The effects of alkali promoters on catalytic behaviors for synthesizing CH₃SH over Mo-based catalysts were investigated. The selectivity of CH₃SH for Na, K, Cs and non-alkali promoted catalysts are following in the order of Cs-Mo/SBA–15> K-Mo/SBA–15> Na-Mo/SBA–15> Mo/SBA-15. The addition of alkali metals dramatically improved the CH₃SH selectivity and CO conversion. The highest selectivity of CH₃SH was 66% obtained by incorporating Cs into Mo/SBA-15 which was superior to those reported in the current literature. Based on N₂ adsorption-desorption, XRD, Raman, XPS and NO-TPD characterizations, active MoS₂ species on oxidized Mo O-S species, obtained from the sulfidation temperature as low as 553 K, was considered as active sites for synthesizing CH₃SH. And it deemed that the different alkali metals (Na, K, Cs) could give rise to the difference in the sulfidation degree of Mo oxidized species and modify the chemical and electronic environment of the active sites, which resulted in the generation of distinguished concentration of Mo containing coordinatively unsaturated sites (Mo-CUS). Those concentrations of Mo-CUS were detected by NO-TPD to be 161, 210 and 222μmol/g, respectively, which had a positive relationship with the selectivity of CH₃SH.

研究了碱助剂对钼基催化剂上合成CH ₃ SH催化行为的影响。CH ₃ SH对Na，K，Cs和非碱助催化剂的选择性依次为Cs-Mo / SBA-15> K-Mo / SBA-15> Na-Mo / SBA-15> Mo / SBA-15。碱金属的添加显着改善了CH ₃ SH的选择性和CO的转化率。通过将Cs掺入Mo / SBA-15中，CH ₃ SH的最高选择性为66％，优于当前文献报道的那些。基于N ₂吸附-解吸，XRD，拉曼，XPS和NO-TPD表征，活性MoS ₂从低至553 K的硫化温度获得的氧化Mo OS物种上的这些物种被认为是合成CH ₃ SH的活性位点。并且认为，不同的碱金属（Na，K，Cs）可能会引起Mo氧化物种的硫化程度差异，并改变活性部位的化学和电子环境，从而导致显着浓度的Mo生成。 Mo含有配位不饱和位点（Mo-CUS）。NO-TPD法测得的Mo-CUS浓度分别为161、210和222μmol/ g，与CH ₃ SH的选择性呈正相关。