钾离子对一步法制甲硫醇钼基催化剂的影响

摘要

Molybdenum based catalysts of Mo/SBA-15 and KMo/SBA-15 were prepared via the incipient-wetness impregnation method , with high surface area SBA-15 as the support. N2 adsorption-desorption,XRD,Raman and XPS were carried out to investigate the effect of K on the CH3SH synthesis progress. Dynamics study showed that the CO conversion and CH3SH selectivity were greatly improved when K was added,and the selectivity of CH3SH over KMo/SBA-15 reached 62% under high H2S concentration,higher than other reported catalysts. Based on the Raman and XPS results,the MoS2 content increased with the addition of K.%选用具有高比表面积的介孔分子筛SBA-15作为载体,采用等体积浸渍法制备Mo/SBA-15和KMo/SBA-15催化剂并用于一步法合成甲硫醇,并采用氮气吸脱附(BET)、X 射线衍射分析(XRD)、拉曼光谱(Raman)、X射线光电子能谱分析(XPS)等进行表征,研究钾离子的添加对催化合成甲硫醇的影响.结果表明,K的添加大幅提升了Mo/SBA-15的甲硫醇选择性和CO的转化率;在高浓度H2S环境下,KMo/SBA-15催化剂上甲硫醇选择性达到了62%,高于目前文献报道的催化剂.Raman、XPS表征结果表明,添加K的催化剂上硫化后加氢脱硫活性相MoS2含量增多.