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Table 2. Fatty acid and elemental compositions of technical grade triolein and waste cooking oil (WCO). Feedstock Triolein WCO Fatty acid composition as wt. % methyl esters Dodecanoic acid [C12:0] Palmitic acid [C16:0] Stearic acid [C18:0] Oleic acid [C18:1] Linoleic acid [C18:2] - 1.2 1.1 37.2 1.9 4.9 75.6 48.8 21.4 7.9 Carbon Hydrogen Oxygen Nitrogen 79.4 79.4 12.0 12.6 8.6 7.8 Elemental composition, wt. % 0 0.2 [Cx:y] where x is the number of carbon atoms and y is the number of double bonds. Table 3. The catalytic performance of ZSC-24 catalyst in the cracking of triolein under different severities by varying the CTO ratio from 0 (glass beads) to 1.2 g·g−1 at 550 ◦C. CTO ratio (g·g−1) Conversion (wt. %) 0 0.2 24.7 62.5 6.4 21.0 1.3 2.1 1.7 13.1 1.9 13.5 3.5 5.8 17.0 34.9 29.6 22.4 45.7 15.1 0.1 1.0 1.1 5.6 0.4 0.8 1.2 70.9 77.5 79.6 28.0 38.9 41.0 2.3 3.0 4.0 18.0 28.9 33.0 18.2 29.4 33.5 7.6 7.1 4.1 35.2 29.7 28.8 18.7 14.4 12.1 10.4 8.1 8.3 1.6 2.4 2.3 6.1 6.5 7.5 Product yields (wt. %) Total gas Dry gas LPG C2–C4 olefins CO, CO2 C5+ Gasoline LCO HCO Coke Water Selectivity to C2–C4 olefins (%) a wt. % on a feed basis. a fraction of C2–C4 olefins per total C2–C4 hydrocarbons. From Table 3, it can be seen that the thermal cracking (blank test) of triolein occurs noticeably at 550 ◦C, giving a conversion of 24.7 wt. %. However, the low fraction of short-chain products suggests that most of the heavy oxygenated compounds formed by the decomposition of triglycerides were not converted in the absence of catalyst, which is in line with the previous reports [6,8]. In the presence of the ZSC-24 catalyst, the yields of light products such as gas and gasoline rise dramatically at the expense of heavy fractions such as HCO and LCO. This indicates 67.7 90.9 91.7 93.7 92.0 196PDF Image | Zeolite Catalysis
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