Avaliação do uso de peneiras moleculares do tipo MCM-41 impregnadas com aminas para remoção de CO2

Abstract

Carbon dioxide accounts for 90% of the greenhouse gases emitted in Brazil. Emissions associated with oil and natural gas include CO2 leakage during the production chain, refining products, and the burning of fossil fuels for energy generation, which accounts for 90% of the emissions in a refinery only. Mesoporous materials impregnated with amines have become very attractive in the scientific environment due to their facilitating characteristics of CO2 capture. Hence, the mesoporous material MCM-41 was synthesized and subsequently impregnated with pentaethylenehexamine (PEHA) to be evaluated as a support for CO2 adsorption. Its characterization involved analyzes of XRD, FT-IR, TG / DTG and BET to confirm its structural properties. To measure the adsorption capacity of CO2, a microadhesive coupled to a magnetic suspension was used to generate experimental adsorption isotherms. MCM-41 obtained the highest maximum capture capacity of 11.99 mmol / gads and a favorable isotherm for use in cyclic processes. The amine-impregnated supports obtained lower capture capacity because, despite being controlled by the kinetics of the reaction, at low temperatures of 25ºC the high agglomeration of the amine bulky groups made difficult the access of the CO2 molecules to the active sites. However, its isotherms proved to be suitable for use in processes operated under high pressures