Mössbauer emission and absorption studies on the reduction behaviour of supported Co, Co−Mo, Fe and Fe−Mo hydrotreating catalysts
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In carbon-supported Fe−Mo catalysts an Fe−Mo alloy can be formed during reduction in H2 at 673 K. In carbon-supported Co−Mo catalysts, instead of the formation of a Co−Mo alloy segregation of metallic Co is observed.
In alumina-supported Fe and Fe−Mo catalysts, the interaction between the alumina support and the catalyst particles hinders reduction of the ions to an Fe0 phase. Most probably a surface “Fe(II)-aluminate” is formed.
KeywordsAlumina Thin Film Catalyst Particle Absorption Study Hydrotreating
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