Abstract
The dynamic behavior of adsorbed pyridine and the sulfate group has been studied over sulfated zirconia (SZ) and Pt-promoted sulfated zirconia (Pt/SZ) by in situ infrared (IR) spectroscopy coupled with mass spectrometry (MS). IR analysis confirmed that pretreating SZ in flowing He at 500 °C led to the formation of SO species. Pyridine adsorption caused desorption of sulfur in the form of SO 3. IR and MS analyses coupled with a temperature-programmed desorption (TPD) study confirmed that pyridine adsorbed onto the Lewis acid sites was oxidized to CO 2 while the pyridine–Brønsted acid site complexes showed little desorption or oxidation. Addition of Pt onto sulfated zirconia led to enhanced Brønsted acidity when treated with H 2; higher loading of Pt led to decreased thermal stability of the sulfate group, promoting desorption of SO 2 during the TPD. This is the first report that presents dynamic analyses of pyridine adsorption/desorption phenomena over sulfated zirconia samples.
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