Hydrogen production via water-gas shift (WGS) reaction using heavy oil residues as syngas source is an attractive way to improve refinery margin. However, this low cost syngas may present significant concentration of sulfur, leading to poisoning of usual WGS catalysts. Searching for sulfur tolerant catalysts, the performance of niobia supported platinum, gold and copper catalysts was evaluated under near-industrial conditions, in the absence and presence of H₂S. Cu/Nb₂O₅ catalyst was inactive, even under clean conditions. Au/Nb₂O₅ presented higher activity and complete deactivation when exposed to sulfur, but recovered its catalytic activity with the removal of H₂S from the reaction mixture, indicating a reversible deactivation. Pt/Nb₂O₅ catalyst was the most suitable among the catalysts evaluated to be used in sour conditions, not deactivating when exposed to 50 ppm and 1000 ppm of H₂S.

通过使用重油渣油作为合成气源的水煤气变换（WGS）反应生产氢是提高炼油厂利润率的一种有吸引力的方法。但是，这种低成本的合成气可能会出现大量的硫，导致常规WGS催化剂中毒。为了寻找耐硫催化剂，在不存在和存在H ₂ S的情况下，在接近工业条件下评估了由纳米比亚负载的铂，金和铜催化剂的性能。即使在清洁条件下，Cu / Nb ₂ O ₅催化剂也是惰性的。Au / Nb ₂ O ₅暴露于硫时表现出较高的活性和完全失活，但通过去除H ₂恢复了其催化活性。反应混合物中的S，表明可逆失活。在评估为在酸性条件下使用的催化剂中，Pt / Nb ₂ O ₅催化剂最合适，当暴露于50 ppm和1000 ppm的H ₂ S时不会失活。