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The Mechanism of Coke Formation on Catalysts

Nature of Coke Type The transient characteristics of catalyst aging and the nature of coke deposits on aged catalysts led us to suggest that there are several types of coke deposits on catalysts For example, the characteristic profile of coke on catalysts always Coke is high atthe top of the bed, high at This behavior has led to the kind of ....

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Burning the coke deposited on the catalyst particles

Question Material Balance for FCC Regenerator Problem 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...

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Coke deposition mechanism on the pores of a commercial Pt ,

coke deposited on the walls of the nano-pores of the catalyst at a pores is given by brN = 2Vp/S, where Vp is the pore volume and S is constant thickness of 10 nm...

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In operando detection of coke deposits on a fixed

In operando detection of coke deposits on a fixed-bed catalyst by a microwave method Peter Fremerey 1,2, Dieter Rauch 1,2, Andreas Jess 1, Ralf Moos 2 1 Department of Chemical Engineering, 2 Department of Functional Materials, University of Bayreuth, Zentrum f├╝r Energietechnik, 95440 Bayreuth, Universit├Ątsstra 223 e 30, Germany....

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The Normal feed for FCC unit is HVGO HCGo from coker In ,

Coke is dependent on number of factors such as Reactor temperature, higher the temperature greater is the coke, Catalyst to Oil ratio, higher the catalyst to oil greater is the conversion too, feed preheat temperature, type of the feed stock, aromatic and olefinic streams form greater coke, recycle streams also could lead more coke, management ....

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Structural characterization of coke deposits on industrial ,

Coke deposition on spent noble metal catalysts used in petroleum/petrochemical industries is of serious concern on account of its impact on the catalyst deactivation and consequent loss in the ....

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Things go better with coke the beneficial role of ,

Carbonaceous or hydrocarbonaceous deposits formed on the surface of heterogeneous catalysts during reaction are typically associated with catalyst deactivation through coking...

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M Marafi M S Rana Kuwait Institute for Scientific ,

The deposited carbon coke and metals on the spent catalyst were determined using thermogravimetry analysis TGA and scanning electron microscopy SEM/EDX , respectively...

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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 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...

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Advances in the study of coke formation over zeolite ,

Generally, coke evolution must be a dehydrogenation process in which hydrogen is continuously extracted from the deposited and depositing products that cannot then be moved continuously from the system 1, 2, 3, 4 However, the exact coke formation process appears to ,...

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Material Balance For FCC Regenerator Problem Burni ,

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 ,...

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Deposition and characteristics of coke over a H

The distribution of the coke within the porous structure of the catalyst is similar to that proposed for other reactions on H-ZSM5 zeolites, and the highly hydrogenated character of coke ,...

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Process for the regeneration of coke

Feb 12, 1997 0183 32 In the zone 1, the second gas is contacted with the spent catalyst at a temperature of 400-600 176 C so that the coke deposited on the catalyst is burnt and is converted into CO and CO 2 The hydrogen and sulfur if present on the catalyst are also converted into ,...

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Characterization of coke deposited on spent catalysts for ,

The change of the surface area of the catalysts after coke deposition depends not only on the coke content but also on the way in which the coke is deposited on the catalyst surface...

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Dynamic modeling of catalyst regeneration

parallel coke with 1vol oxygen may lead to an unexpectedly high temperature increase of about 550 176 C, ie 400 176 C higher overheat temperature compared to the expected conventional adiabatic steady-state value 4 Conclusions It was found, that the characteristics of the coke deposited on zeolite catalyst in connection methanol-to-...

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The enhancement of the catalytic performance of CrOx/Al2O3 ,

Coke deposited after pre-coking with aromatic molecules, and in particular with benzene, was beneficial for dehydrogenation activity, as shown by the increase in styrene selectivity relative to the fresh catalyst...

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51 Petroleum Refining1

regenerator, coke deposited on the catalyst as a result of the cracking reactions is burned off in a controlled combustion process with preheated air Regenerator temperature is usually 590 to 675 176 C 1100 to 1250 176 F The catalyst is then recycled to be mixed with fresh hydrocarbon feed...

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Indian refinery presents troubleshooting examples for a ,

These observations suggested that there must be certain catalyst parameters that affect the ease with which deposited coke on the catalyst burns Based on further study, Indian Oil concluded that ....

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FCC UNITS BENEFIT FROM RECENT CATALYST ADVANCEMENTS

A catalyst supplier helped the refiner fine-tune its FCC catalyst formulation to decrease delta coke , large asphaltene molecules and allow the metals they contain to be deposited and ....

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coke deposited on catalyst

Burning the coke deposited on the catalyst particles generates all the heat necessary for catalytic cracking Therefore, the coke burning rate is a critical Petroleum coke - Wikipedia Petroleum coke, abbreviated coke or petcoke, is a final carbon-rich solid material that derives from oil refining, and is one type of the group of fuels ....

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Causes of FCC reactor coke deposits identified

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 This article ....

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Solved Exercise 6

Show transcribed image text Exercise 6 - Material Balance for FCC Regenerator Problem 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...

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Coke deposition on supported palladium catalysts

mainly to coke deposited on the 111 planes whereas the carbon which is oxidized at higher temperature would be deposited on palladium atoms of lower coordination...

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Detection of coke deposits on a fixed

These coke deposits lead to catalyst deactivation owing to fouling They block the active sites of the catalyst and hinder the mass transfer into the pores 1 Therefore, the coke has to be removed by burn-off with oxygen to restore the full catalytic activity...

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Characterization of Coke Deposited from Cracking of ,

Characterization of Coke Deposited from Cracking of Cottonseed Oil over Zeolite Catalyst and Deactivation Kinetics of Coke Deposition , Characterization of Coke Deposited from Cracking of Cottonseed Oil over Zeolite Catalyst and Deactivation Kinetics of Coke Deposition...

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Characterization of coke deposited on spent catalysts for ,

Read Characterization of coke deposited on spent catalysts for long-chain-paraffin dehydrogenation, Chemical Engineering Journal on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips...

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Effects of Coke Deposits on the Catalytic Performance of ,

Nov 23, 2015 0183 32 The catalytic activity of large zeolite H-ZSM-5 crystals in methanol MTO and ethanol-to-olefins ETO conversions was investigated and, using operando UV/Vis measurements, the catalytic activity and deactivation was correlated with the formation of coke...

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Nitrogen Chemistry and Coke Transformation of FCC Coked ,

Regeneration of the coked catalyst is an important process of fluid catalytic cracking FCC in petroleum refining, however, this process will emit environmentally harmful gases such as nitrogen and carbon oxid Transformation of N and C containing compounds in industrial FCC coke under thermal ....

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Catalysts Deactivation by Coking

coke in catalysts deactivation reflect differences in coke precur- sors and catalyst used Therefore effects that are manifest with one type of feed and catalyst do not necessarily extrapolate to a different feed and catalyst, even though the same culprit, coke ,It is apparently cited in all cas...

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REGENERATION KINETICS SILICA

REGENERATION KINETICS OF COKED SILICA-ALUMINA CATALYST R Hughes M Parvinian Department of Chemical Engineering University of Salford Salford M5 4wT England INTRODUCTION The regeneration of coked catalysts be means of a gas stream containing a few per cent of oxygen is a well established process...

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