Possibly, as reduction is normally made with hydrogen, then protons are the charge compensation cations, hence more protons more acid sites how acid are these protons depends on the Si/Al relation
Hello Roberto,
I think that there will be no clear/straight correlation between acidity and particle size. There are too many influencing parameters to find such an easy correlation.
At the one hand the zeolite itself influences the dispersion of the metal and on the other hand the different metals have different trends to form mono-, bi- or oligonuclear species. But the most influencing parameter will be the preparation method.
For example I have attached to papers. In one the different iron species, which could be formed in ZSM-5 are described. In the other one the influence of different framework types to cobalt-ions is described. There are a lot of papers regarding such issues.
Article Redox catalysis over metallo-zeolites: Contribution to envir...
Article Redox catalysis over metallo-zeolites
Article Physicochemical Characterization of Isomorphously Substitute...
There is two possibilities. Either it has to increase or decrease. The metals are lewis acid. They will pull the electron from proton. So it is easy to remove the proton from a solid acid. It is not clear that the lewis acidity is increasing or decreasing with particle size. Mostly it should increase with decrease in particle size. So with decrease in metal particle size, the acid strength increases.
Dear dr. Venkatathri,
Thank you very much for your useful response. Can you suggest me some papers involging this correlation?
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