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Catalytic Decarboxylation of Oleic Acid Over Ceria-Zirconia Catalysts

Boonyarach Kitiyanan1, Charothon Ung-jinda1, Vissanu Meeyoo2, Thirasak Rirksomboon1, and Pramoch Rangsunvigit1. (1) The Petroleum and Petrochemical College, Chulalongkorn University, The Petroleum and Petrochemical College, Chulalongkorn University, 254 Soi Chula 12 Prayathai Rd., Bangkok, 10330, Thailand, (2) Mahanakorn University of Technology, 51 Cheum-Sampan Road, Nong-Chok, Bangkok, 10530, Thailand

The catalytic deoxygenation of oleic acid was studied over ceria-zirconia mixed metal oxide (CZMMO), Ce1-xZrxO2 (x = 0, 0.25, 0.50, 075 and 1.0), and Fe, Ni, Cu and Rh loaded on the CZMMO catalysts. Experiments were carried out in a continuous flow reactor within the temperature range of 325-425oC. The gaseous products mainly are CO and CO2 while the main compositions in liquid products are C17 and C18 hydrocarbons. The difference in the product distribution was insignificant for all types of the catalysts used in this work. Surprisingly, Ce0.75Zr0.25O2 exhibits the highest catalytic activity for the deoxygenation of oleic acid with high selectivity toward C17 hydrocarbons. The catalytic activities of metal supported on Ce0.75Zr0.25O2 catalysts are lower than that of Ce0.75Zr0.25O2. This is due to a product hindrance. A kinetic study of deoxygenation of oleic acid over Ce0.75Zr0.25O2 support was further carried out. First order kinetic was well fitted for the deoxygenation of oleic acid and the estimated activation is ca. 23 kcal mol-1.