Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 395, Issue -, Pages 108-116Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2014.08.019
Keywords
Methane; Tri-reforming; Dry reforming; Nickel; Supports
Categories
Funding
- University of Castilla-La Mancha [PEID 5-3]
- Consejeria de Ciencia y Tecnologia of the Junta de Comunidades de Castilla-La Mancha [PPII10-0045-5875]
- Spanish Government [FPU AP2009-2948]
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The influence of different support materials (alumina, ceria, beta-silicon carbide and yttria-stabilized zirconia) on the catalytic behaviour of Ni catalysts for the dry reforming reaction and the tri-reforming process has been studied. The influence on the catalytic performance of the composition of the atmosphere surrounding the Ni/YSZ catalyst during the calcination step was also analysed. Temperature-programmed reduction experiments showed remarkable differences in the reduction profile and the degree of reduction of the catalysts as a function of both the support used and the calcination conditions. Ni/YSZ-O-2, the catalyst calcined under an oxygen-poor atmosphere, presented a higher reducibility as a consequence of the higher number of oxygen vacancies in the surface of the support. The Ni/Al2O3 catalyst gave the lowest CH4 and CO2 reaction rates as a consequence of its low reducibility due to the formation of Ni aluminate. The Ni/CeO2 catalyst showed the lowest H-2/CO molar ratio for the tri-reforming process. This result can be explained on considering the higher basicity of this catalyst, as shown by CO2-TPD experiments. The CeO2 and beta-SiC catalysts had the best characteristics as catalytic supports for the tri-reforming process. (C) 2014 Elsevier B.V. All rights reserved.
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