pH-CONTROLLED SYNTHESIS OF Co/SiO2 SOL-GEL CATALYSTS FOR FISCHER-TROPSCH SYNTHESIS
IntroductionFTS with conventional supported cobalt catalysts usually yields a wide spectrum of hydrocarbons which is controlled by the Anderson Schulz-Flory (ASF) polymerization kinetics 1. It imposes a limitation on the maximum selectivity for a given hydrocarbon product, such as C5-C18 paraffins (middle distillates) as they are believed to have extremely low sulfur and aromatic contents, high cetane index, and clean burning feature in compression-ignition engines 2. In order to overcome the limitation of ASF distribution, many studies have been made to explore an effective catalyst with controlled product selectivity 3-4. The sol-gel method is a preferred approach in the preparation of multi-component catalytic materials due to its ability to improve homogeneity, stability, surface area and porosity of the multi-component systems 5. Edward et al. Observed that the preparation of the xerogel supported cobalt catalyst by sol-gel method could favor synthesis of diesel rang hydrocarbons via tuning the porosity of catalysts 6. Recently, in our group, Co/SiO2 catalysts were prepared with the modification of chelating agent ethylenediamine (en) during the sol-gel process, which showed the higher selectivity to C5-C18 hydrocarbons. However, the effect of ethylenediamine during the sol-gel process has not been clearly understood yet. It was suggested that not only the coordination process between ethylenediamine and Co2+, but also the interaction of en and silica surface charges, were responsible for the final reducibility of Co species, pore structures and a concomitant catalytic performances of those catalysts.
Yuelun Wang Jiangang Chen Bo Hou Yuhan Sun
State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiy State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiy
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
231-232
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）