Supercritical CO2‐assisted Ru‐Pd/USY synchronised isomerisation to produce rice bran oil rich in conjugated linoleic acid

Summary In this work, the catalytic efficiency and influencing factors of supported bimetallic catalysts for the synchronised isomerisation of rice bran oil (RBO) to produce conjugated linoleic acid (CLA)‐rich RBO under supercritical conditions were investigated. The morphology and internal composition of the metal catalysts were analysed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), which revealed that Ru and Pd were successfully supported by ultra‐stable Y(USY). The catalyst and oil were synchronously isomerised in the supercritical CO2 environment, and the change in the fatty acid composition of the oil was measured by gas chromatography. The results showed that when the CO2 pressure was 8.0 MPa, the catalyst addition was 5% and the reaction temperature was 160 °C, the conversion of linoleic acid in the RBO catalysed by Ru‐Pd/USY was 68.25 ± 0.08%, and the produced oil met the edible standard. Schematic diagram of supercritical assisted Ru‐Pd/USY simultaneous isomerization process.