Coprecipitated nickel-alumina catalysts for methanation at high temperature. Part 2. - Variation of total and metallic areas as a function of sample composition and method of pretreatment
Author
dc.contributor.author
Alzamora, Luis E.
Author
dc.contributor.author
Ross, Julian R.H.
Author
dc.contributor.author
Kruissink, Edgar C.
Author
dc.contributor.author
Van Reijen, Louis L.
Admission date
dc.date.accessioned
2018-12-20T14:35:51Z
Available date
dc.date.available
2018-12-20T14:35:51Z
Publication date
dc.date.issued
1981
Cita de ítem
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Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, Volumen 77, Issue 3, 2018, Pages 665-681
Identifier
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03009599
Identifier
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10.1039/F19817700665
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/156602
Abstract
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Results are presented for the total and metallic nickel areas of a series of coprecipitated nickel-alumina catalysts prepared and pretreated in different ways. The total areas of the samples decrease on reduction and with increasing reduction temperature, while the nickel area increases with reduction temperature. Increasing calcination temperature causes a decrease in total and nickel areas, this being particularly marked at high temperatures of calcination. A model for the catalyst system is proposed, based on these results and on complementary structural investigations. The high stability of the catalysts is attributed to the presence in the unreduced catalyst of nickel oxide rich phases containing dissolved aluminium ions; on reduction, alumina crystallises on the surface of the growing nickel crystallites, preventing sintering of the catalysts except under extreme conditions.
Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
Keywords
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Chemistry (all)
Título
dc.title
Coprecipitated nickel-alumina catalysts for methanation at high temperature. Part 2. - Variation of total and metallic areas as a function of sample composition and method of pretreatment