NDLI: Limits in the use of pyridine adsorption, as an analytical tool to test the surface acidity of oxidic systems. The case of sulfated zirconia catalysts

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Limits in the use of pyridine adsorption, as an analytical tool to test the surface acidity of oxidic systems. The case of sulfated zirconia catalysts

Content Provider	Springer Nature Link
Author	Morterra, C. Cerrato, G. Pinna, F. Meligrana, G.
Copyright Year	2001
Abstract	When high-area oxidic systems carry surface anionic species (in the present case: stable sulfate groups at the surface of sulfated zirconia catalysts), pyridine adsorption leads to an overestimated and thus partly artefact evaluation of the surface Lewis acidity. IR spectroscopic evidence is presented for the existence of a ligand competition at surface cationic centres (Lewis acid sites) between strong Lewis bases (pyridine) and surface sulfates. In the case of weak Lewis bases, like CO, there is no competition. The use of a “model” sulfated zirconia system, obtained by sulfation of an yttria-stabilized tetragonal zirconia preparation, turned out to be vital for obtaining the mentioned evidence, as this preparation allowed to compare the surface Lewis acidity in an homogeneous series of non-sulfated, sulfated, and sulfated-and-calcined systems of virtually unchanged crystal phase, surface area and crystal morphology. Also the conventional sulfated zirconia catalysts, prepared from an amorphous hydrate precursor, present the same type of surface ligand competition and the partly artefact evaluation of surface Lewis acidity, but in that case a piece of information is missing in that physical and chemical properties of the non-sulfated amorphous precursor cannot be compared with those of the crystalline sulfated systems.
Starting Page	53
Ending Page	61
Page Count	9
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	15
Issue Number	1
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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