AbstractOne of the main uses of catalysts in the oil industry is in the fluidized catalytic cracking process, which generates large quantities of waste material after use and regeneration cycles and that can be treated by the electrokinetic remediation technique, in which the contaminant metals are transported by migration. In this study, deactivated FCC catalyst was characterized before and after the electrokinetic remediation process to evaluate the amount of metal removed, and assess structural modifications, in order to indicate a possible use as an adsorbent material. The analyses included pH measurement and the concentration profile of vanadium ions along the reactor, X-ray microtomography, X-ray fluorescence, BET analysis and DTA analysis. The results indicated that 40% of the surface area of the material was recovered in relation to the disabled material, showing an increase in the available area for the adsorption. The remediation process removed nearly 31% of the vanadium and 72% of the P2O5 adhering to the surface of the catalyst, without causing structural or thermal stability changes.

Os novos campos offshore de produção de petróleo descobertos no Brasil encontram-se em camadas profundas com alta incidência de rochas carbonácea onde são geradas concentrações de CO2 até 12 vezes maiores que nos campos tradicionais. O CO2, em contato com a água produzida, dissocia-se na forma de ácido carboxílico originando um meio extremamente corrosivo ao açocarbono de baixa liga. Nestas condições, torna-se necessário um melhor entendimento da interação entre o aço e o CO2 de forma a ter-se uma melhor condição de controle da corrosão por CO2. Este trabalho visou o estudo de uma técnica de monitorização de corrosão provocada pela presença de ácido carbônico em sistemas submetidos a fluxo. O comportamento eletroquímico do açocarbono em meios contendo dióxido de carbono dissociado foi avaliado através da técnica de ruído eletroquímico. Os resultados obtidos mostraram que a técnica fornece taxas de corrosão sensíveis à condição de fluxo de eletrólito e de estabilidade das camadas de filme protetor possibilitando a sua aplicação para monitorização on-line.

The new offshore production of oil fields discovered in Brazil are in deep layers with high incidence of carbonate rocks in which CO2 concentrations generated are up to 12 times greater than in traditional fields. The CO2 in contact with produced water dissociates in the form of carboxylic acid generating an extremely corrosive to carbon steel and low alloy condition. Under this condition, it is necessary to better understand the interaction between steel and CO2 in order to get a better control condition of CO2 corrosion. This work aims to study a technique for monitoring corrosion caused by the presence of carbonic acid in systems undergoing flow. The electrochemical behavior of carbon steel in media containing dissociated carbon dioxide was evaluated by electrochemical noise technique. The results showed that the technique provides corrosion rates sensitive to electrolyte flow condition and stability of the layers of protective film allowing its application to on-line monitoring.