Tuning selectivity in low-temperature Fischer-Tropsch synthesis by applying gas recycle mode
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This chapter contains sections titled: Basics of Fischer–Tropsch Chemistry and BTL Cobalt Fischer–Tropsch Catalysis Fischer–Tropsch Reactors Biomass Pretreatment and Gasification Biomass-to-Liquids Process Concepts BTL Pilot and Demonstration Plants XTL Energy and Carbon Efficiencies BTL Summary and Outlook References
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Abstract Die thermische Zersetzung des Eisencarbonyls Fe 3 (CO) 12 an Magnesiumoxidoberflächen im Vakuum führt zu Clusterverbindungen mit nul1wertigem Eisen.
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A mechanically agitated slurry reactor system was designed, built and operated to investigate the liquid phase methanol (LPMeOH{trademark}) synthesis process. In this reactor system, syngas reacts in the presence of the methanol synthesis catalyst (Cu/ZnO/Al{sub 2}O{sub 3}), which is slurried in the oil phase, and is thoroughly agitated by a mechanically driven impeller. Synthesis gas consisting of H{sub 2}, CO, CO{sub 2} and CH{sub 4} is mainly used as a feedstock in the synthesis of methanol. The sources of syngas for methanol synthesis have become very diverse, ranging from syngas obtained from Lurgi gasifiers (H{sub 2}-rich syngas), to syngas obtained from industrial gasifiers like Texaco and Koppers Totzek (CO-rich syngas). The effect of syngas composition, ranging from CO-rich to H{sub 2}-rich syngas, on the productivity of methanol was investigated. The development of a kinetic rate expression and the effect on equilibrium conversion, using H{sub 2}-rich syngas and CO-rich syngas, will be compared. These results will be of immense help in the modeling of the reactor system, and assist in the design, development, and scale-up of the LPMeOH process.
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硅石，氧化铝，和活性炭支持了铁钴催化剂被早期的湿受精准备。这些催化剂被赌注， X 射线衍射(XRD ) ，和规划温度的减小(TPR ) 描绘了。为公司加氢在不同搬运人上支持的铁钴的活动和选择在 1.5 MPa 的条件下面被学习， 493 K， 630 h (? 1 ) ，并且 1.6 的 H2/CO 比率。结果显示这项活动， C4 olefin/(C4 olefin+C4 石蜡) 在 Fe-Co/SiO2， Fe-Co/AC1， Fe-Co/A12O3 和 Fe-Co/AC2 的顺序的比率，和 C5 olefin/(C5 olefin+C5 石蜡) 减少。Fe-Co/SiO2 的活动到达了最大值。TPR 的结果证明 Fe-Co/SiO2 催化剂，到某程度不同。XRD 模式证明 Fe-Co/SiO2 催化剂与其它显著地不同；它有二衍射峰。活跃尖晶石阶段与支持被相关。给词调音：Fischer-Tropsch；二金属的催化剂；铁；钴；支持；硅石；氧化铝；活性炭；syngas
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This paper examines the Fischer-Tropsch technology for the biomass-to-clean fuels scenario.A comparison of the activities,selectivities and lifetimes of iron and cobalt catalysts for Fischer-Tropsch synthesis is made.For the more severe conditions,iron is the more active catalyst,whereas a cobalt catalyst may be more active at low severity conditions.In spite of many reports,there are still considerable differences in defining catalyst activity.The selectivity for methane likewise shows a wide range of reported results.Under the proper conditions,both catalysts are capable of operating for 6 months or more.
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