Abstract
In this work, the catalytic performance of Ni supported on ceria doped with Zr, Pr and Nb used as anodes for solid oxide fuel cell (SOFC) operating directly on fuels containing methane and CO2 was studied. The anodes were prepared by a hydrothermal method using a Ni content (14 vol%) lower than that of a conventional SOFC anodes (30 vol%). The materials obtained were characterized by X-ray diffraction, temperature-programmed reduction, Raman spectroscopy and thermogravimetric analyses. The results showed that the sample containing Zr exhibited the lowest Ni crystallite size, which led to a high initial activity on dry reforming of methane at 1073 K. However, the Ni/CePr catalyst showed the lowest carbon formation. This was attributed to the higher oxygen mobility of CePr support that promotes the carbon removal mechanism.
Highlights
The solid oxide fuel cells (SOFC) technology has been considered as an attractive energy conversion system
The aim of this work is to study the catalytic performance of Ni supported on ceria doped with Zr, Pr and Nb as anodes for SOFC operating directly on methane and CO2
The supports calcined at 1073 K exhibited low surface areas (CeZr: 39 m2 g-1; CePr: 18 m2 g-1 e CeNb: 22 m2 g-1). These values are higher than that obtained by Augusto et al.[29] for gadolinium-doped ceria support prepared by the same procedure used in this work
Summary
The solid oxide fuel cells (SOFC) technology has been considered as an attractive energy conversion system. It has several advantages such as high efficiency, relatively low sensitivity to impurities, and possibility for operation with an internal reformer.[1,2] In the case of the direct internal reforming solid oxide fuel cell (DIR-SOFC), the complexity and costs of the fuel cell system are reduced, since the available fuels (hydrocarbons or alcohols) can be fed straight to the anode side of SOFC and reformed to. The associated gas produced in the world’s largest deepwater field in Brazil contains a significant amount of carbon dioxide that has to be removed before its use. In the case of biogas or landfill gas (LFG), this gaseous mixture containing, mainly methane and carbon dioxide, is produced by anaerobic digestion or fermentation of organic matter
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