Abstract
IR spectroscopy of adsorbed probe molecules (CO, pyridine) is used to characterize the acidic properties of sulfated zirconia derived from zirconium oxide and hydroxide. Their acidic properties are found to be similar. The strength of the Lewis and Brönsted site measured by the frequency shift of adsorbed CO is lower than that in zeolites. It is concluded that sulfated zirconia have no superacid Brönsted and Lewis sites. Brönsted sites capable of protonating pyridine vanish when calcining the catalysts at temperature above 773 K, but the strength and concentration of the Lewis acid sites (LAS) do not change.
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Paukshtis, E., Shmachkova, V. & Kotsarenko, N. Acidic Properties of Sulfated Zirconia. Reaction Kinetics and Catalysis Letters 71, 385–391 (2000). https://doi.org/10.1023/A:1010304032536
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DOI: https://doi.org/10.1023/A:1010304032536