from first principles PP-I-1

PP-III-102СО 2 Tolerancy of Highly Productive Composite Fischer–Tropsch Co CatalystSineva L.V. 1,2 , Ermolaev V.S. 1,2 , Mitberg E.B. 1 , Solomonik I.G. 1 , Khatkova E.Yu. 1 ,Mordkovich V.Z. 1,21 Technological Institute for Superhard and Novel Carbon Materials, Troitsk, Russia2 INFRA Technologies Ltd., Moscow, Russiasinevalv@tisnum.ruFischer–Tropsch synthesis (FTS) is often considered as an important step in catalyticprocessing of renewables or of stranded fossils. It is a process of catalytic conversion ofCO-H 2 mixture (syngas) into liquid hydrocarbons [1, 2]. The syngas production technologiesnever provide CO-H 2 only; actual CO 2 content may reach up to 30% [3, 4]. Although CO 2removal before FTS is considered an obligatory step, recent literature discusses a potentialcost advantage if CO 2 is not removed [5]. Indeed, if CO 2 is hydrogenated along with CO ortolerated in the FT reactor, the expensive CO 2 removal step may be eliminated. Literaturereports here very contradictive data on the subject. It is therefore interesting to investigate theeffect of carbon dioxide on a cobalt highly productive composite catalyst under FTSconditions.The effect of CO 2 on Fischer–Tropsch synthesis (FTS) on a cobalt based highly productivecomposite catalyst was investigated in fixed bed reactors at laboratory scale and pilot scale.Two types of feed gas, i.e. H 2 :CO:N 2 and H 2 :CO:CO 2 :N 2 were used. It has been shown thatCO 2 acts as an inert diluting agent if its concentration is below 30 vol. %. Testing of thehighly productive composite catalyst has confirmed that this catalyst is tolerant to carbondioxide. The results could have implications for the design of XTL processes (anything-toliquidsis a process that converts carbon and energy containing feedstock to high qualityfuels). In particular, it might be advantageous to keep some carbon dioxide in the syngas feedto the FTS process. The mechanism of this specific tolerancy towards CO 2 is not yet clear,possible options are discussed in the paper.References:[1] R.B. Anderson. The Fischer–Tropsch Synthesis. Academic Press: Orlando, FL, 1984[2] Fischer–Tropsch Technology. Studies in Surface Science and Catalysis. Ed. By M. Dry,A. Steynberg. Amsterdam: Elsiver, 2004[3] D.J. Wilhelm, D.R. Simbeck, A.D. Karp, R.L. Dickenson. Fuel Process. Technol. 71 (2001) 139[4] C. Higman, M. Burgt. Gasification. Guif professional publishing: Burlington, 2003[5] T. Riedel, G. Schaub. Top. In Catal. 26 (2003) 145262