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Characterization of coke deposited on spent catalysts for
2010年10月1日· The analysis of the coke deposited on the longchainparaffin (nC 16–19) dehydrogenation catalysts presents the dynamic process of the coke deposition During2022年2月15日· As have been confirmed, the coke species is highly broad in speciation, covering aliphatic and aromatic compounds as well as graphite that are bothNonDestructive characterisation of coke deposit on FCC
Modern Techniques to Minimize Catalyst Deactivation Due to
2022年3月31日· The coke deposited on the catalyst usually has the H/C ratio in the range of 03–10 The identified coke formation routes in catalytic cracking of heavy oil2016年11月23日· 44 Citations 103 Altmetric Metrics Abstract The formation of carbonaceous deposits (coke) in zeolite pores during catalysis leads to temporaryDiscerning the Location and Nature of Coke Deposition
Identification of extremely hard coke generation by low
2021年4月13日· The coke formation in the catalytic system mainly cause to the catalyst deactivate resulting the dramatic decreasing of the catalyst performance then the2020年3月1日· This review deals with the currently existing alternatives at the catalyst and reactor level to cope with catalyst deactivation and increase process stability, and thenCoke formation and deactivation during catalytic
Carbon Deposit Analysis in Catalyst Deactivation, Regeneration,
2023年4月13日· With pinewood derived biomass, the authors observed thermal coke from large oligomeric species deposits on the external area of the catalyst extrudates,2022年3月23日· It follows from (5) and (6) that both Eqs(4) formally correspond to an increase in the coke concentration regardless of the level of catalyst activity, while the activity decreases with CIn this case, coke is deposited either as a monolayer or in the form of an avalanche, that is, immediately as a thick layer []Despite the simplicity,Coking of Catalysts: Mechanisms, Models, and Influence
Insights into the coke deposited on HZSM5, Hβ and HY zeolites
2011年4月27日· On the basis of the results of FTIR, Raman and UV–vis spectroscopy, 13 C NMR, FTIRTPO and coke extraction, we observe that condensation of aromatic rings in the coke deposited on the spent catalyst increases in step with pore size (HY > Hβ > HZSM5) Aromatic condensation also correlates with coke content [28]2021年3月1日· In this work, the particleresolved model developed by Karthik et al [28] is applied to simulate coke deposition behaviors over catalyst particles in a single particle and a packed bed reactor The governing equations are expressed in Table 2The entire computing region is divided into the free fluid region and the porous particle regionInvestigation of coke deposition inside catalyst with
Effect of coke deposition over microporous and hierarchical
2021年3月26日· The determination of the activation energy (E a) required for coke removal can be used to evaluate the coke deposited on the catalyst surface [23, 24], and the E a values are an indication of how easy the coke can be removed from the catalyst The coke amount can be accurately measured by thermal treatment in oxidant atmosphere [25, 26]on stream for prediction of average coke content depositing on SAPO34 catalyst bed, which is useful to reactor design when is combined with the empirical equations relating average coke content with catalyst activity 2 Experimental 21 Synthesis of SAPO34 molecular sieves Hydrothermal synthesis of SAPO34 was carried out using binaryStudy of coke deposition phenomena on SAPO 34 catalyst and its
Insights into the coke deposited on HZSM5, Hβ and HY zeolites
2011年4月27日· Highlights We studied the principles of coke deposition on zeolites in the pyrolysis of HDPE Two stages of coke development: (1) aromatic and (2) aliphatic growth The number of aromatic rings in the coke follows the trend HY > Hβ > HZSM5 The high flow of N 2 for the pyrolysis helps by prolonging the life of the catalyst2010年10月1日· 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 As most of the coke deposited is flat epitaxial and layered structure, and the surface area of the coke is smaller than that of the fraction of theCharacterization of coke deposited on spent catalysts for long
Elucidating coke formation and evolution in the catalytic steam
