Improvement the promotional efficiency of Ru by controlling the position and distribution of RuO2 precursors on CoRu/SiO2 catalyst
Improvement the promotional efficiency of Ru by controlling the position and distribution of RuO2 precursors on CoRu/SiO2 catalyst
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DOI：
10.1016/j.catcom.2012.02.022
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发表时间：
2012-05
影响因子：
3.7
通讯作者：
Qian Han;N. Yao;Yu-mei Shi;Huafeng Ma;Xiaonian Li
中科院分区：
文献类型：
--
作者：
Qian Han;N. Yao;Yu-mei Shi;Huafeng Ma;Xiaonian Li
聚乙二醇（PEG）的存在降低了Co 3 O 4的晶粒尺寸，并在煅烧后的CoRuOx/SiO2样品上形成了均匀分布的RuO 2和Co 3 O 4颗粒之间的紧密接触。这种结构有利于小的Co 3 O 4颗粒的还原。在F-T合成反应中，Co 0小颗粒和Co-Ru协同作用提高了Co的时间收率和转换频率（TOF）。相比之下，无PEG工艺导致了RuO 2颗粒的不均匀分布和偏析。与不含Ru的Co/SiO2催化剂相比，分离后的RuO 2前驱体能促进Co 3 O 4的还原，但对TOF的影响较小。
The presence of polyethylene glycol (PEG) in a co-impregnation process reduced the crystallite size of Co3O4and formed a close contact between the uniformly distributed RuO2and Co3O4particles on CoRuOx/SiO2sample after calcination. This structure facilitated the reduction of small Co3O4particles. The resultant small Co0particles and Co-Ru synergistic effect enhanced the Co-time yield and turnover frequency (TOF) in Fischer–Tropsch synthesis. Comparatively, the PEG-free process led to the inhomogeneous distribution and segregation of RuO2particles. These separated RuO2precursors could improve the reduction of Co3O4, but had less impact on TOF in contrast to Ru-free Co/SiO2catalyst.