Fig. 5From: Effect of Extra-Framework Cations of LTL Nanozeolites to Inhibit Oil Oxidation(a) Colorimetry study on palm oil samples as a function of oxidation time. The measurement was recorded at a wavelength of 530 nm. (b) Total acid number (TAN) and (c) viscosity of oil samples after 400 h of oxidation treatment at 150 °CBack to article page