FEASIBILITY OF H2 PRODUCTION BY ACID CORROSION USING H2SIF6 AND WASTE FE SOURCES

This study investigated the feasibility of H2 production by acid corrosion, employing a by-product from the fertilizer industry (Hexafluorsilic acid - H2SiF6) and waste iron sources. Different masses of metal from three different sources: iron powder (waste from metal workshops), steel wool and rebar (construction waste), were reacted with various proportions of H2SiF6 with HCl. The influence of the variables was evaluated by factorial design, verifying greater production of H2 for materials with higher contact areas. The lowest production was observed for construction industry waste (rebar) probably due to the presence of protective films and lower contact area. The gas produced was analyzed by gas chromatography and was found to consist only of H2 (up to 99%) and air. The results indicate a promising application of H2SiF6, which is generated in large quantities during phosphate fertilizer production and has few commercial applications. The method proposed is promising, it does not emit toxic or polluting gases, contributing to the sustainable generation of H2.

本研究探究了采用酸腐蚀法制备氢气（H₂）的可行性，实验所用原料为化肥工业副产物六氟硅酸（Hexafluorsilic acid - H₂SiF₆）与各类废铁原料。选取三类不同来源的金属废料：金属车间废弃铁粉、钢丝棉及建筑废弃钢筋，设置不同投料质量，并将其与不同配比的六氟硅酸与盐酸（HCl）混合体系进行反应。通过析因设计（factorial design）评估各变量对产氢量的影响，结果证实接触面积更大的材料产氢量更高。建筑废弃钢筋的产氢量最低，这一现象可能源于其表面存在钝化保护膜且接触面积较小。采用气相色谱法（gas chromatography）对生成气体进行分析，结果显示其仅包含氢气（H₂，占比最高可达99%）与空气。研究结果表明，六氟硅酸具备可观的应用潜力——该物质在磷肥生产过程中会大量副产，但目前商用途径十分有限。本研究提出的制备方法极具应用前景，且不会释放有毒或污染性气体，有助于实现氢气的可持续生产。