Catalisadores de Ni suportado em MgAl2O4 para reforma a seco do metano: efeito da rota de síntese por combustão nas propriedades catalíticas

Abstract

In recent years, the world’s energy demand has been increasing rapidly and oil is the main energy source of this matrix. However, because it is a limited and polluting resource, several studies are focused on finding a source that can replace the current one. Thus, hydrogen emerges as an alternative source of clean, renewable energy and high energy efficiency. This work evaluates the synthesis method and its influence on the preparation of catalysts for the methane dry reforming process which supplies H2 as one of the products. The catalysts used in the reform were synthesized via microwave assisted combustion using urea as a fuel with a concentration of 25 and 200% of the stoichiometric value; For two of the prepared materials the active phase was incorporated via the one-pot method and for the other two materials the impregnation method was used to incorporate nickel for two of these catalysts. The characterization of the synthesized materials was made by X-ray diffraction (XRD), surface area (BET), scanning electron microscopy (SEM) and programmed thermal reduction (TPR). The catalyst made by the low urea impregnation method showed a high catalytic stability, while the material synthesized by the high fuel one-pot method without calcination showed a high reactivity. The results obtained with the methane and carbon dioxide conversions were quite promising, mainly for Ni MgAl (IBT) and Ni-MgAl (OAT), where conversions were obtained around 90% after 12h of reaction and at 800 ° C operating temperature.