coke deposited on catalyst

Iniciocoke deposited on catalyst

In-Situ Continuous Coke Deposit Removal by Catalytic Steam ...

Jul 09, 2013· A coke removal system removes coke deposit from the walls of a high temperature passage in which hydrocarbon fuel is present. The system includes a carbon-steam gasification catalyst and a water source. The carbon-steam gasification catalyst is applied to the walls of the high temperature passage.

The spect catalyst from a catalytic-cracking reactor ...

Coke deposited on the catalyst in the reactor is removed by burning with air, and the flue gas is vented. the coke is a mixture of carbon and high-molecular-weight tars considered to be hydrocarbons. For the following conditions, calculate the weight percent of hydrogen in the coke.

(PDF) Effect of sulphur on the coking of rhodium in the ...

The major part of the carbon is deposited at the bed inlet on Rh5A and on A1203_Nevertheless, the coke profile is relatively flatter on A1203 and the coke concentrations at the bed outlet are virtually the same on the support and on the catalyst. Fig. 2. Coke profiles in the catalyst bed (L=length corresponding to 600 mg of catalyst).

COKE FORMATION ON SILICA-ALUMINA CRACKING …

The mechanism of coke formation on silica-alumina cracking catalysts was studied by analysis of cracking experiments with seven pure hydrocarbons at 445' C. and n-hexadecane at 500" C. under a variety of process conditions. Coke deposits were isolated from selected catalyst samples for infrared spectral examination.

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, Recent Open Access Articles Sustainable Energy …

Study of coke deposited on a VOx-K2O/Γ-Al2O3 catalyst in ...

A possible coke generation process was proposed, which contained consecutive reactions such as cracking, oligomerization, and aromatization. The establishment of the coke formation mechanisms and study of the nature of the deposited coke provide guidance for future DH catalyst optimization while reducing coke formation.

Fourier transform infrared spectroscopic study of coke ...

Jul 01, 1995· The coke deposit which remains on the catalyst at 580 after an aging time of 180 min may be highly dehydro- genated but these changes are not detected in the aromatic region of its FT-IR spectrum. For this reason, the region near 1400 cm-1 corresponding to aliphatic C-H bending modes has been studied.

Microstructural Investigation of Coke Deposition in ...

Nov 01, 2020· The coke content of the catalyst after 4 h experiment was 24 wt% of the deposits comprising residual oil, asphaltene, metals and coke was determined using thermogravimetric analyser, and the details had been reported elsewhere [7, 8]. The focus of this study is on the impact of coke deposition on the pore network structure of the catalyst pellet.

The effect of coke deposition on the activity and ...

It was observed that the amount of coke deposited over the zeolite has a great influence on the reaction pathway. At higher temperature (400 °C), the spent catalyst was found to exhibit a much higher activity towards the alkylation products (DEB) as compared to the fresh catalyst.

Temperature-Programmed Oxidation of Coke Deposited on ...

Mar 19, 1997· Coke deposited on catalytic cracking catalysts has been investigated by continuously monitoring evolved CO and CO 2 during temperature-programmed oxidation (TPO) in a 1% O 2 /N 2 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 …

Grafted Nickel-Promoter Catalysts for Dry Reforming of ...

1 · Once the type of coke deposit is identified, it is important to correlate the activity of the catalyst with the corresponding type of deposited carbon. For example, the formation of graphitic nanotubes, or whiskers, has been cited as the cause for catalyst deactivation.

Solved Exercise 6 - Material Balance for FCC Regenerator ...

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. The composition of dry flue gas from the regenerator of an FCC unit is given in vol% as follows: …

Coke Aging and Its Incidence on Catalyst Regeneration ...

The effects of a sweeping treatment on the activity recovery, coke content, H/C ratio, and kinetics of coke combustion have been studied in the coke deposited on an HZSM-5 zeolite. The reaction test studied is the transformation of acetone into hydrocarbons at 400 °C, and the gases used in the sweeping are He, H2, and steam. Aside from the partial elimination of coke, which …

Characterization of coke deposited from cracking of ...

T1 - Characterization of coke deposited from cracking of benzene over USY zeolite catalyst. AU - Radwan, Aly Moustafa. AU - Kyotani, Takashi. AU - Tomita, Akira. PY - 2000/2/4. Y1 - 2000/2/4. N2 - Catalytic cracking of benzene was carried out under He or H2 gas flow at 1.0 and 5.0MPa in the temperature range of 500-800°C.

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

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 1.2 The …

(PDF) Structural characterization of coke deposits on ...

Coke characterisation in aged residue hydrotreating catalysts by solid-state 13C-NMR spectroscopy and temperature-programmed oxidation By Enrique Sastre Insights into the coke deposited on HZSM-5, Hβ and HY zeolites during the cracking of polyethylene

Study of coke deposited on atmospheric-residue ...

Apr 11, 2010· The influence of the catalyst loading, pressure, and temperature on the formation of different forms of carbonaceous deposits during the atmospheric-residu Study of coke deposited on atmospheric-residue hydrocracking catalysts | SpringerLink

In-situ continuous coke deposit removal by catalytic steam ...

The carbon-steam gasification catalyst is applied to the walls of the high temperature passage. The water reacts with the coke deposits on the walls of the high temperature passage to remove the coke deposits from the walls of the high temperature passage by carbon-steam gasification in the presence of the carbon-steam gasification catalyst.

Coke formation on an industrial reforming Pt–Sn/γ‐Al2O3 ...

The characterization of the coke deposited on an industrial Pt–Sn/γ‐Al2O3 catalyst, used in a continuous reforming process, was performed with AFM, XRD, FTIR, EPR, NMR, TG‐DTG and DTA techniques. Composition, structure and location of the coke on the catalyst were investigated. The coke was predominantly deposited on the catalyst surface and in the …

Catalytic Cracking Process, Fouling, and Cleaning Methods

Dec 12, 2016· The coke will coat the catalyst preventing it from promoting the cracking reaction. The catalyst is renewed by burning off the coke deposits from the catalyst surface during regeneration. The cracked hydrocarbons are separated …

US6585883B1 - Mitigation and gasification of coke deposits ...

coke coke deposits reactant gas catalyst unit Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US09/685,360 Inventor Simon Robert Kelemen ...

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

@article{osti_5172136, title = {Causes of FCC reactor coke deposits identified}, author = {McPherson, L J}, abstractNote = {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 …

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

Jan 09, 2017· The effect of high levels of coke deposit on catalyst properties and mass transport through the pores space was studied using commercial catalysts, Pt-Al{sub 2}O{sub 3} and Ni-Mo-Al{sub 2}O{sub 3}. Changes in porosity, pore-size distribution and internal surface area of several aged catalysts were compared to those of fresh catalyst.

Current progress on catalytic oxidation of toluene: a ...

These compounds were found to lower the catalyst activity and block the active catalyst site when deposited on the pores and surface of the catalyst. The formation of coke and its removal for catalytic oxidation of toluene on CuNaHY zeolites was investigated (Antunes et al. 2001). In this study, the total burning of coke at 1020 °C using ...