期刊
APPLIED CATALYSIS A-GENERAL
卷 650, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcata.2022.119012
关键词
Molybdenum oxide; Alumina; Metathesis; Dehydrogenation
The catalytic properties of molybdenum-alumina systems depend on the synthesis conditions. The effect of MoO3/Al2O3 catalyst pretreatment conditions on their activity in propylene and propane conversion was investigated. It was found that activation of the catalyst in an inert gas flow resulted in the highest propylene conversion and yields of metathesis products, while activation in hydrogen increased the activity and selectivity in propane dehydrogenation.
The catalytic properties of molybdenum-alumina systems depend on the synthesis conditions. Herein, we considered the effect of MoO3/Al2O3 catalyst pretreatment conditions on their activity in propylene and propane conversion. MoO3/Al2O3 catalysts were synthesized by wetness impregnation of the support with a solution of molybdenum citrate complex and activated in different atmospheres at 550-590 degrees C. The maximum conversion of propylene and yields of metathesis products were observed for the sample activated in an inert gas flow. This is caused by the formation of precursors of the metathesis active sites in this sample, i.e. isolated surface mono-molybdate species. Activation of the catalyst in hydrogen leads to the reduction of Mo6+ to Mo5+/Mo4+, which ensure the increased activity and selectivity in propane dehydrogenation. Therefore, it was shown that make it possible to purposefully change the properties of the same molybdenum-alumina catalyst to suit the problems of the specific reaction (metathesis, oligomerization, dehydrogenation, aromatization, cracking).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据