Partial oxidation of methane to syngas on bulk NiAl2O4 catalyst. Comparison with alumina supported nickel, platinum and rhodium catalysts
2012; Elsevier BV; Volume: 437-438; Linguagem: Inglês
10.1016/j.apcata.2012.06.014
ISSN1873-3875
AutoresRubén López‐Fonseca, Cristina Jiménez-González, Beatriz de Rivas, Jose Ignacio Gutiérrez-Ortiz,
Tópico(s)Catalysis and Oxidation Reactions
ResumoIn this work the catalytic performance of NiAl2O4 catalyst in the partial oxidation of methane (CH4(1)/O2(0.5)/N2(8.5) and 4800 mL CH4 g−1 h−1) was investigated. This bulk catalyst resulted more active (70% conversion at 625 °C) than alumina supported nickel catalysts prepared by conventional impregnation (11%Ni/Al2O3-30% conversion at 625 °C and 14%Ni/Al2O3-65% conversion at 625 °C) and a commercial platinum catalyst (1%Pt/Al2O3-30% conversion at 625 °C). Further, the behaviour of NiAl2O4 was comparable to that of a commercial rhodium catalyst (1%Rh/Al2O3-75% conversion at 625 °C). Fresh and spent catalysts were characterised by N2-physisorption, H2-TPR, UV-vis-DRS, WDXRF, XRD, TGA-MS, TEM and Raman spectroscopy. After catalyst reduction CH4 conversion over bulk NiAl2O4 was associated with the formation of large amounts of metallic nickel crystallites with a relatively small size. Although significant coking was noticed, conversion and selectivity to H2/CO were not significantly affected after prolonged time on stream.
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