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首页> 外文期刊>Energy Conversion & Management >Catalytic performance of semi-coke on hydrogen iodide decomposition in sulfur-iodine thermochemical cycle for carbon dioxide-free hydrogen production
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Catalytic performance of semi-coke on hydrogen iodide decomposition in sulfur-iodine thermochemical cycle for carbon dioxide-free hydrogen production

机译：半焦对硫碘热化学循环中碘化氢分解无二氧化碳制氢的催化性能

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摘要

Sulfur-iodine thermochemical water splitting cycle is a promising and carbon dioxide-free method for hydrogen production. Among the reactions in this cycle, hydrogen iodide catalytic decomposition is the rate-determining step. In this study, catalytic reactivity test combined with characterizations of nitrogen physisorption, X-Ray diffraction, and Raman spectroscopy provide evidences that hydrofluoric acid modified semi-coke is a promising catalyst candidate for hydrogen iodide decomposition because of its high active and low cost. The raw semi-coke enhanced the hydrogen iodide conversion rate. After modification of hydrofluoric acid, the catalytic activity of semi-coke increased largely. Semi-coke modified by 40 wt% hydrofluoric acid showed better performance than commercial activated carbon catalyst. Combine the characterization results and catalytic reactivity, the graphitic edge carbon atoms in semi-coke are the active sites for hydrogen iodide decomposition. This finding pointed out the direction of carbon material catalyst design for hydrogen iodide decomposition.
机译：硫碘热化学水分解循环是一种有前途且无二氧化碳的制氢方法。在该循环的反应中，碘化氢催化分解是决定速率的步骤。在这项研究中，催化反应性测试与氮物理吸附，X射线衍射和拉曼光谱的表征相结合，提供了证据表明氢氟酸改性的半焦因其高活性和低成本而成为碘化氢分解的有希望的催化剂。原料半焦提高了碘化氢的转化率。氢氟酸改性后，半焦的催化活性大大提高。经40 wt％氢氟酸改性的半焦比商用活性炭催化剂表现出更好的性能。结合表征结果和催化反应性，半焦中的石墨边缘碳原子是碘化氢分解的活性位点。这一发现指出了碳材料催化剂设计用于碘化氢分解的方向。

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