采用等体积共浸渍法，制备了一批不同钾含量的KxMoP/Al2O3（x表示K与Mo摩尔比，0≤x≤3）催化剂，考察其对高硫合成气制甲硫醇性能的影响，并采用X射线衍射分析（XRD）、程序升温还原法（TPR）和激光拉曼光谱（LRS）等技术手段对催化剂进行了表征。结果表明，氧化铝负载的磷钼氧化物前驱体在850℃经H2气还原制备出了MoP/Al2O3催化剂，少量添加钾催化剂有较高的甲烷选择性，大量添加钾助剂促进了催化剂表面活泼钼硫物种的生成，使得磷化钼基催化剂有较好的甲硫醇选择性，而过量添加钾又会阻碍了甲硫醇的生成。当n（K）/n（Mo）比在2~2.5之间时，磷化钼基催化剂对该反应有较好的催化活性。
A series of KxMoP/Al2O3(x is K/Mo molar ratio, 0≤x≤3) catalysts with different K/Mo molar ratios was prepared through co-impregnation and characterized using X-ray diffraction(XRD), temperature-programmed reduction(TPR) and laser Raman spectroscopy(LRS). The effects of different potassium content of the catalysts for the synthesis of methyl mercaptan from high H2S-containing syngas were investigated. The results indicate that MoP/Al2O3 catalysts are formed by hydrogen reduction at 850℃ from phosphorus molybdenum oxide precursor. With a small amount of potassium, the catalysts show higher methane selectivity. Further increase of potassium content promotes the generation of activity molybdenum sulfur phase, showing good methyl mercaptan selectivity. Excessive potassium hinders the generation of methyl mercaptan. When K/Mo molar ratio is between 2 and 2.5, MoP-based catalysts shows good catalytic activity and selectivity.
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