On-board desulfurization is essential to operate fuel-cell-based auxiliary power units (APU) with commercial fuels. In this work, both (i) on-board desulfurization and (ii) on-board regeneration performance of Ag-Al₂O₃ adsorbent is investigated in a comprehensive manner. The herein investigated regeneration strategy uses hot APU off-gas as the regeneration medium and requires no additional reagents, tanks, nor heat exchangers and thus has remarkable advantages in comparison to state-of-the-art regeneration strategies. The results for (i) show high desulfurization performance of Ag-Al₂O₃ under all relevant operating conditions and specify the influence of individual operation parameters and the combination of them, which have not yet been quantified. The system integrated regeneration strategy (ii) shows excellent regeneration performance recovering 100% of the initial adsorption capacity for all investigated types of fuels and sulfur heterocycles. Even the adsorption capacity of the most challenging dibenzothiophene in terms of regeneration is restored to 100% over 14 cycles of operation. Subsequent material analyses proved the thermal and chemical stability of all relevant adsorption sites under APU off-gas conditions. To the best of our knowledge, this is the first time 100% regeneration after adsorption of dibenzothiophene is reported over 14 cycles of operation for thermal regeneration in oxidizing atmospheres.

车载脱硫对于使用商业燃料运行基于燃料电池的辅助动力装置（APU）至关重要。在这项工作中，全面研究了（i）Ag-Al ₂ O ₃吸附剂的车载脱硫和（ii）车载再生性能。本文研究的再生策略使用热的APU废气作为再生介质，并且不需要其他试剂，储罐或热交换器，因此与最新的再生策略相比具有显着的优势。（i）的结果显示出Ag-Al ₂ O _3的高脱硫性能。在所有相关的操作条件下，并指定尚未量化的单个操作参数及其组合的影响。系统集成的再生策略（ii）显示了出色的再生性能，可以对所有研究类型的燃料和硫杂环化合物恢复100％的初始吸附容量。即使是最具挑战性的二苯并噻吩在再生方面的吸附能力也可以在14个操作周期内恢复到100％。随后的材料分析证明了在APU废气条件下所有相关吸附位点的热稳定性和化学稳定性。据我们所知，这是首次报道在氧化气氛中经过14个运行循环进行二苯并噻吩吸附后100％再生。