2023年5月1日· In order to analyze the evolution of catalyst deactivation, and given that the coke deposited on the catalyst is not homogeneously distributed along the fixed bed as the reaction proceeds, the deactivated catalysts have been characterized in three axial sections and for three times on stream (TOS), namely, 50, 100 and 150 min2023年4月13日· The development of coke species during the time on stream of the solid catalyst, as well as the spatial distribution of the species is likely more important than the absolute amount of coke deposited, 106 which is why it is important to design analytical strategies that can follow the spatial development of coke species over time in entire,Carbon Deposit Analysis in Catalyst Deactivation, Regeneration,
Experimental and computational investigation on underlying factors
2021年1月12日· The interaction between coke and catalyst surface was determined by the adsorption energy (E ads) of one, two, and three carbon atoms on the Ni100, Ni111, Ni211, Co001, NiCo100, NiCo111, and2021年4月13日· Operando ultraviolet–visible light spectroscopy (Operando UV–vis) is used to characterize and observe the species of coke that deposited on the catalyst surface during reaction 15,16,17Identification of extremely hard coke generation by low
Coking behavior and catalyst deactivation for catalytic pyrolysis
2007年8月1日· Coke deposited on catalysts is burnt off in the regenerator, providing the heat for the whole system However, coking will reduce the activity of catalysts and result in the variation of product distribution, because the deposited coke will cover parts of the active sites on catalyst surface2022年6月1日· The CO yield of CoNi bimetallic coreshell catalyst is higher than that of Ni@SiO 2 catalyst mainly for the following reasons, (1) cobalt metal can adsorb CO 2, which promoted the Boudouard reaction (C + CO 2 → 2CO) and consumed the coke deposited on the surface to produce more CO with high resistance coke depositionEffect of NiCo bimetallic coreshell catalyst for coke resistance in
Coke formation in fluid catalytic cracking ScienceDirect
1997年1月1日· After this initial coke formation, only at higher catalysttooil ratios some additional coke formation was observed In order to model the whole process properly, the coke deposition and catalyst deactivation have to be divided in an initial process (typically within 015 s) and a process at a larger time scale2021年8月15日· Coke I is deposited in the catalyst matrix (mesoporous structure), which facilitates its combustion at lower temperatures, whereas coke II is deposited in the micropores, and, therefore, its combustion takes place at higher temperatures because of the constrains imposed by shape selectivity [5, 31, 32] Download : Download highresCoke deactivation and regeneration of HZSM5 zeolite catalysts
Coke Formation an overview | ScienceDirect Topics
The assumption that coke formation is not accompanied by the formation of other products is not completely valid; due to stripping a transformation of coke deposited on the catalyst takes place The coke is made more aromatic by the removal of small, hydrogenrich molecules during stripping [7–9,22,23]2022年3月31日· Most importantly, the coke deposited on the catalyst was significantly minimized by approximately 20 wt % than 574 wt % coke observed without the use of structured activated carbon guard bed Hence, the placement of guard bed upstream the catalyst bed can minimize catalyst deactivation due to coke formation remarkablyModern Techniques to Minimize Catalyst Deactivation Due to Coke
Coke Deposition Inhibition for Endothermic Hydrocarbon Fuels
2019年6月25日· The amount of coke deposited in a bare reactor is nearly twice that deposited in a reforming catalyst coated reactor, and the coke formation rate in the former case is eight times that in the2015年5月9日· The catalyst is separated from the product mixture and stripped of remaining useful product by steam treatment The products are further refined downstream The catalyst material, on which a certain amount of carbon, better known as coke, has been deposited during the cracking process, is transported to the regenerator, whereFluid catalytic cracking: recent developments on the grand old
Investigation of coke deposition during catalytic cracking of
2021年8月25日· O 2TPO can be regarded as the thorough oxidization and removal of coke deposited on catalysts During O 2TPO tests, about 10 mg spent catalyst was preheated to 300 °C in He stream This process was kept for 30 min, then it