摘要
采用XRD、EXAFS等技术研究微量贵金属Rh对活性炭担载的Rh -Mo -K合成醇催化剂结构的影响 ,并关联其催化性能。氧化态Rh -Mo -K/AC样品中Rh与Mo有着较强的相互作用 ,使得K2 Mo2 O7向MoO2 转化。硫化还原后 ,Mo主要以MoS2 微晶形式存在 ,其有序结构尺度随Rh含量的增加而减小。经Rh助剂修饰后 ,催化剂的合成醇催化性能有明显的提高。
The structures of oxidic and sulfided Rh-Mo-K/AC catalysts were studied by means of XRD and EXAFS techniques. Activities for mixed alcohol synthesis via CO hydrogenation were used to measure the catalytic properties of these catalysts. In the oxidic Rh-Mo-K/AC catalyst samples, there is strong interaction between Rh and Mo species, which may shift K 2Mo 2O 7 to MoO 2. Molybdenum species are mainly converted into MoS 2 crystallites after sulfidation treatment, and the local ordered structure is shrunken with the increase in Rh loading. The incorporation of rhodium shows high performance of alcohol synthesis from carbon monoxide hydrogenation.
基金
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