Mo-SBA-15催化剂催化甲烷选择氧化

Selective oxidation of methane catalyzed by Mo-SBA-15 catalysts

以过渡金属Mo为活性组分,SBA-15为载体,采用原位水热法制备了不同Mo含量的掺杂型Mo-SBA-15催化剂,采用多种表征手段研究了系列催化剂的结构和物化性质,并评价了催化剂在不同温度的甲烷选择氧化制甲醛性能。实验结果表明:原位掺杂提高了MoO_(x)物种的分散度,因而有利于催化剂催化活性的提高;Mo掺杂量对催化剂催化性能有明显的影响,当Mo的掺杂量为0.05%和0.1%时,催化剂的催化性能较好。600℃时,0.05Mo-SBA-15和0.1Mo-SBA-15催化剂上甲醛的收率分别为4.1%和4.6%。

The doped Mo-SBA-15 catalysts with different Mo contents were prepared by an in-situ hydrothermal method using the transition metal Mo as the active component and SBA-15 as the support.The catalytic performance over the series catalysts for the selective oxidation of methane to formaldehyde at different temperatures were evaluated,and the structure and physicochemical properties of these catalysts were also studied by various characterizations.The experimental results show that the in-situ incoporation can improve the dispersion of MoO_(x)species,which was conducive to the enhancement of catalytic activity.The doping amount of Mo had an obvious effect on the catalytic performance.When the doping amount of Mo was 0.05%and 0.1%,satisfactory catalytic results can be obtained.At 600℃,the yields of formaldehyde over 0.05Mo-SBA-15 and 0.1Mo-SBA-15 catalysts were 4.1%and 4.6%,respectively.