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coke deposited on catalyst

2020-03-29T17:03:13+00:00
  • Characterization of coke deposited on spent catalysts for ...

    2010-10-01  During the dehydrogenation of n -C 16–19, coke gradually accumulates on the surfaces of the catalysts while the coking rate and the H/C mole ratio of the coke decrease. After the times on stream (TOS) of 960 h, the coke deposition on the catalysts is up to 6.56 wt.%, and the H/C mole ratio of the coke is only 0.86.

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  • Fixed Bed Naphtha Reformer Catalyst Regeneration: A ...

    2020-09-30  The catalyst used was a single base metal oxide on an inert support. The catalyst performance declined quickly as coke deposits formed on the catalyst. After 20 to 40 minutes in operation it was necessary to take the reactor out of service to burn the coke deposits off the catalyst.

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

    2005-09-28  Coke appears to be deposited both on the metal and the support, with the coke on the metal being more easily oxidized by TPO. Raman spectroscopy shows that there is no significant change in the carbon crystallite size on any of the catalysts; all are within the range of 1.45–1.83 nm.

  • Cited by: 148
  • coke deposited on catalyst - plusict.be

    Characterising carbon deposited during pyrolysis gasoline. indicate the amount of coke deposited on the surface of the catalyst The oxygen consumption is commonly mirrored by the production of CO 2, as shown in Fig 2 The combustion of hydrogen rich coke, which is mostly present on the catalytic metal, occurs first This is followed by the combustion of the hydrogen deficient coke present.

  • coke deposited on catalyst

    Question: 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: Gas Volume % N2 81.6 CO2 15.7 CO 1.5 O2 ...

  • US4425259A - Endothermic removal of coke deposited on ...

    Deactivated catalyst is partially regenerated in the presence of carbon dioxide containing gas before or after oxygen regeneration at a temperature below 1600° F. to provide a regenerated catalyst which is recycled to the conversion zone for further contact with fresh feed. The metal additive is present on the catalyst in an amount sufficient to catalyze the endothermic removal of ...

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  • 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.

  • Frontiers Original Method to Predict and Monitor Carbon ...

    Figure 6A shows only one significant weight loss in the 550–695°C temperature range, which is due to the combustion of coke deposited on the catalyst. Besides the weight loss, a slight weight gain caused by the oxidation of metallic particles was also observed. There was a 7.8 wt% of weight loss for the 13IMPNi18LaN-B spent sample. For the 10IMPNi6LaN-A spent sample, the weight loss was 19 ...

  • 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:

  • coke deposited on catalyst

    Question: 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: Gas Volume % N2 81.6 CO2 15.7 CO 1.5 O2 ...

  • 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. Analyses were carried out on spent samples recovered from an industrial catalytic cracker and on coke prepared in the laboratory by exposure of fresh catalyst to 1-hexene and cyclohexene at 500 °C.

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

    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 is concerned with a fifth type of coke. This coke does not deposit on the catalyst but adheres to internal surfaces of the reactor and downstream equipment causing refiners a variety of problems. In ...

  • (560ed) Assessment of the Coke Deposited on Lamellar Metal ...

    FTIR-TPO has also been used to investigate the changes in the nature of the coke during the catalyst regeneration through combustion. The results show that the total amount of coke and the heavy coke fraction are reduced in the lamellar zeolite compared to its solely microporous analogue due to its meso-/microporous structure that provides lower diffusion limitations for bulky coke precursors ...

  • US4425259A - Endothermic removal of coke deposited on ...

    Deactivated catalyst is partially regenerated in the presence of carbon dioxide containing gas before or after oxygen regeneration at a temperature below 1600° F. to provide a regenerated catalyst which is recycled to the conversion zone for further contact with fresh feed. The metal additive is present on the catalyst in an amount sufficient to catalyze the endothermic removal of ...

  • Frontiers Original Method to Predict and Monitor Carbon ...

    Figure 6A shows only one significant weight loss in the 550–695°C temperature range, which is due to the combustion of coke deposited on the catalyst. Besides the weight loss, a slight weight gain caused by the oxidation of metallic particles was also observed. There was a 7.8 wt% of weight loss for the 13IMPNi18LaN-B spent sample. For the 10IMPNi6LaN-A spent sample, the weight loss was 19 ...

