Characterization and Catalytic Performance of Niobic Acid Dispersed over Titanium Silicalite

Figure 7

FTIR spectra of the NBA, NBO, TS-1, and XNb/TS-1 samples after evacuation at 200^°C for 24 hours followed by pyridine adsorption at room temperature and evacuation at 150^°C for one hour, in the pyridine regions.