Ni-supported catalysts for ethanol steam reforming: effect of the solvent and metallic precursor in catalyst preparation

International Journal of Industrial Chemistry

دوره 9، شماره 1، خرداد 2018، صفحه 61-73

نوع مقاله: research article

شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-018-0135-6

نویسندگان

Alejandra C. Villagrán Olivares؛ Manuel F. Gomez؛ Mariana N. Barroso؛ María C. Abello^*

Instituto de Investigaciones en Tecnología Química, INTEQUI-CONICET-UNSL, Almirante Brown 1455, 5700, San Luis, Argentina

چکیده

Ethanol steam reforming was studied over Ni/MgAl₂O₄–CeO₂ catalysts. The catalysts were prepared using different impregnation media (ethanol or water) and Ni precursors (nitrate or acetate). The use of an alcoholic solution did not affect the specific surface area, but promoted the NiO formation reducible at lower temperature affecting the Ni-support interactions and the Ce³⁺/Ce⁴⁺ initial ratios. All catalysts were highly active in the reforming reaction of ethanol with a high initial conversion of ethanol under more severe conditions than those commonly used in literature. The best catalytic behavior was found over the catalyst prepared from an ethanolic solution of Ni(NO₃)₂. This sample showed a high Ce³⁺/Ce⁴⁺ ratio, an adequate interaction Ni-support and an average Ni diameter around 28 nm. This catalyst was stable under the reforming conditions used in this work: initial ethanol concentration: 9.4%, reaction temperature: 650 °C, W/F = 49 g min mol−1C2H5OH and reaction time: 40 h. The ethanol conversion was almost complete with H₂ selectivity around 78%.

کلیدواژه‌ها

Hydrogen · Ethanol reforming · Ni/MgAl2O4؛ CeO2 catalysts · Deactivation