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Vanadium-lithium Alumina A Potential Additive For Coke Oxidation By CO2 In The Presence Of O2 During FCC Catalyst Regeneration

Sérgio Castro Pereira, Sérgio Castro Pereira, Sérgio Castro Pereira, Filipa Franco, Filipa Franco, Filipa Ribeiro, Nuno Batalha, M. M. Pereira, M. M. Pereira
Published 2016 · Materials Science

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Abstract The possibility of performing the regeneration of spent fluid catalytic cracking catalysts in rich CO 2 atmosphere can simultaneously reduce greenhouse gas emissions and produce CO for sequential uses. Herein alumina modified by vanadium and lithium was revealed a remarkable catalyst (or additive) for this goal. High CO 2 conversion was observed in the presence of helium (for instance at 720 and 800 °C, 39 and 76% of CO 2 was converted during the first 5 min of reaction respectively) and it was reduced by less than 5% in the presence of oxygen. Moreover the catalyst works effectively regardless the coke type on spent catalyst, i.e. produced by means of hydrocarbon or bio feed cracking. This catalyst was tested as an additive and works properly up to one part to ten of spent USY. By means of either labeled CO 2 or coke (both with carbon 13) it was shown that primary 13 CO 2 forms 13 CO followed by oxygen mobility between alumina and USY promoting coke oxidation. 12 CO 2 formed in-situ similarly to 13 CO 2 readily reacts with coke producing CO. These effects improve the coke burning by CO 2 and remarkably increase the CO/CO 2 ratio even in the presence of O 2 . Finally these results strongly support that the FCC regeneration step can be kept under auto-thermal condition in CO 2 rich atmosphere.
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