Abstract ▼ AI-Helper

In this study, conjugated linoleic acid methyl ester was synthesized through isomerization of linoleic acid methyl ester by using homogeneous/heterogeneous catalysts. As homogeneous catalyst, potassium methoxide was used and with use of autoclave, reaction for 12 hours at 175℃ was made. As a result,...

In this study, conjugated linoleic acid methyl ester was synthesized through isomerization of linoleic acid methyl ester by using homogeneous/heterogeneous catalysts. As homogeneous catalyst, potassium methoxide was used and with use of autoclave, reaction for 12 hours at 175℃ was made. As a result, the conjugation yield was recorded at 99.0%. As for heterogeneous catalysts, Ni supported zeolite type catalysts were used. HY zeolites were ion exchanged with KCl aqueous solution to synthesize KY zeolites, and with impregnation method, Ni supported zeolite catalysts were synthesized. Catalysts were used after pre-treatment by using hydrogen. HY catalysts showed high conversion at low temperatures; but low selectivity for conjugation reaction. KY catalysts showed low conversion at low temperatures; but similar conversion with HY catalysts at high temperature while high selectivity at low temperature. As a result, 4wt.% Ni/KY720 recorded high conjugation yield of 63.4% at 220℃. As for catalysts, physical and chemical features were checked through analysis of XRD (X-ray diffraction), ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometer), BET (Brunauer-Emmett, Teller) and NH3-TPD (Ammonia-temperature programmed desorption). Reactant and product material structure were analyzed through 1H-NMR, transition and selectivity were checked by GC(Gas chromatography) analysis.