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Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

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Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts

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Título Dry reforming of methane at moderate temperatures over modified Co-Al Co-precipitated catalysts
Autor Souza, Guilherme de
Marcilio, Nilson Romeu
Pérez Lopez, Oscar William
Abstract M-Co-Al (M = Ca, La, Li or Mg) materials were synthesised by co-precipitation and investigated for dry reforming of methane. Thermogravimetry, temperature-programmed oxidation, reduction and CO2 desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-550°C , CH4/CO2 molar ratio of 1 and GHSV of 6000 NmL CH4·g–1·h–1. The partial substitution of Co by a third element increased the area and changed the acid/base properties, reducibility and crystallinity of the oxides. These modifications resulted in higher activity for dry reforming of methane, mainly related to the decrease in the acidity of the promoted materials and, consequently, lower carbon formation. The Li‑modified sample presented the lowest coke deposition due to the increase in stronger basic sites. The Mg-promoted catalyst exhibited the best activity performance. This depicts the enhancement in the reducibility and acid/base properties found in the MgCoAl sample.
Contido em Materials research : ibero-american journal of materials. São Carlos. Vol. 17, n. 4 (July/Aug. 2014), p. 1047-1055
Assunto Catalise
Metano
Óxidos mistos
[en] Carbon deposition
[en] Co-based catalyst
[en] Dry reforming of methane
[en] Mixed oxides
[en] Precipitation method
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/115525
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