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<p>The utilisation of biomass-derived syngas as a methanol feedstock can diminish dependence on fossil fuels. However, robust Cu/ZnO catalysts are required for this process due to the unconventional composition of biomass-derived syngas. In the current study, the impact of Al<sub>2</sub>O<sub>3</sub> content on the catalytic performance of Cu/ZnO catalysts was thoroughly examined for methanol production from biomass pyrolysis syngas containing 25% H<sub>2</sub>, 25% CO, 20% CH<sub>4</sub>, 20% CO<sub>2,</sub> and N<sub>2</sub> (balance, 10 vol%) serving as an internal standard in the GC analysis. The co-precipitation technique was utilised to produce the catalysts, with fixed Cu/Zn = 2.43 and varied Al loadings of 0, 2, 4, and 8 wt%. The properties of calcined catalysts were examined using several characterisation techniques, including inductively coupled plasma optical emission spectroscopy, hydrogen temperature-programmed reduction, nitrogen physisorption, nitrous oxide chemisorption, particle size analyser, and X-ray diffraction. A high-pressure fixed-bed reactor was employed to assess the catalytic performance of the catalysts under reaction parameters of temperature (220–260&#xa0;°C), time on stream (6–24&#xa0;h), pressure (4&#xa0;MPa), and space velocity (2000&#xa0;h<sup>− 1</sup>). The catalyst evaluation demonstrated that the addition of Al improved methanol space-time yield and selectivity. The catalyst with 4 wt% of Al exhibited the highest methanol space-time yield (0.19&#xa0;g·g<sub>cat</sub><sup>−1</sup>·h<sup>− 1</sup>) among the tested catalysts, although the differences are subtle. The highest methanol space-time yield observed in the catalyst with 4 wt% of Al was ascribed to enhanced dispersion and surface area of Cu, and increased Brunauer-Emmett-Teller surface area.</p> Graphical Abstract <p></p>

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Effect of Al loading on the catalytic performance of Cu/ZnO catalysts in methanol production from biomass pyrolysis syngas

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Sabar Pangihutan Simanungkalit,
  • Chiemeka Onyeka Okoye,
  • Zhezi Zhang,
  • Dongke Zhang

摘要

The utilisation of biomass-derived syngas as a methanol feedstock can diminish dependence on fossil fuels. However, robust Cu/ZnO catalysts are required for this process due to the unconventional composition of biomass-derived syngas. In the current study, the impact of Al2O3 content on the catalytic performance of Cu/ZnO catalysts was thoroughly examined for methanol production from biomass pyrolysis syngas containing 25% H2, 25% CO, 20% CH4, 20% CO2, and N2 (balance, 10 vol%) serving as an internal standard in the GC analysis. The co-precipitation technique was utilised to produce the catalysts, with fixed Cu/Zn = 2.43 and varied Al loadings of 0, 2, 4, and 8 wt%. The properties of calcined catalysts were examined using several characterisation techniques, including inductively coupled plasma optical emission spectroscopy, hydrogen temperature-programmed reduction, nitrogen physisorption, nitrous oxide chemisorption, particle size analyser, and X-ray diffraction. A high-pressure fixed-bed reactor was employed to assess the catalytic performance of the catalysts under reaction parameters of temperature (220–260 °C), time on stream (6–24 h), pressure (4 MPa), and space velocity (2000 h− 1). The catalyst evaluation demonstrated that the addition of Al improved methanol space-time yield and selectivity. The catalyst with 4 wt% of Al exhibited the highest methanol space-time yield (0.19 g·gcat−1·h− 1) among the tested catalysts, although the differences are subtle. The highest methanol space-time yield observed in the catalyst with 4 wt% of Al was ascribed to enhanced dispersion and surface area of Cu, and increased Brunauer-Emmett-Teller surface area.

Graphical Abstract