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Abstract <p>This study investigates the effects of feed gas composition (CO/H<sub>2</sub>, CO<sub>2</sub>/H<sub>2</sub>, or CO/CO<sub>2</sub>/H<sub>2</sub>) on the activity and selectivity of an Fe-based composite catalyst (20Fe/2K–2V/PVA) for the synthesis of oxygenates, specifically higher alcohols. Physicochemical characterization using Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis revealed that feed gas composition governs the final phase composition of the active catalyst (χ-Fe<sub>5</sub>C<sub>2</sub>, Fe, Fe<sub>3</sub>O<sub>4</sub>). The highest yield of higher (C<sub>5+</sub>) alcohols (up to 3.4 g/m<sup>3</sup>), with carbon conversion of approximately 46% and higher alcohols accounting for up to 19% of hydrocarbon products (C<sub>4</sub>–C<sub>7</sub> to C<sub>8+</sub> ratio ≈ 3), was achieved at a CO : CO<sub>2</sub> : H<sub>2</sub> ratio of 1 : 1 : 6. The distribution of higher alcohols follows the Anderson–Schulz–Flory model, confirming a polymerization mechanism for chain growth.</p>

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Direct Synthesis of Oxygenates over Fe-Based Composite Catalysts: Effect of Feed Gas Composition

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Ivan V. Bliznetsov,
  • Mikhail I. Ivantsov,
  • Mayya V. Kulikova

摘要

Abstract

This study investigates the effects of feed gas composition (CO/H2, CO2/H2, or CO/CO2/H2) on the activity and selectivity of an Fe-based composite catalyst (20Fe/2K–2V/PVA) for the synthesis of oxygenates, specifically higher alcohols. Physicochemical characterization using Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis revealed that feed gas composition governs the final phase composition of the active catalyst (χ-Fe5C2, Fe, Fe3O4). The highest yield of higher (C5+) alcohols (up to 3.4 g/m3), with carbon conversion of approximately 46% and higher alcohols accounting for up to 19% of hydrocarbon products (C4–C7 to C8+ ratio ≈ 3), was achieved at a CO : CO2 : H2 ratio of 1 : 1 : 6. The distribution of higher alcohols follows the Anderson–Schulz–Flory model, confirming a polymerization mechanism for chain growth.