info:eu-repo/semantics/article
Ni mesostructured catalysts obtained from rice husk ashes by microwave-Assisted synthesis for CO2methanation
Fecha
2020-12Registro en:
Paviotti, María Aneley; Salazar Hoyos, Luis Alfonso; Busilacchio, Valentina; Faroldi, Betina María Cecilia; Cornaglia, Laura Maria; Ni mesostructured catalysts obtained from rice husk ashes by microwave-Assisted synthesis for CO2methanation; Elsevier; Journal of CO2 Utilization; 42; 12-2020; 1-12
2212-9820
CONICET Digital
CONICET
Autor
Paviotti, María Aneley
Salazar Hoyos, Luis Alfonso
Busilacchio, Valentina
Faroldi, Betina María Cecilia
Cornaglia, Laura Maria
Resumen
In this work, rice husk ashes were used to obtain a high purity silica precursor to synthesize mesoporous silica frameworks. A novel route for the synthesis of mesocellular silica foam (MCF) was developed using microwave irradiation during the hydrothermal treatment. Cyclohexane and cetyltrimethylammonium bromide were employed as swelling and structure-directing agents, respectively. Ni-based catalysts supported on MCM-41 and MCF mesostructured materials were obtained using two methods, one-pot and incipient wetness impregnation. The catalysts prepared for both methods presented noticeable differences in the metal-support interaction, which were observed by TEM, SAXRD, TPR and XPS. The impregnated catalysts showed preferentially Ni particles inside the pore structure of the support while the one-pot catalysts also showed Ni particles within the silica framework. The catalysts were evaluated in the CO2 methanation reaction between 200 and 500 °C at atmospheric pressure. The samples prepared by impregnation showed better catalytic performance than those prepared by the one-pot method. Thereby, the Ni particles highly distributed within the pore improved the CO2 methanation reaction. The Ni/MCF_ch_iwi presented the best catalytic performance reaching CO2 conversions and CH4 selectivities close to the reaction equilibrium, from 350 to 500 °C. The Ni/MCF_ch_iwi also showed high structure and catalytic stability, as well as coke resistance formation under reaction conditions.