  • Kinetics of De-coking of Spent Reforming Catalyst

    This indicates that the major form of coke deposit on the spent catalyst is hard coke which can be removed with proper de-Coking methods. This represents 62.8% of the total coke analysed on the spent catalyst. Table 1: Individual (Ind) and total weight loss in (TGA) de-coking, presented in weight percentages at heating rates (10 °C /min, and 15 °C /min) and at various temperatures range ...

  • The guiding role of pre-coking on the coke deposition over ...

    Catalyst using 1-hexene as pre-coke species has lower external surface compared with catalyst using methanol as coke precursor at the same reaction conditions. This is due to the fact that a large molecule is more likely to be condensed and deposited on the external surface of the zeolite [ 43 ].

  • FCC catalyst coolers in maximum propylene mode

    CCR in the feed increases the amount of coke deposited on the catalyst as it passes through the riser. The increased concentration of coke on the catalyst as it passes through the reactor is referred to as delta coke. Without intervention, increasing delta coke leads to a high regenerator temperature, reducing FCC feed conversion due to lowering of the catalyst-to-oil ratio and accelerated ...

  • Characterising carbon deposited during pyrolysis gasoline ...

    indicate the amount of coke deposited on the surface of the catalyst. The oxygen consumption is commonly mirrored by the production of CO 2, as shown in Fig. 2. The combustion of hydrogen rich coke, which is mostly present on the catalytic metal, occurs first. This is followed by the combustion of the hydrogen deficient coke present on the surface of the catalyst [4, 12]. The ratio of CO 2/H ...

  • Petroleum coke, catalyst

    The carbonaceous residue that is deposited on and deactivates the catalyst used in many catalytic operations (e.g., catalytic cracking). Carbon is deposited on the catalyst, thus deactivating the catalyst. The catalyst is reactivated by burning off the carbon, which is used as a fuel in the refining process. That carbon or coke is not ...

  • 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. Analyses were carried out on spent samples recovered from an industrial catalytic cracker and on coke prepared in the laboratory by exposure of fresh catalyst to 1-hexene and cyclohexene at 500 °C.

  • (560ed) Assessment of the Coke Deposited on Lamellar Metal ...

    FTIR-TPO has also been used to investigate the changes in the nature of the coke during the catalyst regeneration through combustion. The results show that the total amount of coke and the heavy coke fraction are reduced in the lamellar zeolite compared to its solely microporous analogue due to its meso-/microporous structure that provides lower diffusion limitations for bulky coke precursors ...

  • Effects of Coke Deposits on the Catalytic Performance of ...

    Effects of Coke Deposits on the CatalyticPerformance of Large Zeolite H-ZSM-5 Crystals duringAlcohol-to-Hydrocarbon Reactions as Investigated by aCombination of Optical Spectroscopyand Microscopy EmilyC.Nordvang,[b] Elena Borodina,[a] Javier Ruiz-Martnez, [a] Rasmus Fehrmann,[b] and Bert M. Weckhuysen*[a] Abstract: The catalytic activity of large zeolite H-ZSM-5 crys-tals in methanol

  • Solved: Burning The Coke Deposited On The Catalyst Particl ...

    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: Gas Volume % N2 81.6 CO2 15.7 CO 1.5 O2 1.2 The dry air flow rate to the regenerator is given as ...

  • US4450241A - Endothermic removal of coke deposited on ...

    US4450241A US06/418,880 US41888082A US4450241A US 4450241 A US4450241 A US 4450241A US 41888082 A US41888082 A US 41888082A US 4450241 A US4450241 A US 4450241A Authority US United States Prior art keywords catalyst carbon coke weight process Prior art date 1981-08-05 Legal status (The legal status is an assumption and is not a legal conclusion.

  • Dynamics of carbon formation during the catalytic ...

    The formation, growth and transformation of the carbon residue (coke) deposited on the catalyst during the raw bio-oil hydrodeoxygenation have been studied. These deposits have a great impact on the overall process performance, and they have been formed in accelerated deactivation conditions (450 °C, 65 bar, space time of 0.09 g cat h g bio-oil −1 ) using a continuous fixed bed reactor and ...

  • The guiding role of pre-coking on the coke deposition over ...

