Novel supports for nickel-based catalysts for the partial oxidation of methane

Zirconia-supported nickel catalysts with different amounts of aluminum (Al/Zr = 0.2, 1 and 2) were studied in this work in order to find alternative supports for nickel-based catalysts for the partial oxidation of methane. This reaction is a promising route for producing hydrogen and syngas for diff...

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Bibliographic Details
Published in:	Catalysis today Vol. 149; no. 3; pp. 240 - 247
Main Authors:	Berrocal, Guillermo Paternina, Silva, Andre L. M. Da, Assaf, José M., Albornoz, Alberto, Rangel, Maria do Carmo
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Amsterdam Elsevier B.V 30-01-2010 Elsevier
Subjects:	Aluminum Catalysis Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Hydrogen Nickel Partial oxidation of methane Porous materials Syngas Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Zirconia Zirconia Nickel Hydrogen Aluminum Partial oxidation of methane Syngas Methane Binary compound Support Active site Selectivity Sustainable development Synthesis gas Supported catalyst Solid Chemical reduction Precipitation Carbon monoxide Catalytic reaction Deactivation Transition element compounds Transition metal Aluminium Conversion Partial oxidation Heterogeneous catalysis Impregnation Porosity Surface area Alumina Catalyst Environmental protection
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Summary:	Zirconia-supported nickel catalysts with different amounts of aluminum (Al/Zr = 0.2, 1 and 2) were studied in this work in order to find alternative supports for nickel-based catalysts for the partial oxidation of methane. This reaction is a promising route for producing hydrogen and syngas for different applications. Samples were prepared by precipitation and impregnation techniques, characterized by several techniques and evaluated in the partial oxidation of methane in the range of 450–750 °C and 1 atm. It was found that aluminum affects the textural and catalytic properties of zirconia-supported nickel catalysts. The tetragonal phase of zirconia was stabilized by aluminum and gamma-alumina was also found in the aluminum-richest samples. Aluminum increased the porosity and the specific surface area of the solids. The catalytic activity also increased with the amount of aluminum in solids probably due to the stronger interaction of nickel with the support, which slowly generates active sites during the reduction step. The methane conversion and hydrogen selectivity increased with temperature, indicating no deactivation. The hydrogen to carbon monoxide molar ratio decreased due to aluminum but was not significantly affected by temperature. The coke produced was not harmful to the catalysts and aluminum affected its amount, although no simple relationship was found between these parameters. The most promising catalyst was the sample with aluminum to zirconium molar ratio of 2, which showed high activity and hydrogen selectivity and was stable under the reaction condition.
ISSN:	0920-5861 1873-4308
DOI:	10.1016/j.cattod.2009.06.005