Model CO2 gasification reactions on uncatalyzed and potassium catalyzed glassy carbon surfaces

Kelemen, S.R.; Freund, Howard

doi:10.1016/0021-9517(86)90142-9

Cited by 28 publications

(11 citation statements)

References 23 publications

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“…The coke oxidation under CO 2 atmosphere occurs at considerably higher temperatures than under O 2 . This phenomenon is related to the higher reactivity of O 2 for oxidation . The CO profiles obtained for Na/Al 2 O 3 and Ca/Al 2 O 3 catalysts clearly show that both sodium and calcium can promote RB reaction due to the CO occurrence at lower temperatures compared to pristine alumina.…”

Section: Resultsmentioning

confidence: 88%

“…The activation energy required for coke oxidation was reduced from 349 kJ.mol −1 on alumina to 249 kJ.mol −1 on alumina with potassium, and to 192 kJ.mol −1 on alumina with both potassium and vanadium . Since O 2 oxidation reactivity is two orders of magnitude higher than CO 2 , the principal goal of this approach is to overcome this difference . Thus, the regeneration of a spent FCC catalyst could be maintained under autothermic conditions.…”

Section: Introductionmentioning

confidence: 99%

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Catalyst regeneration using CO₂ as reactant through reverse‐Boudouard reaction with coke

et al. 2017

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The possibility of CO2 recycling into standard refinery can largely mitigate greenhouse gas emissions. It was previously demonstrated that alumina modified by either potassium or lithium in the presence of vanadium was able to promote the reaction of CO2 with coke in the presence of O2 during the regeneration step of a spent catalyst. Herein, vanadium‐sodium and vanadium‐calcium on alumina were used to achieve that reaction. These catalysts showed slightly lower conversion compared to previously catalysts. However, regardless of the type of group I and II elements, all catalysts showed very similar apparent activation energy (Eaapp) for the coke oxidation with CO2 reaction (CO2+coketo2.6pc→EaappCO+coke−O), i.e., in the range of 188–193 kJ.mol−1. In contrast without vanadium, Eaapp was in the range of 242–253 kJ.mol−1. Therefore, CO2 is activated in a site composed of V‐O‐(group I or II) in the coke proximity. Moreover, these results clearly support that vanadium plays the main role in the type of activation complex, independently of the group I and II metal used and most probably in the dissociative step of CO2. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Catalyst regeneration using CO₂ as reactant through reverse‐Boudouard reaction with coke

et al. 2017

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“…92-150 kJ/mol for Fe [19], and ca. 297 kJ/mol for K [20]. The activation energy may strongly be influenced not only by the kind of catalyst but also by the contact degree between carbon and catalyst, as discussed above.…”

Section: Resultsmentioning

confidence: 97%

Kinetics of the reverse-Boudouard reaction over supported nickel catalysts

Osaki

Mori

2006

React Kinet Catal Lett

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A new method determining the specific rate with no information about the number of active sites was applied to the reverse-Boudourad reaction over supported Ni catalysts. It was found that the catalyst support hardly affected the specific rate. The activity pattern and activation energies agreed well with those obtained by a conventional method using TG, suggesting the validity of the new method for studying the kinetics.

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“…Kelemen et al, 1986), sendo este um importante resultado, já que o mesmo efeito é visto quando se introduz potássio com alumina. Como o vanádio está localizado sobre o potássio (R.P.…”

Section: Resultados E Discussõesunclassified

Catalisador De Vanádio-Potássio-Alumina: Uma Forma De Promover a Reação De Co2 E Coque Na Presença De O2 Durante a Regeneração Do Catalisador De FCC

Marques¹,

Silva²,

Santos³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -O processo de craqueamento catalítico em leito fluidizado (FCC) é responsável por cerca de 30% das emissões de CO 2 na refinaria. Tendo essa perspectiva, a proposta deste trabalho é estudar a possibilidade de queima do coque em atmosfera CO 2 /O 2 ao invés de ar como é correntemente utilizado na refinaria. A reação do CO 2 com o coque pode ser muito relevante, pois simultaneamente minimizaria as emissões e ainda produziria como produto o CO, que é uma molécula estratégica do ponto de vista industrial. Os resultados mostraram que os catalisadores de alumina contendo potássio e vanádio são potenciais para a reação do CO 2 com o coque, pois permitiram realizar esta reação com grande conversão e ainda na presença de oxigênio. Foi claramente mostrado uma sinergia entre potássio e vanádio. Desta forma, os resultados demonstraram que na etapa de regeneração do catalisador, o equilíbrio térmico pode ser mantido, assim como possibilita produção de CO, quanto mitigação de CO 2 .

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Model CO2 gasification reactions on uncatalyzed and potassium catalyzed glassy carbon surfaces

Cited by 28 publications

References 23 publications

Catalyst regeneration using CO₂ as reactant through reverse‐Boudouard reaction with coke

Catalyst regeneration using CO₂ as reactant through reverse‐Boudouard reaction with coke

Kinetics of the reverse-Boudouard reaction over supported nickel catalysts

Catalisador De Vanádio-Potássio-Alumina: Uma Forma De Promover a Reação De Co2 E Coque Na Presença De O2 Durante a Regeneração Do Catalisador De FCC

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Model CO2 gasification reactions on uncatalyzed and potassium catalyzed glassy carbon surfaces

Cited by 28 publications

References 23 publications

Catalyst regeneration using CO2 as reactant through reverse‐Boudouard reaction with coke

Catalyst regeneration using CO2 as reactant through reverse‐Boudouard reaction with coke

Kinetics of the reverse-Boudouard reaction over supported nickel catalysts

Catalisador De Vanádio-Potássio-Alumina: Uma Forma De Promover a Reação De Co2 E Coque Na Presença De O2 Durante a Regeneração Do Catalisador De FCC

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Catalyst regeneration using CO₂ as reactant through reverse‐Boudouard reaction with coke

Catalyst regeneration using CO₂ as reactant through reverse‐Boudouard reaction with coke