furan (a main intermediate of biomass fast pyrolysis) is of serious concern for catalyst deactivation and product distribution. It is important to find out the nature and composition of coke on the spent ZSM-5 catalyst to study the coke-depositing behaviors. In this work, spent ZSM-5 catalysts obtained from furan catalytic ...

Coke Deposited On Catalyst

Coke Deposited On Catalyst Burning the coke deposited on the catalyst particles Burning the coke deposited on the catalyst particles generates all the heat necessary for catalytic cracking. Therefore, the coke burning rate is a critical

Temperature-Programmed Oxidation of Coke Deposited on ...

Coke deposited on catalytic cracking catalysts has been investigated by continuously monitoring evolved CO and CO2 during temperature-programmed oxidation (TPO) in a 1% O2/N2 mixture.

Characterization of coke deposited on spent catalysts for ...

Oct 01, 2010 · The analysis of the coke deposited on the long-chain-paraffin (n -C 16–19) dehydrogenation catalysts presents the dynamic process of the coke deposition. Coking is one of the side reactions of the long-chain-paraffin dehydrogenation reaction.

Temperature-Programmed Oxidation of Coke Deposited by 1 ...

The properties of coke deposited by 1-octene on fresh cracking catalysts have been investigated by analyzing CO, CO2, and H2O evolution during temperature-programmed oxidation (TPO). Of particular significance in the analysis is that the combustion mechanism dependence of the CO and CO2 profiles were taken into account.

Characterization of coke deposited on Pt/alumina catalyst ...

Sep 28, 2005 · Coke deposition has been a more challenging problem on Ni-based catalysts, especially with heavier hydrocarbons and liquid fuels that contain aromatic compounds. Many previous studies on Pt reforming catalysts have focused on catalysts used in the catalytic reforming of naphtha.

Fluid Catalytic Cracking (FCC) | FSC 432: Petroleum Refining

After removing the adsorbed hydrocarbons by steam stripping, the coked catalyst is sent to the regeneration unit to burn off the coke with air. Heat released from burning the coke deposit increases the temperature of the catalyst particles that are returned to the riser to complete the cycle.

On the catalytic role of superficial VOx species and coke ...

Superficial isolated VO 4 and deposited coke were responsible for catalytic activity. The catalyst containing 10 wt% of V exhibited EB conversion of 63.6% at 500 °C. O 2 :EB molar ratio of 1.0 was optimal in terms of the best catalytic activity. Complete restoration of catalyst activity was possible after a short treatment in air.

Coke on catalysts-harmful, harmless ... - ScienceDirect

As McCarty and Wise showed, in general the coke deposited at a lower temperature can also react with gaseous hydrogen to form methane, and thus leave the catalyst surface at a relatively lower temperature. In this respect, the coke can be graded into young, medium I, medium II and old coke.

Material Balance For FCC Regenerator ProblemBurnin ...

Burning the coke deposited on the catalyst particles generates all the heat necessary for catalytic cracking. Therefore, the coke burning rate is a critical parameter to control the rate of cracking. The composition of dry flue gas from the regenerator of an FCC unit is given in vol% as follows:

Petroleum coke - Wikipedia

Petcoke is the coke that, in particular, derives from a final cracking process—a thermo-based stone engineering process that splits long chain hydrocarbons of petroleum into shorter chains—that takes place in units termed coker units. (Other types of coke are derived from coal.)

Causes of FCC reactor coke deposits identified (Journal ...

Several years ago, ARCO personnel described four distinct types of coke produced in the catalytic cracking process. This coke is deposited on the catalyst during the reaction stage and is subsequently burned off in the regenerator to provide the essential heat to maintain the unit in heat balance.

F SC Ex. 6 - Exercise 6 Material Balance for FCC ...

Unformatted text preview: Exercise 6 - Material Balance for FCC Regenerator Burning the coke deposited on the catalyst particles generates all the heat necessary for catalytic cracking. Therefore, the coke burning rate is a critical parameter to control the rate of cracking.

Fluid catalytic cracking - Wikipedia

Since the cracking reactions produce some carbonaceous material (referred to as catalyst coke) that deposits on the catalyst and very quickly reduces the catalyst reactivity, the catalyst is regenerated by burning off the deposited coke with air blown into the regenerator.

Coke deposition and product distribution in the co ...

As a consequence of the partial blockage of the acid sites of the zeolite by coke, the catalyst is deactivated within the limited contact time between the catalyst and the feed (in the order of seconds). This spent catalyst circulates to the stripper and the regenerator to recover its activity [ 40 ].

Nitrogen Chemistry and Coke Transformation of FCC Coked ...

Jun 08, 2016 · During the cracking process, a fraction of feedstock deposits on the acid sites of the FCC catalyst, and transforms into coke via a series of polymerisation and dehydrogenation reactions, which is reversible via oxidation regeneration 2, 3.

Thermafor Catalytic Cracking (TCC) | FSC 432: Petroleum ...

The deactivated catalysts removed from the bottom of the reactor are sent to a regenerator unit where the coke on catalysts surfaces are burned off and the heated catalysts particles are recycled to the top of the reactors by bucket elevators. Hot catalyst particles provide most of the heat necessary for the cracking reactions in the reactor.

Characterization of Coke on a Pt-Re/γ-Al2O3 Re-Forming ...

The characterization of coke on spent catalysts is key to understanding deactivation mechanisms in hydrocarbon transformations.

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