A bulk γ-Al₂O₃ catalyst shows high selectivity for propane dehydrogenation upon pretreatment and co-feeding with H₂S. The reaction kinetics, deactivation rates, and active sites for propane dehydrogenation on this catalyst were characterized using fixed bed conversion studies, NH₃-TPD, O₂-TPO, XPS, and density functional theory (DFT). Specifically, we observe that the selectivity to propylene was 94% at ca. 16% propane conversion at 560 °C for a C₃H₈:H₂:H₂S ratio of 1.1:1:0.1 on γ-Al₂O₃. Our results indicate that H₂S can irreversibly modify the active sites of γ-Al₂O₃, postulated to be defect sites on the 110 facet comprised of a tri-coordinated Al atom, such that the modified site was more active and selective towards propylene and less inhibited by co-fed H₂S. Along with XPS and O₂-TPO, the dehydrogenation-regeneration experiments suggest the formation of sulfurous coke and strong adsorption of reaction products result in a less active catalyst. This study shows the potential of alumina/metal-sulfide as an earth-abundant and relatively benign class of catalysts for alkane activation, especially in the context of sour natural gas upgrading.

阿散的γ-Al _2个ö ₃用于在预处理和共同进料丙烷脱氢用H催化剂显示出高的选择性₂ S的反应动力学，失活速率，并在该催化剂上丙烷脱氢活性位点，使用固定床转化研究，其特征在于， NH ₃ -TPD，O ₂ -TPO，XPS和密度泛函理论（DFT）。具体而言，我们观察到在约200℃下对丙烯的选择性为94％。在560℃下16％的丙烷转化为一个C ₃ ħ ₈：H ₂：H ₂的1.1 S比：1：0.1上的γ-Al ₂ ö ₃。我们的结果表明H ₂S可不可逆地修改的活性位点的γ-Al ₂ ö ₃，假定为在110小面由一三-配位铝原子，的缺陷位点，使得所述改性部位是对丙烯多种活性和选择性和通过共少抑制H ₂ S喂入。与XPS和O ₂ -TPO一起进行脱氢再生实验表明，形成了硫焦炭，反应产物的强烈吸附导致催化剂活性降低。这项研究表明，氧化铝/金属硫化物具有丰富的地球活性和相对良性的烷烃活化催化剂潜力，尤其是在酸性天然气升级的情况下。