Dielectric barrier discharge plasma treatment of catalysts and the effect on isomerised rice bran oil

Summary Dielectric barrier discharge (DBD) plasma is an emerging technology applied in multiple industries in recent years. In this work, DBD plasma was used instead of a traditional heating activation catalyst and applied in the field of rice bran oil (RBO) conjugation. Linoleic acid (LA) in rice bran oil generated a series of compounds with π‐double bonds at the basic site of the catalyst and finally shed with the catalyst to produce conjugated linoleic acid (CLA). Ru‐Pd/USY was prepared by the primary wet impregnation method, and Ru‐Pd/USY was treated at a power of 180 W, a discharge time of 150 s and an electrode spacing of 2.5 cm. The Ru‐Pd/USY morphology and internal composition were analysed by scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS). The catalyst was isomerised with RBO in a supercritical CO 2 environment, and the conversion of linoleic acid (LA) in Pd‐Ru/USY RBO after DBD treatment reached 67.4 ± 0.8%, and the finished oil met the edible standard.