Abstract
The properties of acid sites of ZrO2 and SO4/ZrO2-based systems modified by metal ions were studied by DRIFT spectroscopy using acetonitrile-d3 as a probe molecule. In the case of ZrO2. CD3CN interacts with the Lewis acid sites (LAS) with moderate strength. Adsorption on the Bronsted acid sites (BAS) is very weak, which indicates the absence of strong BAS on the surface of ZrO2. Modification of the surface by SO4 groups results in the appearance of a new type of BAS that are capable of adsorbing CD3CN in the polycoordinated form,i.e., stronger complexes with the adsorbate. Addition of metal ions (Fe, Ga, Zn, or Co) leads to the formation of a new type of LAS connected with Fe3+, Ga3+, Zn2+, and Co2+ promoter ions.
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