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Optimal compositional and structural design of a LaMnO3/ZrO2/Pd-based catalyst for methane combustion

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Title: Optimal compositional and structural design of a LaMnO3/ZrO2/Pd-based catalyst for methane combustion
Authors: Civera, A.1, Negro, G.1, Specchia, S. stefania.specchia@polito.it, Saracco, G.1, Specchia, V.1
Source: Catalysis Today. Feb2005, Vol. 100 Issue 3/4, p275-281. 7p.
Subjects: Perovskite, Oxide minerals, Palladium, Catalysts
Abstract: Abstract: The aim of this work was to identify the optimum synthesis conditions and the most effective technique for noble metal deposition in a perovskite/palladium-based catalyst for natural gas combustion. The solution combustion synthesis (SCS) of perovskite/zirconia-based materials was investigated, by starting from metal nitrates/glycine mixtures. Characterization and catalytic activity tests were performed on as-prepared powders and then repeated after calcination for 2h at 900°C in calm air. Calcination appeared to be beneficial in that, despite lowering the specific surface area, it promoted the simultaneous crystallization of both LaMnO3 and ZrO2 and the half-conversion temperature (T 50), regarded as an index of catalytic activity, was lowered. Two phases, both active towards methane oxidation – lanthanum manganate and palladium oxide – were combined so as to evaluate their synergism in terms of catalytic activity. Pd was therefore added either via incipient wetness impregnation on LaMnO3·2ZrO2 or through a one-step SCS-based route. Characterization and catalytic activity tests followed suit. Optimal composition and preparation routes were found: T 50 was lowered from 507°C – pure LaMnO3 prepared via SCS – to 432°C attained with a 2% (w/w) Pd load on pre-calcined LaMnO3·2ZrO2. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: The aim of this work was to identify the optimum synthesis conditions and the most effective technique for noble metal deposition in a perovskite/palladium-based catalyst for natural gas combustion. The solution combustion synthesis (SCS) of perovskite/zirconia-based materials was investigated, by starting from metal nitrates/glycine mixtures. Characterization and catalytic activity tests were performed on as-prepared powders and then repeated after calcination for 2h at 900°C in calm air. Calcination appeared to be beneficial in that, despite lowering the specific surface area, it promoted the simultaneous crystallization of both LaMnO3 and ZrO2 and the half-conversion temperature (T 50), regarded as an index of catalytic activity, was lowered. Two phases, both active towards methane oxidation – lanthanum manganate and palladium oxide – were combined so as to evaluate their synergism in terms of catalytic activity. Pd was therefore added either via incipient wetness impregnation on LaMnO3·2ZrO2 or through a one-step SCS-based route. Characterization and catalytic activity tests followed suit. Optimal composition and preparation routes were found: T 50 was lowered from 507°C – pure LaMnO3 prepared via SCS – to 432°C attained with a 2% (w/w) Pd load on pre-calcined LaMnO3·2ZrO2. [Copyright &y& Elsevier]
ISSN:09205861
DOI:10.1016/j.cattod.2004.09.062