Fig. 3. γ-Stearolactone (GSL) ring-opening activities of the different (a) zeolite Y and (b) zeolite beta materials under study, as summarized in Table 1. The elapsed time before the dashed line (t = 0 h) is the time needed to heat from room temperature to the final temperature of 230 °C. (c) Calculated total acidity (μmol g−1) and Brønsted acid site to Lewis acid site (BAS/LAS) ratios of the zeolite materials as probed by pyridine in combination with Fourier transform-infrared (FT-IR) spectroscopy. The sample symbols have been adapted so that the area of each symbol is proportional to the GSL conversion up to when the target temperature of 230 °C (t = 0 h) was reached.
