Effects of Promoters of Cobalt-Based Catalysts on the Yield of Diesel-Range Hydrocarbons in Fischer–Tropsch Synthesis

Effects of Promoters of Cobalt-Based Catalysts on the Yield of Diesel-Range Hydrocarbons in Fischer–Tropsch Synthesis Научная публикация

Журнал

Petroleum Chemistry
ISSN: 0965-5441 , E-ISSN: 1555-6239

Вых. Данные

Год: 2025, Том: 65, Номер: 3, Страницы: 268-276 Страниц : 9 DOI: 10.1134/s0965544125600493

Авторы

Eliseev O.L. ^1,2 , Smirnova E.M. ¹ , Mazurova K.M. ¹ , Kazantsev R.V. ¹ , Zubkov I.N. ³ , Yakovenko R.E. ³ , Demikhova N.R. ¹ , Glotov A.P. ¹ , Stavitskaya A.V. ¹

Организации

1	National University of Oil and Gas “Gubkin University”, 119991, Moscow, Russia
2	Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia
3	Platov South Russian State Polytechnic University, 346428, Novocherkassk, Russia

The paper investigates the effects of lanthanum and manganese promotion (3 wt %) on the physicochemical properties and catalytic performance of a supported 15%Co/Al2O3 catalyst in the synthesis of hydrocarbons from Co and H2. The catalysts were prepared by impregnating the support with relevant metal nitrate solutions followed by drying, calcination, and hydrogen activation. The samples were characterized by X-ray diffraction analysis (XRD), low-temperature nitrogen adsorption, temperature-programmed reduction (TPR), and transmission electron microscopy (TEM). The catalytic performance was tested in fixed-bed flow-type reactors at 240°C, 2 MPa, and CO/H2 = 1 : 2 with the feed GHSV being varied. At a CO conversion of about 50%, the promoted catalysts exhibited an increase in the C5+ selectivity and a drop in the methane selectivity in the order of Co < Co–La < Co–Mn. The Mn promotion increased the hydrocarbon chain growth probability up to 0.89, thus enhancing the yield of the most valuable products such as diesel-range and solid hydrocarbons. In the presence of 15Co3.15Mn/Al2O3, a C5+ selectivity of 45.3% was achieved at 86% CO conversion. Under high CO conversion conditions (80–86%), the selectivity towards higher hydrocarbons markedly declined, apparently due to the intensification of the water gas shift reaction. Nonetheless, even under these conditions, the Co–Mn catalyst provided the highest relative content of diesel-range hydrocarbons in the products. For 15Co3.15Mn/Al2O3, the C11–C18 selectivity reached 56.7 at 51.4% CO conversion and 41.2 at 86% CO conversion. The C11–C18 selectivity values provided by 15Co/Al2O3 were 10–20% lower (51.8 and 35.0%, respectively).

Eliseev O.L. , Smirnova E.M. , Mazurova K.M. , Kazantsev R.V. , Zubkov I.N. , Yakovenko R.E. , Demikhova N.R. , Glotov A.P. , Stavitskaya A.V.
Effects of Promoters of Cobalt-Based Catalysts on the Yield of Diesel-Range Hydrocarbons in Fischer–Tropsch Synthesis
Petroleum Chemistry. 2025. V.65. N3. P.268-276. DOI: 10.1134/s0965544125600493 OpenAlex

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