I have obtained samples with ferromagnetic behavior (presence of Ni predominantly in the metallic state over the alumina surface) and paramagnetic (in which Ni is oxidized in NiO form is alumina surface) and, coincidentally or not, ferromagnetic samples seems to show greater interaction (stronger "bond") between Ni and Al2O3 than paramagnetic samples.
Is there any relationship between the magnetic behavior of the active phase of the catalyst (in my case, Ni) and its interaction with the oxide support used?
The interaction oof Ni with the Al2O3 depends a lot of the synthesis method, if there was calcination at high temperature for large time, it could form chemical interaction, this is a new solid-phase of Ni-Al2O3 and also depends on the type of atmosphere used.
Thanks for your considerations Mr. Javier Rivera De la Rosa
Dear MSc. Santos,
A few studies are available in the literature dealing with the magnetic behavior of some materials and their properties in particular systems. I have been working with catalysis, and the performance depends on the magnetization of different materials. Also, the interaction of oxides (e.g. silica and SrO) with the magnetic materials is different, which usually is designated as metal-support interaction. Unfortunately, I feel that there is some resistance in dealing with it in the literature. I have tried to discuss such phenomena in articles, but the reviewers advised not to include such discussion due to the difficulty of getting a final relationship. Anyway, this question is worthy of being studied. So, based on my experience, I believe you should use techniques as XPS and TPR to try to get some more information. Good luck!
Thank you very much Professor Marco Aurélio Suller Garcia
I share the same feeling as you.
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