Regeneration of zeolite-containing catalysts of alkylation of isobutane with the butane-butene faction in supercritical carbon dioxide

Shiriyazdanov, R. R.

doi:10.1134/s1990793111070086

Cited by 13 publications

(7 citation statements)

References 2 publications

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“…Sintering of the metal particles and segregation of different metals may take place during the thermal regeneration process that makes some changes in the catalysts morphology, surface area, and porosity, which can reduce their active life time [5,6]. The water which is produced during coke combustion enhances the removal of chlorine.…”

Section: Introductionmentioning

confidence: 99%

Improving Plasma Regeneration Conditions of Pt–Sn/Al2O3 in Naphtha Catalytic Reforming Process Using Atmospheric DBD Plasma System

Hafezkhiabani

Fathi

Shokri

2015

Plasma Chem Plasma Process

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The catalytic naphtha reforming is one of the largest processes of petroleum industry that is used to rebuild the low-octane hydrocarbons in the naphtha to more valuable high-octane gasoline called reformate without changing the boiling point range. An atmospheric pressure pin to plate dielectric barrier discharge (DBD) plasma was used to remove carbonaceous contaminant from the coked Pt-Sn/Al 2 O 3 catalysts during the naphtha reforming process. The effects of treatment time and flow ratios of O 2 /Ar and O 2 / He on the carbon content of the coked catalysts were investigated. The produced radicals and active species of the plasma process were identified by optical emission spectroscopy. To confirm removing the coke from the catalyst, thermal gravimetric/differential thermal analysis and temperature programmed oxidation analysis were done. Effects of treatment time and flow ratios of O 2 /Ar and O 2 /He on the carbon content of the coked catalysts were investigated by applying elemental analysis. The results of X-ray diffraction, X-ray fluorescence, Brunauer-Emmett-Teller, and CO adsorption showed that the structure and specifications of regenerated catalysts remained without significant changes during the plasma treating. The catalyst performance test revealed that DBD plasma regenerated catalysts increased the aromatic content of the feed as well as the fresh catalysts. The results showed that the plasma treatment method for regeneration of Pt-Sn/Al 2 O 3 can be applied at lower temperature and pressure relative to the thermal regeneration method.

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Section: Introductionmentioning

confidence: 99%

Improving Plasma Regeneration Conditions of Pt–Sn/Al2O3 in Naphtha Catalytic Reforming Process Using Atmospheric DBD Plasma System

Hafezkhiabani

Fathi

Shokri

2015

Plasma Chem Plasma Process

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“…Unlimited mutual solubility of some substances in the supercritical state, as well as a high solubility of coke precursors in such media, can significantly extend the life of catalysts. Readily achievable critical parameters of CO 2 (31.2°C, 7.28 MPa) make scCO 2 widely used as a supercritical solvent and allow for the possibility of using it for the regeneration of zeolite catalysts (Shiriyazdanov 2011). For example, the regeneration of a zeolite-containing catalyst (ZCC) used for alkylation of isobutene with butane-butene fraction (BBF) in scCO 2 demonstrated that treatment of the alkylation catalyst in scCO 2 leads to restoration of its activity and selectivity to the level of the fresh catalyst (Shiriyazdanov 2011).…”

Section: Olefin Alkylation Processmentioning

confidence: 99%

“…Readily achievable critical parameters of CO 2 (31.2°C, 7.28 MPa) make scCO 2 widely used as a supercritical solvent and allow for the possibility of using it for the regeneration of zeolite catalysts (Shiriyazdanov 2011). For example, the regeneration of a zeolite-containing catalyst (ZCC) used for alkylation of isobutene with butane-butene fraction (BBF) in scCO 2 demonstrated that treatment of the alkylation catalyst in scCO 2 leads to restoration of its activity and selectivity to the level of the fresh catalyst (Shiriyazdanov 2011). In contrast to traditional coke thermo-oxidation at high temperatures, this method does not alter the morphological and structural characteristics of the catalyst grains.…”

Section: Olefin Alkylation Processmentioning

confidence: 99%

Ionic liquids and supercritical carbon dioxide: green and alternative reaction media for chemical processes

Liu

Zhang

et al. 2016

Reviews in Chemical Engineering

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Ionic liquids (ILs) and supercritical CO 2 (scCO 2 ) are two promising types of reaction media for green chemical processes due to their unique properties. They can be integrated into chemical reactions as catalysts and solvents to develop green and environment-friendly processes. This review presents current research trends aiming to solve the major chemical engineering issues in light of a fundamental understanding of these media. Applications of these media in the petrochemical industry, biochemical engineering, and fine chemical production are reviewed, suggesting the challenges and directions of utilizing them for green processes prospectively. These recent explorations and successful examples of applications demonstrate that ILs and scCO 2 offer huge potential for novel and green chemical engineering processes.

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“…Moreover, the regeneration of coked catalysts via reduction with H 2 was investigated (Chen 2003): the process was also performed at high temperatures (427°C and then 482°C for several hours), and results similar to the oxidative treatment were obtained. Other works (Shiriyazdanov 2011;Zhang, Zong, and Qiao 2009) carried out experiments with supercritical fluids due to their unique properties, such as a high dissolving power with respect to heavy organic substances (including coke precursors) and a low viscosity. They showed that high pressures allowed the regeneration of two different catalysts and a quite good restoration of their activity.…”

Section: Introductionmentioning

confidence: 99%

“…To a lesser extent, other regeneration processes have been developed. Among them, a way to regenerate coked catalysts consisted of burning their carbonaceous content in the presence of air or molecular oxygen-containing gas with the addition of an alcohol such as methanol or ethanol (Shimizu et al 1991).…”

Section: Introductionmentioning

confidence: 99%

Towards a New Oxidation Process Using Ozone to Regenerate Coked Catalysts

Richard

Julcour-Lebigue

Manero

2017

Ozone: Science & Engineering

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. ABSTRACTThis work focuses on the regeneration of a zeolite catalyst from industry deactivated by fouling with coke. To replace high temperature combustion, a common and energy intensive process, an oxidation process under milder conditions (50°C-200°C) has been investigated using ozone. Coked zeolite has been oxidized by an ozone stream in a fixed bed reactor, and regeneration kinetics was followed by analyzing carbon content of the particles and ozone concentration at the outlet. The effects of temperature, time on stream and ozone inlet concentration on carbon removal efficiency were studied. Moreover, elemental analysis showed that a maximum of 74.3% of carbon could be removed from the coked catalyst after 6.5 h. Moreover, the total specific surface area, the pore size distribution and the total pore volume (mainly mesopores) have been evaluated on coked and regenerated samples.

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Regeneration of zeolite-containing catalysts of alkylation of isobutane with the butane-butene faction in supercritical carbon dioxide

Cited by 13 publications

References 2 publications

Improving Plasma Regeneration Conditions of Pt–Sn/Al2O3 in Naphtha Catalytic Reforming Process Using Atmospheric DBD Plasma System

Improving Plasma Regeneration Conditions of Pt–Sn/Al2O3 in Naphtha Catalytic Reforming Process Using Atmospheric DBD Plasma System

Ionic liquids and supercritical carbon dioxide: green and alternative reaction media for chemical processes

Towards a New Oxidation Process Using Ozone to Regenerate Coked Catalysts

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