数字农科院2.0

Enhanced Hydrogen Production and Carbon Suppression via a Two-Stage Catalytic System of Biochar Pre-Catalysis and Ni-Based Catalysts during Biomass Pyrolysis

文献类型： 外文期刊

作者： Xinyi Zhang;Lixin Zhao;Zonglu Yao;Jixiu Jia;Yuxuan Sun;Lili Huo

关键词： biomass pyrolysis; biochar pre-catalyst; metal-support catalyst; hydrogen production; char

期刊名称： Biochar

ISSN： 2524-7972

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; CSCD（2025-2026年度） ; ; 农林核心（2024版）

摘要： A new two-stage catalytic system was developed to overcome the problems of low yield of hydrogen-rich gas and serious carbon deposition on the catalyst during biomass pyrolysis catalysis. The operating temperature, catalyst type and catalyst addition ratio were compared, and the optimum hydrogen production conditions were obtained (gas yield reached 52.21 wt% and the hydrogen yield reached 29.15 vol%). The catalysts were modified by metals, including Ni, Ni–Co, Ni–Fe, Ni–Mo and Ni–Ce. Ni–Ce/Al2O3 exhibited the highest tar-cracking efficiency during one-stage catalysis, attributed to the redox cycle between Ce3+/Ce4+. In order to further improve the catalytic performance, the biochar precatalytic layer with rich porous structure and surface functional groups was introduced. Macromolecular volatiles were selectively adsorbed by pre-catalyst and promoted by chain reaction. Macromolecular volatiles were selectively adsorbed by the pre-catalyst, in which the tar reforming reaction was promoted, resulting in an increase in hydrogen production to 29.76-48.87 vol% in two-stage catalysis. In addition, Biochar pre-catalyst promoted free radical recombination by enhancing the formation of H2 and H· and reducing the binding of polycyclic aromatic hydrocarbons, which effectively inhibited carbon deposition. This study provides theoretical insights and proposes a novel stepwise catalytic strategy for efficient hydrogen production from biomass, highlighting its potential for practical energy conversion applications.

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