稀土金属盐促进的Mo-Co-K硫化物基催化剂用于合成气选择性制乙醇等低碳混合醇

采用超声法在非水溶剂介质中制备了稀土金属La盐等促进的硫化钼基催化剂,考察了其CO加氢选择性合成乙醇等低碳混合醇的催化性能.在3.0MPa,330℃和H2/CO(体积比)=2.0的反应条件下,La促进的催化剂表现出较Mo-Co-K硫化物基催化剂更高的催化活性,CO转化率和产物中乙醇的分布可分别达到17.2%和53.4%.扫描电镜、透射电镜、X射线衍射和光电子能谱等表征结果表明,稀土金属La盐的加入改善了Mo-Co-K硫化物基催化剂的外观形貌和电子结构,对提高催化活性和乙醇的分布起到重要的作用.

Mo–Co–K Sulfide-Based Catalysts Promoted by Rare Earth Salts for Selective Synthesis of Ethanol and Mixed Alcohols from Syngas

Mo–Co–K sulfide-based catalysts promoted by rare earth metal salts (La, Ce, and Y) were prepared by an ultrasonic technology in a non-aqueous medium. The catalytic performance for the selective synthesis of ethanol and mixed alcohols from syngas was evaluated and compared with that of the unpromoted catalyst Mo–Co–K. Under the reaction conditions of 3.0 MPa, 330°C, H₂/CO(V/V) = 2.0, and GHSV = 2225 h⁻¹, the CO conversion and ethanol distribution over the La-promoted catalyst were 17.2% and 53.4%, respectively. The results of SEM, TEM, XRD, Raman, and XPS characterization indicated that the morphology and electronic structure of the catalysts changed, and the CO conversion and ethanol distribution increased after the addition of rare earth promoters.