The possibility of supercritical fluid regeneration for Pt-Re/γ-Al2O3 industrial reforming catalyst in O3/CO2 mixtures

Gaydamaka, S. N.; Timofeev, V. V.; Lemenovskii, D. A.; Кардашев, С. В.; Паренаго, О. О.; Баграташвили, В. Н.; Sergienko, S. A.; Brusova, G. P.; Лунин, В. В.

doi:10.1134/s2070050413030033

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…For example, Gaydamaka et al showed the possibility of supercritical fluid regeneration for Pt-Re/ Al 2 O 3 industrial reforming catalyst in O 3 /CO 2 mixtures. In the mentioned study, the results demonstrated the possibility of burning out the coke from the active surface of the deactivated catalysts with ozone dissolved in a supercritical fluid; high pressure of about 15-18 MPa was a difficult operating condition in the regeneration process, though [13].…”

Section: Introductionmentioning

confidence: 95%

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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: 95%

“…Another widely used method for catalyst regeneration is supercritical fluid extraction (SFE) [10][11][12]. In this method, high pressure used for catalyst regeneration makes some problems like difficulty in experimental set-up and may collapse the internal structure of the catalysts.…”

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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“…However, considerable deposits of organic impurities on the surface of the catalysts arriving on utilization block hydrochemical processes. The organic deposits which are from 5 to 20% of the mass of the carrier material, consist generally of the multicondensed aromatic compounds with high molecular weight, with a low ratio of H/C and high temperature of their oxidation (500-600 ºС) [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Engineering Process of Reforming Dead Catalysts for the Extraction of Platinum Group Metals

Вострикова

Кравцова

Vostrikova

2020

MSF

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The analysis of the engineering process of reforming dead catalysts for the extraction of platinum group metals has been carried out. Fully-dead catalyst, having passed several cycles of regeneration and entitled to utilization, has the considerable carbonaceous deposits, both on external and internal surfaces. Their content averages 5.0% of the mass of the catalyst. The research objectively consisted in selection of the sweet roasting modes, promoting the fullest removal of the dense carbonaceous deposits from the surface of the dead platinum-rhenium catalysts. The kinetics research of carbonaceous removal deposits from the surface of the catalyst was carried out in a pipe-still heater; oxygen content, duration and temperature of sweet roasting being varied. The maximum temperature during the research reached 950°C, the maximum duration of isothermal holding didn't exceed 6 hours. The extent of carbonaceous deposits removal was calculated by changing sample weight. The kinetic curves were approximated by high-order polynomials, which made it possible to obtain a diagram, illustrating the degree of organic deposits removal, depending on temperature and firing time. It is shown that in the environment enriched to 30-35 vol. % oxygen, the engineering process of catalysts for regeneration is possible to be carried out at 650 °C, with holding for 2 hours at a specified temperature. The alternative of sweet roasting is the air blowing of dead catalysts at temperature of 800 °C within an hour. Both modes guarantee the complete removal of the dense carbonaceous deposits from the surface of the dead catalyst.

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“…Однако гидрохимическим процессам препятствуют значительные отложения органических примесей на поверхности поступающих на утилизацию катализаторов. Составляющие от 5 до 20 % от массы самого носителя органические отложения, состоят в основном из поликонденсированных ароматических соединений с большой молекулярной массой, с низким соотношением H/C и высокой температурой их окисления (500-600 ºС) [5 ]. * Статья публикуется по рекомендации программного комитета Международной научно-практической конференции "Материаловедение и металлургические технологии" (RusMetalCon-2019), https://rusmetalcon.susu.ru Так, по данным [6], основной причиной, затрудняющий извлечение Pt и Pd из отработанных катализаторов нефтехимических процессов, является их высокая закоксованность.…”

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Analysis of the Engineering Process of Reforming Dead Ccatalysts for the Extraction of Platinum Group Metals

2019

RIJIE

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Вострикова Ю.В. Национальный исследовательский университет нефти и газа им. И. М. Губкина, г. Москва, Российская Федерация Аннотация. Изучен процесс подготовки дезактивированных катализаторов риформинга к извлечению металлов платиновой группы. Полностью отработанный, прошедший несколько циклов регенерации и подлежащий утилизации катализатор, как на внешней, так и на внутренней поверхности, имеет значительные углеродистые отложения. Их содержание составляет в среднем 5,0 % от массы катализатора. Цель исследования состояла в подборе режимов окислительного обжига, способствующего наиболее полному удалению плотных углеродистых отложений с поверхности отработанных платинорениевых катализаторов. Исследование кинетики удаления углеродистых отложений с поверхности катализатора проводили в трубчатой печи, при варьировании содержания кислорода, продолжительности и температуры окислительного обжига. Верхний предел температуры при исследовании достигал 950 °С , максимальная продолжительность изотермической выдержки не превышала 6 часов. Степень удаления углеродистых отложений рассчитывали по изменению массы навески. Кинетические кривые были аппроксимированы полиномами высоких порядков, что позволило получить диаграмму, иллюстрирующую степень удаления органических отложений в зависимости от температуры и времени обжига. Показано, что в среде, обогащенной до 30-35 об. % кислородом, процесс подготовки катализаторов к регенерации можно вести при 650 °С , с выдержкой при указанной температуре в течение 2 ч. Альтернативным вариантом окислительного обжига является продувка отработанных катализаторов воздухом при температуре 800 °С в течении одного часа. Оба режима гарантируют полное удаление плотных углеродистых отложений с поверхности отработанного катализатора. Ключевые слова: платинорениевый катализатор, каталитический риформинг, регенерация, окислительный обжиг, углеродистые отложения.

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The possibility of supercritical fluid regeneration for Pt-Re/γ-Al2O3 industrial reforming catalyst in O3/CO2 mixtures

Cited by 7 publications

References 7 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

Analysis of the Engineering Process of Reforming Dead Catalysts for the Extraction of Platinum Group Metals

Analysis of the Engineering Process of Reforming Dead Ccatalysts for the Extraction of Platinum Group Metals

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