Understanding the secondary reactions of olefins in Fischer Tropsch Synthesis (FTS) is crucial in enhancing olefin selectivity in Fischer Tropsch to Olefin reaction. Equal molar ethylene towards CO was used as a probe to be cofed into the syngas (H2:CO=2) to study the effect on the products distribution over cobalt based catalysts supported on a-alumina, g-alumina and carbon nanotube (CNT), respectively. The experiments were performed at T = 210°C; Ptot = 1.85 bar, PCO = 0.11 bar; PH2 = 0.22 bar; PC2H4 = 0 or 0.11 bar balance with Ar. On all the supports, ethylene co-feeding at this concentration inhibits CO conversion and the products are mainly from ethylene conversion. The products showed similar ASF distribution as typical FTS products. Ethylene co-feeding can both enhance the chain growth probability as well as significant increase O/P ratio of C3-C6 hydrocarbons. An isotopic switch from 12CO/H2/C2H4/Arà13CO/H2/Kr followed by a GC-MS could give the isotopic contribution in different products. The contribution of C2H4 incorporation into the growing chain, hydrogenation, oligomerization and hydrogenolysis will be discussed.

Ethylene co-feeding effect on Fischer–Tropsch synthesis to olefin over Co based catalysts

2019 Fall National Meeting

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