Effect of CO Concentration on the α-Value of Plasma-Synthesized Co-C Catalyst in Fischer-Tropsch SynthesisReportar como inadecuado


Effect of CO Concentration on the α-Value of Plasma-Synthesized Co-C Catalyst in Fischer-Tropsch Synthesis


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1

Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada

2

Canadian Light Source Inc., Saskatoon, SK S7N 2 V3, Canada





*

Author to whom correspondence should be addressed.



Academic Editor: Leonarda F. Liotta

Abstract A plasma-synthesized cobalt catalyst supported on carbon Co-C was tested for Fischer-Tropsch synthesis FTS in a 3-phase continuously-stirred tank slurry reactor 3-φ-CSTSR operated isothermally at 220 °C 493 K, and 2 MPa pressure. Initial syngas feed stream of H2:CO ratio = 2 with molar composition of 0.6 L-L 60 vol % H2 and 0.3 L-L 30 vol % CO, balanced in 0.1 L-L 10 vol % Ar was used, flowing at hourly space velocity GHSV of 3600 cm3·h−1·g−1 of catalyst. Similarly, other syngas feed compositions of H2:CO ratio = 1.5 and 1.0 were used. Results showed ~40% CO conversion with early catalyst selectivity inclined towards formation of gasoline C4–C12 and diesel C13–C20 fractions. With prolonged time-on-stream TOS, catalyst selectivity escalated towards the heavier molecular-weight fractions such as waxes C21+. The catalyst’s α-value, which signifies the probability of the hydrocarbon chain growth was empirically determined to be in the range of 0.85–0.87 at H2:CO ratio = 2, demonstrating prevalence of the hydrocarbon-chain propagation, with particular predisposition for wax production. The inhibiting CO effect towards FTS was noted at molar H2:CO ratio of 1.0 and 1.5, giving only ~10% and ~20% CO conversion respectively, although with a high α-value of 0.93 in both cases, which showed predominant production of the heavier molecular weight fractions. View Full-Text

Keywords: alpha-value; cobalt-catalyst; plasma-synthesis; carbon; Fischer-Tropsch alpha-value; cobalt-catalyst; plasma-synthesis; carbon; Fischer-Tropsch





Autor: James Aluha 1, Yongfeng Hu 2 and Nicolas Abatzoglou 1,*

Fuente: http://mdpi.com/



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