... (Nd2O3), potassiumhydroxide (KOH), potassium iodide (KI), potassium bromate(KBrO3), potassium hydrogen phthalate (C8H5O4K) and potas-sium nitrate (KNO3) were obtained from Sinopharm ... mufflefor12hat600C.Afterimpregnation,thecatalysts weredried for1 2hat 100C andthenthe solid was calcinedinamufflefurnace at designed temperature for 12 h before use for thereaction.2.3. Characterization of ... vegetable oils using the heterogeneousWO3/ZrO2catalyst for production of biodiesel. BioresourTechnol 2010;101:S59e61.[10] Lou WY, Zong MH, Duan ZQ. Efficient production of biodiesel from high...