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One-step pyrolysis-catalytic hydrogen production by the oleaginous microalga Chromochloris zofingiensis

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  • Gao, Weizheng
  • Wu, Qixuan
  • Fu, Zhongxiang
  • Li, Yaguang
  • Zhang, Zhao

Abstract

In this study, one-step pyrolysis-catalytic hydrogen production was developed with the substance of a typical oleaginous microalga, Chromochloris zofingiensis, with Ni/Zr0.2Ce0.8O2 as the catalyst. Our results demonstrated that the formation of a ZrO2–CeO2 solid provided thermal stability to the catalyst and showed abundant active sites for catalysis. Moreover, 450 °C was the optimum temperature for hydrogen production by microalgae. At this temperature, hydrogen production reached 25.47 mmol g−1, with hydrogen accounting for 43.5 % of the total gas, comparable to results previously reported for “two-step” hydrogen production methos. Further studies showed that lipids within microalgal cells were the major substance for hydrogen production, whereas starch and protein had limited hydrogen-producing capabilities. Therefore, by increasing the lipid content to 33.1 % of cell dry weight through abiotic stress, the hydrogen yields significantly improved, reaching 47.71 mmol g−1, with hydrogen constituting 69.4 % of the total gas. In summary, our study proved that oleaginous microalgae were feasible feedstock for one-step pyrolysis-catalytic hydrogen production.

Suggested Citation

  • Gao, Weizheng & Wu, Qixuan & Fu, Zhongxiang & Li, Yaguang & Zhang, Zhao, 2024. "One-step pyrolysis-catalytic hydrogen production by the oleaginous microalga Chromochloris zofingiensis," Energy, Elsevier, vol. 286(C).
    • Handle: RePEc:eee:energy:v:286:y:2024:i:c:s0360544223030694
    DOI: 10.1016/j.energy.2023.129675
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    References listed on IDEAS

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    1. Yaguang Li & Xianhua Bai & Dachao Yuan & Chenyang Yu & Xingyuan San & Yunna Guo & Liqiang Zhang & Jinhua Ye, 2023. "Cu-based high-entropy two-dimensional oxide as stable and active photothermal catalyst," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
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    Cited by:

    1. Rawat, Shweta & Wagadre, Lokesh & Kumar, Sanjay, 2024. "Multi-objective genetic algorithm approach for enhanced cumulative hydrogen and methane-rich syngas emission through co-pyrolysis of de-oiled microalgae and coal blending," Renewable Energy, Elsevier, vol. 225(C).

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