    Catalyst using 1-hexene as pre-coke species has lower external surface compared with catalyst using methanol as coke precursor at the same reaction conditions. This is due to the fact that a large molecule is more likely to be condensed and deposited on the external surface of the zeolite [ 43 ].

  • Coke Formation over a Nickel Catalyst under Methane Dry ...

    This thermodynamic analysis elucidates the significance of the CO disproportionation reaction on the amount of coke deposited over the catalyst under consideration. A kinetic model with negative overall order of one, with respect to the partial pressure of carbon monoxide, is found as the most accurate prediction of the rate of coke formation. This type of kinetics strongly suggests the ...

  • Active coke: Carbonaceous materials as catalysts for ...

    that carbonaceous material, coke, deposited during reaction over VO x /Al 2 O 3 can act as an active catalyst in the non-oxidative dehydrogenation of n-butane. This conclusion is confirmed through a comparison of the activity of coked VO x /Al 2 O 3 and carbon nanofibres. To this end a wide num-ber of advanced techniques are employed including the first application of terahertz time-domain ...

  • Solved: Burning The Coke Deposited On The Catalyst Particl ...

    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: Gas Volume % N2 81.6 CO2 15.7 CO 1.5 O2 1.2 The dry air flow rate to the regenerator is given as ...

  • Dynamics of carbon formation during the catalytic ...

    The formation, growth and transformation of the carbon residue (coke) deposited on the catalyst during the raw bio-oil hydrodeoxygenation have been studied. These deposits have a great impact on the overall process performance, and they have been formed in accelerated deactivation conditions (450 °C, 65 bar, space time of 0.09 g cat h g bio-oil −1 ) using a continuous fixed bed reactor and ...

  • Nitrogen Chemistry and Coke Transformation of FCC Coked ...

    Fluid catalytic cracking (FCC) is one of the most important processes in petroleum refining for converting high-boiling hydrocarbon fractions into valuable products, particularly gasoline and light cycle oil 1.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 ...

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  • Effects of Coke Deposits on the Catalytic Performance of ...

    Effects of Coke Deposits on the CatalyticPerformance of Large Zeolite H-ZSM-5 Crystals duringAlcohol-to-Hydrocarbon Reactions as Investigated by aCombination of Optical Spectroscopyand Microscopy EmilyC.Nordvang,[b] Elena Borodina,[a] Javier Ruiz-Martnez, [a] Rasmus Fehrmann,[b] and Bert M. Weckhuysen*[a] Abstract: The catalytic activity of large zeolite H-ZSM-5 crys-tals in methanol

  • Predicting the amount of coke deposition on catalyst ...

    2016-09-20  In a catalyst based continuous production process, one of the key issues that should be addressed is the automatic control of the multiphase flow reactor. The selectivity and effi

  • Gasification of Coke Deposited on Nickel Ore Particles

    In the present work, the coke-deposited-catalyst whose properties are shown in Table 1 was heated in a tubular reactor at the rate of 15°C/min in a stream of nitrogen. As soon as the temperature had reached 800°C or 900°C, the gas stream was switched to air and steam. Methane, hydrogen, carbon monoxide, and carbon dioxide were generated by heating the catalyst in the stream of nitrogen as ...

  • for coke formation in a catalyst pore arXiv:cond-mat ...

    tions and coke formation is a fundamental aspect for catalyst deactivation. The aim of this work is to study the morphology of the deposits generated by a statistical model of diffusion and aggregation of a chemical species inside a catalyst pore. The shape of a deposit changes in time due to the diffusion-limited aggregation of residues. Two ...

  • 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. The composition of the spent catalyst also conformed with inductively coupled plasma (ICP) indicating that a considerable amount of foreign species were deposited (as shown in Table 1). Refinery, ARDS hydroprocessing ...

  • Reversible Nature of Coke Formation on Mo/ZSM‐5 Methane ...

    2019-03-22  Notably, the total amount of coke deposits is increased at elevated pressure, showing how reversible growth of coke deposits results in a higher pore utilization. The current finding, that elevated pressure operation has such a strong positive effect on the performance of Mo/ZSM‐5, is also important for practical methane valorization, as it eliminates the need to depressurize the natural gas ...

  • 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. The composition of dry flue gas from the regenerator of an FCC unit is given in vol% as follows: Table 7.7 Gas Volume ...

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