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

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 CO sub(2) desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 17; no. 4; pp. 1047 - 1055
Main Authors Souza, Guilherme de, Marcilio, Nilson Romeu, Perez-Lopez, Oscar William
Format Journal Article
LanguageEnglish
Portuguese
Spanish
Published ABM, ABC, ABPol 01.07.2014
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
Carbon
carbon deposition
Carbon dioxide
Catalysis
Catalysts
Co-based catalyst
Coprecipitation
Dry reforming of methane
Drying
ENGINEERING, CHEMICAL
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Methane
mixed oxide
precipitation method
Reforming
Co-based catalyst
mixed oxide
Dry reforming of methane
carbon deposition
precipitation method
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Summary: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 CO sub(2) desorption, specific area and X-ray diffraction were utilised for characterisation. Activity tests were conducted at atmospheric pressure, temperatures between 400-550[degrees]C , CH sub(4)/CO sub(2) molar ratio of 1 and GHSV of 6000 NmL CH sub(4)[middot]g super(-1)[middot]h super(-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.
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ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1516-1439.269614